Upcoming Releases

​v0.31.0​

After scheduled transactions was made available in previewnet, we listened to user feedback and further iterated on the design to make it easier to use. This release adds support for this revised scheduled transactions design planned to be released in HAPI v0.13. There was no impact to our REST API format, only the importer needed to be updated to parse and ingest the new proto format. Our monitor API and acceptance tests will be adjusted in the next release once the SDKs add support for the new design.

This release also adds support for the newly announced account balance file format that was released in HAPI v0.12. The new protobufbased format will eventually replace the CSV format in July 2021. Until then, both formats will exist simultaneously in the bucket so users can transition at their leisure. Besides being more efficient to parse, the new files are also compressed using Gzip for reduced storage and download costs. We also took the time to improve the balance file parsing performance regardless of format. Average parse times should decrease by about 27%.

For our REST API, we now expose an entity_id field on our transactions related APIs. This field represents that main entity associated with that transaction type. For example, if it was a HCS transaction it would be the topic ID created, updated, or deleted.

GET /api/v1/transactions/0.0.1009-1234567890-999999998

{
  "transactions": [{
    "consensus_timestamp": "1234567890.999999999",
    "entity_id": "0.0.108763",
    "valid_start_timestamp": "1234567890.999999998",
    "charged_tx_fee": 0,
    "memo_base64": null,
    "result": "SUCCESS",
    "scheduled": false,
    "transaction_hash": "aGFzaA==",
    "name": "CRYPTOUPDATEACCOUNT",
    "node": "0.0.3",
    "transaction_id": "0.0.1009-1234567890-999999998",
    "valid_duration_seconds": "11",
    "max_fee": "33",
    "transfers": []
  }]
}

We continue to make progress towards our goal of switching to TimescaleDB. We fixed the user and database initialization issues and tested a migration from PostgreSQL. We switched out the TimescaleDB Helm chart to a more stable one and explored our hosting options for production. Finally we switched to SCRAM-SHA-256 to improve the security of our database user authentication.

Breaking changes:

There were a number of breaking changes this release to be aware of. If you're using our Helm chart, we have switched the importer from a StatefulSet to a Deployment since it no longer has the need for a persistent volume. We also switched the Traefik dependency from a Deployment to a DaemonSet. Both of these will require manual intervention to delete the old workload before upgrading. Support for Helm 2 was dropped since it is no longer supported by the community after November 13, 2020. If you're directly reading from our database, a rename of the t_entities table and its columns may impact you as well.

​v0.30.0​

Mirror node v0.30 brings operational improvements with changes to our continuous integration and monitoring components.

With this release, we've completed the migration from CircleCI to GitHub Actions. CircleCI had some limitations with our use of Testcontainers for unit testing against 3rd party dependencies. We previously had a mixture of GitHub Actions and CircleCI with the latter using slightly different commands than local testing. Consolidating to GitHub Actions allowed us to reduce this difference and further parallelize our checks.

To improve our runtime observability and testing coverage, we've continued to invest in our monitor tool this cycle. Scheduled transaction support was recently added supporting both ScheduleCreate and ScheduleSign operations. We've added the three new mainnet nodes the monitor's default configuration. A bug with the monitor unable to reach expected TPS with multiple scenarios was fixed.

The REST API also saw some bug fixes including a fix to queries with a credit/debit parameter now able to retrieve token only transfers. The transaction API now populates the token transfers list for all transaction types instead of being limited to just crypto transfers.

Latest Releases

​v0.29.1​

This release brings an assortment of under the hood improvements across modules and refinements of multiple REST API's.

Historical entity information prior to OA is now available. In this release we've added a repeatable Java migration that will import entity information from a mainnet network snapshot. This runs during upgrade, is configureable (hedera.mirror.importer.importHistoricalAccountInfo) and works in combination with the hedera.mirror.importer.startDatesetting.

The REST API now expands its filtering options support specifically around transfers and in relation to tokens. Previously the account.idand credit/debit filtering options supported HBAR transfers only, this release expands both filters to include tokens also.

The stateproof REST API and check-state-proof package have also been improved. The API now supports filtering for scheduled transactions via /api/v1/transactions/:transactionId/stateproof?scheduled=true as-well as a more compact response format. For record streams that utilize the newer improved HAPI v5 version the stateproof API response send back metadata hashes instead of the full raw bytes. With this, the response is more light weight.

 {
     "address_books": [
       "address book content"
     ],
     "record_file": {
       "head": "content of the head",
       "start_running_hash_object": "content of the start running hash object",
       "hashes_before": [
         "hash of the 1st record stream object",
         "hash of the 2nd record stream object",
         "hash of the (m-1)th record stream object"
       ],
       "record_stream_object": "content of the mth record stream object",
       "hashes_after": [
         "hash of the (m+1)th record stream object",
         "hash of the (m+2)th record stream object",
         "hash of the nth record stream object"
       ],
       "end_running_hash_object": "content of the end running hash object",
     },
     "signature_files": {
       "0.0.3": "signature file content of node 0.0.3",
       "0.0.4": "signature file content of node 0.0.4",
       "0.0.n": "signature file content of node 0.0.n"
     },
     "version": 5
 }

The REST API now also supports repeatable account.id query parameters when filtering, with a configureable setting for the maximum number of repeated query parameters /api/v1/(accounts|balances|transactions)?account.id=:id&account.id=:id2...

GET /api/v1/accounts?account.id=0.0.7&account.id=0.0.9

{
     "accounts": [
       {
         "balance": {
           "timestamp": "0.000002345",
           "balance": 70,
           "tokens": [
             {
               "token_id": "0.0.100001",
               "balance": 7
             },
             {
               "token_id": "0.0.100002",
               "balance": 77
             }
           ]
         },
         "account": "0.0.7",
         "expiry_timestamp": null,
         "auto_renew_period": null,
         "key": null,
         "deleted": false
       },
       {
         "balance": {
           "timestamp": "0.000002345",
           "balance": 90,
           "tokens": []
         },
         "account": "0.0.9",
         "expiry_timestamp": null,
         "auto_renew_period": null,
         "key": null,
         "deleted": false
       }
     ],
     "links": {
       "next": null
     }
   }

Multiple modules have also seen security and standardization improvements by the addition of more robust automated analysis tools such as gosec as-well as the implementation of suggestions from a 3rd party code audit.

This release also saw a step to support the new and improved v2 offerings of the (Java SDK)[https://github.com/hashgraph/hedera-sdk-java]. Both the monitor module and acceptance tests were updated to use the new SDK and utilize features such as in-built retry and support for scheduled transactions.

​v0.28.2​

This releases finalizes support for scheduled transactions and HAPI protobuf v0.12. Two new schedule specific REST APIs were added including /api/v1/schedules and /api/v1/schedules/:id. The former lists all schedules with various filtering options available and the latter returns a specific schedule by its schedule ID.

GET /api/v1/schedules?account.id=0.0.1024&schedule.id=gte:4000&order=desc&limit=10

{
    "schedules": [
      {
        "admin_key": {
          "_type": "ProtobufEncoded",
          "key": "7b2233222c2233222c2233227d"
        },
        "consensus_timestamp": "1234567890.000030003",
        "creator_account_id": "0.0.1024",
        "executed_timestamp": null,
        "memo": "Created per governing council decision dated 02/03/21",
        "payer_account_id": "0.0.1024",
        "schedule_id": "0.0.4000",
        "signatures": [
          {
            "consensus_timestamp": "1234567890.000030001",
            "public_key_prefix": "CQkJ",
            "signature": "CQkJ"
          }
        ],
        "transaction_body": "AQECAgMD"
      }
    ],
    "links": {
      "next": null
    }
}

In HAPI v0.12, new memo fields were added to all entity types bringing parity across all services. Mirror node now supports the new fields including for update operations where the memo field can be set to null, empty string or a non-empty string to keep, clear or replace the existing memo, respectively.

Historically, the importer application has always downloaded stream files and saved to the filesystem in one thread then read those files and ingested them into the database in another thread. This has sometimes caused the database and filesystem to get out of sync and require manual intervention to fix. It also makes the importer stateful and as a result could not support running multiple instances for high availability.

With this release, we've removed the need for importer to read and write to the filesystem. Instead, the downloader and parser threads now communicate via an in-memory queue. To accomplish this, we also had to remove the t_application_status table in favor of calculating the last successful file directly from the stream file tables. In addition to fixing the aforementioned issues, the removal of the filesystem has resulted in a 5% latency improvement.

Other changes include adding an index field to record_file table to simulate a blockchain index and updating our Google Marketplace to v0.27. Also, we added support for the v5 stream files to the check-state-proof client app.

​0.27.0​

This release adds a new REST API component that implements the Rosetta API. The Rosetta API is an open standard for integrating with blockchain-oriented systems. Implementing the Rosetta AP provides a number of advantages. It reduces the time and effort it takes for wallets, exchanges, etc. to integrate with the Hedera network if they have integrated with Rosetta in the past. Even if the systems integrator has not used Rosetta previously, using the Rosetta API in lieu of our separate REST API might be useful to reduce the friction with using a non-blockchain DLT like Hedera.

​Scheduled transactions is an new feature being added to the main nodes in a future release. Scheduled transactions allows transactions to be submitted without all the necessary signatures and will execute once all the required parties sign. The mirror node has been updated to understand and store these new types of transactions. Additionally, we've updated our existing REST APIs to expose this information. The next release will add additional schedule specific REST APIs.

We made a concerted effort this release to improve our tests. Most of our flaky tests were fixed so that our continuous integration runs smoother. We also improved the stability of our acceptance tests. The REST API monitor also had some logging and useability fixes to aid in production observability.

​v0.26.0​

This release is mainly focused on adding support for the upcoming features in the main nodes. We added support for the newTotalSupply field to the transaction record in HAPI 0.10.0. We also documented our design for the upcoming scheduled transactions services that's coming in a future release of HAPI. Our next minor version will have preliminary support for that.

But by far the biggest change is support for the new record file V5 and signature file V5 format. These files are uploaded to cloud storage and pulled by the mirror nodes to populate its database. Since it's the core communication format between the main nodes and mirror nodes, it took a bit of refactoring and new code to support the new format while retaining compatibility with previous stream files.

Warning! If you don't upgrade your Mirror Node to v0.26.0 or later before HAPI v0.11.0 is released in a few weeks, your mirror node will be unable to process new transactions.

We continued our progress on switching to TimescaleDB. We integrated a TimescaleDB helm chart into our Kubernetes deployment and added migration scripts to convert from PostgreSQL to TimescaleDB. We're still in the testing phase so it's still recommended to stick with the v1 schema (the default) for now.

​v0.25.0​

This release saw a slew of enhancements to our new monitoring module. The monitor is a standalone component that can publish and subscribe to transactions from various Hedera APIs to gauge the health of the system. New in this release is the ability to automatically create entities on startup using a new expression syntax. This is useful to avoid boilerplate configuration and manual entity creation steps that vary per environment.

A sample percentage property was added to the monitor to control how often the REST API should be verified. We took the time to properly document the monitor tool detailing its configuration and operational steps. Finally, we added a number of new metrics and a Grafana dashboard to view them.

We made progress towards our goal of replacing PostgreSQL with TimescaleDB. This release contains the initial database migrations to setup the mirror node from scratch using TimescaleDB. These migrations are hidden behind a feature flag. In an upcoming release we'll add further functionality including data migration scripts and Helm support.

​v0.24.0​

This release adds OpenAPI 3.0 specification support to our REST API. The OpenAPI specification is available at /api/v1/openapi.ymland serves as a formal specification of our API. Clients can use the specification to shorten the amount of time it takes to integrate with our API by generating code or tests harnesses. It also provides us with a new auto-generated API documentation site viewable at /api/v1/docs.

We now have support for the AWS Default Credential Provider Chain. Now instead of only being able to provide static access and secret keys in the configuration, you can rely on the default provider chain to retrieve your credentials automatically from the environment (environment variables, ~/.aws/credentials, etc). See our documentation for more information.

We've enhanced our monitoring tools to provide greater observability into the mirror node's operation. In addition to publishing, our monitor tool now supports subscribing to the gRPC and REST APIs to verify end to end functionality of Hedera. It will also generate metrics off this information. We take advantage of Loki's new log alerting capability and now can alert off of any errors we see in logs that might be cause for concern.

​v0.23.0​

This release focuses on finalizing our support for the new Hedera Token Service (HTS) provided by the Hedera API v0.9.0. There are no new HTS features, just various fixes to make it compatible with the latest protobuf. HTS is currently enabled in previewnet and should be enabled in testnet very soon, so please try it out and let us know if you have any feedback.

A new Helm chart was added to run the monitor application. The monitor is still under heavy development so stay tuned.

Most of the other changes were bug fixes. We now use SonarCloud to scan for vulnerabilities and bugs and have addressed all the major items. You can view our SonarCloud dashboard to track our progress. Entities are now only inserted for successful transactions and we fixed the wrong address book being updated. There were multiple issues with the state proof alpha API that were resolved. For the gRPC API, we improved its performance and lowered its CPU usage. Also related to gRPC, we now enable server sent keep alive messages and permit a lower client sent keep alive messages of 90 seconds, which should hopefully address timeout issues that some users have reported.

​v0.22.0​

This release continues our improvements to our Kubernetes support as well as monitoring and performance improvements across the modules.

We improved our custom PrometheusRule alerts for the Importer, GRPC and REST API modules, as well as added dashboards for our gRPC and REST API modules. Additionally, we increased our pod resources limits to optimize Importer ingestion and gRPC streaming performance in a Kubernetes cluster. Our existing js based monitor and REST performance tests were both updated to include HTS support.

We also improved our data generator module with support for the majority of HAPI transactions the mirror node importer ingests. Additionally, we also added a java based monitor module that supports generation and publishing of transactions.

This release also includes an improvements to avoid the stale account info bug that stems from balance stream files being received at a slower frequency than record stream files. Now account creations and account info changes will be reflected in REST API call even though the updated balance may not have been received. We also extended our REST API support to include case insensitive support query parameters. /api/v1/transactions?transactionType=tokentransfers and /api/v1/transactions?transactiontype=tokentransfers are now both acceptable.

​v0.21.0​

This release continues our focus on the Hedera Token Service (HTS) by adding three new token REST APIs. A token discovery REST API /api/v1/tokens shows available tokens on the network. A token REST API /api/v1/tokens/${tokenId} shows details for a token on the network. A token supply distribution REST API /api/v1/tokens/${tokenId}/balances shows token distribution across accounts. These APIs have already made their way to previewnet so check them out!

Continuing our HTS theme, we enhanced our testing frameworks with token support. Our acceptance tests can send HTS transactions to HAPI and wait for those transactions to show up via the mirror node REST API. Additionally, our performance tests can simulate a HTS load to test how the system responds to HTS transactions.

We improved our existing REST APIs by adding a way to filter by transaction type. When searching for transactions or showing the transactions for a particular account you can now filter via an optional transactionType query parameter. This feature can be used with the transactions API in the format /api/v1/transactions?transactionType=tokentransfers while the format for the accounts API is /api/v1/accounts/0.0.8?transactionType=TOKENTRANSFERS.

We improved our Kubernetes support with AlertManager integration. There are now custom PrometheusRule alerts for each component that trigger notifications based upon Prometheus metrics. A custom Grafana dashboard was created that shows currently firing alerts.

​v0.20.0​

This is a big release that contains support for a new HAPI service and whole new runtime component to dramatically improve performance. Due to the magnitude of the changes, it did take us a little longer to mark it as generally available as we wanted to ensure it was tested as much as possible beforehand.

First up is support for the Hedera Token Service (HTS) that was recently announced and rolled out to previewnet. A lot of work was put into supporting the new transaction types on the parser side including enhancing the schema with new tables and ingesting them via the record stream. HTS also required a new balance file version that adds token information to the CSV. Token information is now returned for our existing REST APIs while the next release will contain token specific REST APIs for further granularity. Check it out in previewnet and let us know if you have any feedback!

We made a lot of strides in improving the ingestion performance in previous releases, but since we also wanted to ensure low end to end HCS latency via our gRPC API we had to sacrifice some of that speed. As a result, we could only ingest at about 3,000 transactions per second (TPS) before latency spiked above 10 seconds. This was entirely due to our use of PostgreSQL notify/listen to notify the gRPC API of new data.

In this release, we add a new notification mechanism without sacrificing speed or latency with our support for Redis pub/sub. With Redis, the mirror node can now ingest at least 10,000 TPS while still remaining under 10 seconds from submitting the topic message and receiving it back via the mirror node's streaming API. Redis is enabled by default, but it can be turned off if HCS latency is not a concern and you want to avoid another runtime dependency.

We also added support for the HAPI protobuf changes that are coming in v0.9.0. The protobuf is removing two deprecated fields while adding a new signedTransactionBytes field. Since the mirror node still needs to support historical transactions we retain support for parsing transactions that contain the old payload format.

​v0.19.0​

This release finishes the State Proof alpha REST API and makes it generally available. As part of this, we made a lot of improvements to the check-state-proof command line tool that queries the API and validates the files locally. We also now store the node account used to verify record file, ensuring greater accuracy as to the provenance of the state proof.

There's been some changes to the public Hedera environments lately and we've updated the mirror node to reflect that. We added support for the new previewnet environment and we updated the configuration to point to the new testnet bucket after its recent reset. Please ensure your mirror node has all of the data in the previous bucket before updating to this release, assuming you're not specifying the bucket name manually.

We added proper liveness and readiness probe endpoints for all our components. If you're not familiar with the concept of liveness and readiness probes, check out the Kubernetes documentation on the subject. Our new liveness endpoint now does not fail if external dependencies are down like the database, ensuring the application doesn't restart unnecessarily. Even if you're not using Kubernetes it would be worthwhile to look into to ensure your mirror node is using the appropriate endpoint for health checks, based upon your needs.

​v0.18.2​

Fix two regressions in the 0.18 release train.

​v0.18.1​

Contains a small change to the State Proof Alpha REST API to only return the current address book for now.

​v0.18.0​

Building upon the availability of the State Proof Alpha REST API in the last release, we've added sample code in JavaScript to retrieve the state proof from a mirror node and locally verify it. This allows users to obtain cryptographic proof that a particular transaction took place on Hedera. The validity of the proof can be checked independently to ensure that the supermajority of Hedera mainnet stake had reached consensus on that transaction. Similar to the promise of the ultimate state proofs, the user can trust this state proof alpha served by the mirror nodes, even when the user does not trust the mirror nodes.

Importer can now be configured to connect to Amazon S3 using temporary security credentials via AssumeRole. With this, a user that does not have permission to access an AWS resource can request a temporary role that will grant them that permission. See the configuration documentation for more information.

Importer also added two new properties to control the subset of data it should download and validate. The hedera.mirror.importer.startDate property can be used to exclude data from before this date and "fast-forward" to the point in time of interest. By default, the startDate will be set to the current time so mirror node operators can get up and running quicker with the latest data and reduce cloud storage retrieval costs. Note that this property only applies on the importer's first startup and can't be changed after that. The hedera.mirror.importer.endDate property can be used to exclude data after this date and halt the importer. By default it is set to a date far in the future so it will effectively never stop.

Breaking Changes

The aforementioned startDate property does change how the mirror node operators on initial start from previous releases. By defaulting to now, users standing up a new mirror node will no longer retrieve all historical data and will instead only retrieve the latest data. Current users upgrading to this release will not be affected even if their data ingest is not fully caught up since this property only applies if the database is empty like it is on first start. To revert to the previous behavior, a date in the past can be specified like the Unix epoch 1970-01-01T00:00:00Z.

​v0.17.3​

This release contains the port of a bug fix to better manage the VertxException: Thread blocked issue seen in #945​

​v0.17.2​

A small bug fix to better support resetting the mirror node when a stream reset is performed on the network environment

​v0.17.1​

A small fix to correct a performance regression with not properly caching a heavily used query.

​v0.17.0​

This release adds support for the storage of the network address books from file 0.0.101 and 0.0.102in the mirror node database. The mirror node will now retrieve file address book contents which include node identifiers and their public keys from the database instead of the file system at startup.

This sets the stage for an additional feature which is the State Proof alpha REST API at /transactions/${transactionId}/stateproof. With this release it is possible to request the address book, record file and signature files that contain the contents of a transaction and allow for cryptographic verification of the transaction. Mirror node users can now actively verify submitted transactions for themselves.

Other changes include support for continuous deployment (CD) using Github Actions that use FluxCD to deploy master versions to a Kubernetes cluster. Additionally, this release includes fixes to the database copy operation optimization and improved handling of buffer size used when copying large topic messages.

​v0.16.0​

This release includes the foundation for some larger features to come. Notably, cloud bucket names are now set based on network specifications and users no longer need to explicitly state bucket names for demo, test and main networks. The record_file table contents are also expanded to include the start and end consensus timestamps of their containing transactions. The record_file table also saw a clean up to remove the path to the file.

Additionally, this release streamlines the helm chart architecture with a common chart for shared resources. It also adds dependabot to facilitate dependency update management. The parser was also update to handle signature files across multiple time bucket groups for greater parsing robustness.

Memory improvements were also made in the parser to improve ingestion performance. Due to performance pg notify was also removed in favor of direct psql notify to support faster streaming of incoming topic messages.

​v0.15.3​

Works around an issue sending large JSON payloads via pg_notify by ignoring them for now. This occurs when a consensus message is sent with a message that exceeds 5824 bytes, which is also very close to the protobuf limit.

​v0.15.2​

This release improves the topic message ingest rate that regressed in the previous release. This is just a stop gap and future releases will increase this further.

​v0.15.1​

A hot fix release to address two high priority parsing errors with the new consensus message chunk header.

​v0.15.0​

This release adds support for HCS topic fragmentation that will soon be rolled out to main nodes in the 0.6.0 release. For larger consensus messages that don't fit in the max transaction size of 6144 bytes, a standard chunk info header can be supplied to indicate how that message should be split into smaller messages. The Mirror Node now understands this chunk information and stores it in the database. Additionally, it will return this data when subscribing to the topic via the gRPC API. The Java SDK is being updated to automatically split and reconstruct this message as appropriate.

Other changes include optimizations around end to end latency of the gRPC API. This was accomplished mainly by adding a new NotifyingTopicListener that uses PostgreSQL's LISTEN/NOTIFY functionality.

​v0.14.1​

This release further optimizes the ingestion rate. Initial tests indicate a 2x to 3x improvement.

​v0.14.0​

This release is all about performance optimizations. We reworked some of the foreign keys to improve the ingestion performance by a few thousand transactions per second. We also fixed an out of memory issue with the gRPC API and did some optimizations in that area.

Besides performance, we made some other small improvements. We now set topicRunningHashV2AddedTimestamp with a default value for mainnet, making it not fail on startup if a value is not provided. Containerized acceptance and performance tests were added, making it easier to test at scale.

Breaking Changes

We removed hedera.mirror.grpc.listener.bufferInitial and hedera.mirror.grpc.listener.bufferSize properties since we removed the shared poller's buffer.

We also renamed some tables and columns which would affect you if you directly use the database structure. We renamed t_transactions to transaction, t_cryptotransferlists to crypto_transfer and non_fee_transfers to non_fee_transfer.

​v0.13.2​

Bug fix release to fix an out of memory issue with the gRPC API.

​v0.13.1​

Small bug fix release to address grpc NETTY issue blocking acceptance tests

​v0.13.0​

This release is a smaller release mainly focused on bug fixes with some minor enhancements. We added a new property hedera.mirror.importer.downloader.endpointOverride for testing. We also added hedera.mirror.importer.downloader.gcpProjectId to support specifying requester pays credentials with a personal account. Finally, we improved our Marketplace support getting us one closer to making it available.

​v0.12.0​

This feature release contains a few nice additions while fixing a few critical bugs. We made good progress on adding our application to Google Cloud Platform Marketplace. This should be wrapping up soon and enable a "one click to deploy" of the mirror node to Google's Cloud. Additionally, some extra fields were added to our APIs. We added runningHashVersion to the REST and GRPC APIs. Finally, we added transactionHash to the transaction REST API.

We improved the importer ingestion rate from 3400 to 5600 transactions per second in our performance test environment. There's still room for improvement and we plan on making additional performance optimizations in an upcoming release.

Breaking Changes

We added an option to keep signature files after verification. By default, we no longer store signatures on the filesystem. If you'd like to restore the old behavior and keep the signatures, you can set hedera.mirror.importer.downloader.record.keepSignatures=true and hedera.mirror.importer.downloader.balance.keepSignatures=true.

We changed the bypass hash mismatch behavior in this release. Bypassing hash mismatch could be used in combination with other parameters to fast forward mirror node to newer data or to overcome stream resets. Previously you had to specify this via a database value in t_application_status. Since this data is not application state but considered more a user supplied value, we added a new property hedera.mirror.importer.verfiyHashAfter=2020-06-05T17:16:00.384877454Z for this purpose.

​v0.11.0

This release was mainly focused on refactoring code and properties as a necessary step for future enhancements. We also continued making improvements to our Kubernetes support. To that end, we added Prometheus REST metrics, Helm tests and Mirror Node can now run in GKE.

We added a new parameter to all of the topic related REST APIs to return a topic message in plaintext instead of binary. Messages submitted to HAPI are submitted as binary and stored in the Mirror Node that way as well. If you know the messages are actually strings encoded in UTF-8, then you can set encoding=utf-8and the REST API will make a best effort conversion to string. By default or if you pass a query parameter of encoding=base64, it will return the message as base64 encoded binary.

Breaking Changes

Please note when upgrading that we made major breaking changes to the naming of our configuration properties. We've renamed all hedera.mirror.api properties to hedera.mirror.rest. We also renamed the properties apiUsername to restUsername and apiPassword to restPassword to reflect that as well. Any properties that were used by the importer module were renamed to be nested under hedera.mirror.importer. We apologize for any inconvenience.

We've removed the hedera.mirror.addressBookPath property in favor of a hedera.mirror.importer.initialAddressBook property. The former was overloaded to be both the initial bootstrap address book and the live address book being updated by file transactions for 0.0.102. The live address book is now hardcoded to ${hedera.mirror.importer.dataPath}/addressbook.bin and cannot be changed.

The REST API to retrieve a topic message by its consensus timestamp now supports both a plural (/topics/messages/:consensusTimestamp) and singular (/topic/message/:consensusTimestamp) URI path. The singular format is deprecated and will be going away in the near future, so please update to the plural format soon.

We removed the singular form of a few alpha topic REST APIs. The /topic/:id/message API was removed in favor of the plural form /topics/:id/messages. Similarly, the /topic/:id/message/:sequencenumberAPI was removed in favor of its plural form /topics/:id/messages/:sequencenumber. Please update accordingly.

​v0.10.1​

Small bug fix release to address a REST API packaging issue.

​v0.10.0​

In preparation for Hedera Node release 0.5.0, we're releasing v0.10.0 to support the latest version of HAPI. The changes include renaming Claims to LiveHash and new response codes. One important HAPI change is the addition of a topicRunningHashVersion to the transaction record. This change was necessary as the way the topic running hash is changing with the release of 0.5.0. As a result, the Hedera Mirror Node added this new field to its database and a migration is ran to populate it with either the new or old version depending upon the release date of 0.5.0.

Unfortunately, this necessitated adding a required field hedera.mirror.topicRunningHashV2AddedTimestamp to control this behavior and will fail on startup if this is not populated. This is just a temporary measure. Once Hedera Node 0.5.0 is released to testnet and mainnet we will update this so it's automatically populated with the known date.

Other changes include adding Google PubSub support to publish JSON representing the Transaction and TransactionRecord protobuf to a message queue for external consumption. We've also added REST API metrics and added Traefik as an API gateway for our helm chart.

Breaking changes

We've had to remove our event stream support. This area of the code was never enabled and was untested and was incurring technical debt without providing any benefit. If it becomes necessary in the future, we can re-add it within our newly refactored framework.

The new /api/v1/topics/:id alpha REST API that was added in 0.9 has been changed to /api/v1/topics/:id/messages. This change was made to align the API with the other topic message APIs as it refers to the messages entity and not the topic entity.

​v0.9.1​

Small bug fix release to address not being able to handle address book updates that span multiple transactions.

​v0.9.0​

This release contains another new REST API for our consensus service. You can now retrieve all topic messages in a particular topic, with additional filtering by sequence number and consensus timestamp. Here's an example:

GET /api/v1/topic/7?sequencenumber=gt:2&timestamp=lte:1234567890.000000006&limit=2

{
  "messages": [
    {
      "consensus_timestamp": "1234567890.000000003",
      "topic_id": "0.0.7",
      "message": "bWVzc2FnZQ==",
      "running_hash": "cnVubmluZ19oYXNo",
      "sequence_number": 3
    },
    {
      "consensus_timestamp": "1234567890.000000004",
      "topic_id": "0.0.7",
      "message": "bWVzc2FnZQ==",
      "running_hash": "cnVubmluZ19oYXNo",
      "sequence_number": 4
    }
  ],
  "links": {
     "next": "/api/v1/topic/7?sequencenumber=gt:2&timestamp=lte:1234567890.000000006&timestamp=gt:1234567890.000000004&limit=2"
  }
}

The other big feature of this release is Kubernetes support. We've create a Helm chart that can be used to deploy a highly available Mirror Node with a single command. This feature is still under heavy development as we work towards converting our current deployments to this new approach.

​v0.8.1​

Small bug fix release to fix a packaging issue.

​v0.8.0​

Mirror node v0.8.0 is here! We're made great strides in making the mirror node easier to run and manage. In particular, we added support for requester pays buckets. This will allow anyone to run a mirror node as long as they are willing to pay for the cost to retrieve the data. Currently only Hedera and a few partners have access to the bucket, so enabling this will open up that data to our community. We are still working on a migration of the buckets to this model, so stay tuned.

We also added two new experimental REST APIs to retrieve HCS data. Firstly, we added /api/v1/topic/message/${consensusTimestamp} to retrieve a topic message by its consensus timestamp. Secondly, we added /api/v1/topic/${topic}/message/${seqNum} to retrieve a particular topic message by its sequence number from a topic. These APIs are considered alpha and may changed or be removed in the future. We also dramatically increased test coverage for the REST APIs and squashed some bugs in the process.

For our GRPC API, we had to switch from R2DBC to Hibernate to reach the scale and stability that we needed. In doing so, we can now support a lot more concurrent subscribers at a higher throughput. It should also finally put to rest any stability concerns with the GRPC component.

There are a few breaking changes that we had to make. We now no longer write and store record or balance files to the filesystem after they are inserted into the database. If you still need these files, you can set hedera.mirror.parser.balance.keepFiles and hedera.mirror.parser.record.keepFiles to true.

Also, we moved the persist properties to be grouped under a new path. That is we moved options like hedera.mirror.parser.record.persistTransactionBytes to hedera.mirror.parser.record.persist.transactionBytes. Please update your local configuration accordingly.

​v0.7.0​

0.7.0 focuses on refactoring the record file parsing to decouple the parsing from the persisting of data. This refactoring is laying the groundwork for additional performance improvements and allowing additional downstream components to register for notification of the transactions.

​

​v0.6.0​

• Release focused on stability and performance improvements.

• End to end test coverage.

This release was mainly focused on enhancing the stability and performance of the mirror node. We improved the transaction ingestion speed from 600 to about 4000 transactions per second. At the same time, we greatly improved the resiliency and performance of the GRPC module. We also added acceptance tests to test out HCS end to end.

Breaking Change

Please note that one potentially breaking change in this release is to reject subscriptions to topics that don't exist. This avoids the server having to poll repeatedly until it is created and taking up resources for a topic that may never exist. It is expected that clients or the SDK will poll periodically after creating a topic until that topic makes its way to the mirror node. This functionality is hidden behind a feature flag but will slowly be rolled out over the next month.

v0.5.3

• Now supports all HCS functionality including a streaming gRPC API for message topic subscription.

• Changed how the mirror node verifies mainnet consensus. Mirror node now waits for at least third of node signatures rather than greater than two thirds to verify consensus.

• Added new mainnet nodes to the mirror node address book.

• Access still restricted to a white listed set of IP addresses. Request access here.

• Please see the Mirror Node releases page for the full list of changes here.

• We occasionally may encounter a situation where an additional 15-20 second delay in message round trip time is experienced and subscriber connections are dropped. No messages are lost, and the consensus time is not affected. Clients are encouraged to reconnect. This issue will be fixed in a subsequent release of the Hedera mirror node. Some third-party mirror nodes should not be affected by this issue. We also don't expect it to impact the exchanges using the REST end point for the mirror node.