Release Notes

Features

• Remove unused/duplicate reconnect code #25320 by @akugal
• cleanup/improve MerkelDB tests #25452 by @akugal
• 25370 Add continuity check to apply-blocks command #25448 by @imalygin
• 25301 Added support for the rate limiter to apply-blocks command #25363 by @imalygin
• 25222: HalfDiskHashMap to write object key buckets in parallel on multiple threads #25281 by @artemananiev
• Refactor batch transaction rollback handling #25174 by @lukasz-hashgraph
• Align record files with signed states #25234 by @derektriley
• migrate protobuf parsing to parseStrict and add test coverage #25273 by @viniciusjssouza
• 25299 : Relax state validator to accept VirtualMapState snapshots #25300 by @imalygin
• extract root node exchange from reconnect tasks #25242 by @akugal
• 24999: improve lifecycle in swirlds-benchmarks #25038 by @thenswan
• Execute block stream cutover logic #24227 by @mhess-swl
• Replace validation slack_report.json with validation_errors.txt #23355
• Tighten jumpstart migration conditions #24986 by @mhess-swl
• HAPI tests and DSL verbs for WRB streaming #24958 by @aderevets
• Change tipset algorithm to use event sequence number instead of NGen #24991 by @abies
• Async delete leaves out of range during reconnect #25123 by @akugal
• route wrapped record block items through GrpcBlockItemWriter #24889 by @aderevets
• 24875 Compaction - consolidation tasks to decrease small file count #25071 by @imalygin
• 23294: re-enable async snapshot optimization #24202 by @thenswan
• Extract reconnect logic from VirtualMap. #24662 by @akugal
• New Ad hoc Solo Tests Workflow and WRB migration test #24904 by @derektriley
• 25043: Remove redundant Main class from swirlds-benchmarks #25044 by @thenswan
• Standalone Fee Calculator improvements #24791 by @joshmarinacci
• Add event sequence number managed in orphan buffer #24937 by @abies
• Add support for remote SSH network for Sloth testing #24834 by @timo0

Bug Fixes

• [0.75 CP 02/12] cherry-pick (0.75): Refactor access list encoding #26379 by @aderevets
• [0.75 CP 01/12] cherry-pick (0.75): signSchedule(address,bytes) signatureMap size limit #26387 by @aderevets
• cherry-pick: Add BlockRecordManager.Lifecycle for streamMode=RECORDS #25755 by @derektriley
• cherry-pick: Allow multiple WRB Jumpstarts #25752 by @derektriley
• cherry-pick: WRB BlockHeader.blockTimestamp incorrectly set to blockCreationTime instead of first consensus timestamp #25750 by @derektriley
• NPE on null chainId #25279 #25466 by @0x-ds, @gkozyryatskyy
• handle happyPathWithoutReuseForAtomicBatch flake #25440 by @Grigorov-Georgi
• silence JVM warnings in Solo Latitude JAVA_OPTS #25456 by @aderevets
• use parse not parseStrict for block nodes config #25455 by @aderevets
• 25445: LongListDisk temp directories are not cleaned up #25446 by @thenswan
• 25374: Reduce object allocations in VirtualHasher by not serializing leaf values #25411 by @artemananiev
• 25239 silence-jvm-warnings-in-consensus-node #25287 by @aderevets
• generate signing key for :app:run so node boots past key loading #25342 by @aderevets
• 25417: CryptoBench reports stray running threads, deletes its data directory unconditionally #25438 by @thenswan
• delete snapshot dir on detach #25409 by @akugal
• 25163 surface precheck status when yahcli sysfile upload fails #25209 by @aderevets
• 25365 Added missing PathsConfig #25366 by @imalygin
• propagate transactionOffsetNanos through platform-sdk consensus timestamp chain #25250 by @Jeffrey-morgan34
• 25327 Filter compactionInProgress files in coordinator phase 1 filtering #25329 by @imalygin
• Make sure to restore connectivity after starting the otter node #25260 by @abies
• restore log output by bundling a dedicated log4j2 config #25131 by @Chinnmay
• 25277: LongListDisk is not thread safe #25280 by @artemananiev
• Resolve Failing BN XTS regression panel #24879 by @Nana-EC
• Simultaneous merge #25252 by @tinker-michaelj
• 25171: Async snapshot intermittent failures #25189 by @thenswan
• 25225 Fix race condition in EntityIdUniquenessValidator #25226 by @imalygin
• 25204 Fix race condition in file assignment and reduce consolidation aggressiveness #25216 by @imalygin
• 25162 silence yahcli JDK 25 warnings from protobuf and netty #25199 by @aderevets
• 25177: PBJ version update to 0.15.2 #25178 by @artemananiev
• do not increment the wanted block when BlockNodeStatus#latestBlockAvailable is -1 #25185 by @timfn-hg
• 25020 Registered missing ModulesConfig #25021 by @imalygin
• disable state.saveStateAsync for restart/reconnect HAPI tests #25153 by @AlexKehayov
• Improve conditional for charging custom fees surcharge in Token Create #25017 by @joshmarinacci
• stabilize node reward HAPI tests by forcing block boundaries before state mutations #24971 by @viniciusjssouza
• signature requirements and other improvements (HIP-1299 and HIP-869) #25061 by @petreze
• streamsAreValid flake from incomplete next-block lookup #25097 by @AlexKehayov
• raise platform.wiring.healthLogThreshold to 5s for hapiTestRestart #25105 by @AlexKehayov
• override HAPI Restart maximumPermissibleUnhealthySeconds, broaden CI log globs #25085 by @AlexKehayov
• CannotDeleteSystemEntitiesSuite silent failures and hardcoded shard/realm #24739 by @JivkoKelchev
• set Atomic Batch CI runner to XL to avoid resource exhaustion #25079 by @AlexKehayov
• stabilize GetScheduledInfoTest non-existent schedule tests by using virtual time #25073 by @AlexKehayov
• use lenient stubs for race-dependent watchKey mocks in testConfigWatcher_randomError #25072 by @AlexKehayov
• prevent hollow account fuzzing test to fail due to stale account registry entries #25056 by @Evdokia-Georgieva
• isolate HAPI subtask logs into per-task subdirectories, regroup subtasks in sets of <30mins (#24888, #24880) by @AlexKehayov
• stabilize blck001...004ReturnsCorrectBlockProperties by not deferring first call's status #25031 by @AlexKehayov
• ensure xfersScenario transfers reach consensus before record assertion #25057 by @AlexKehayov
• 25065 Decrease log level for CompactionV3 log statements #25066 by @imalygin
• ignore recoverable WRAPS signing retry warning in log validator #25063 by @Evdokia-Georgieva
• failing transactionOpsDurationMetricsAreRecordedAndRetrieved test #25055 by @Grigorov-Georgi
• stabilize failToUpdateNFTsMetadataWithEmptySerialNumbers by using virtual time #25058 by @AlexKehayov
• skip previous txn ids in ValidContractIdsAssertion #25030 by @petreze
• stabilize irreversiblePrecedingItemsAsExpected by flushing stream before watcher registers #25027 by @Evdokia-Georgieva
• Reduce noisy logs in the connection monitor when the detected changes are unchanged #25036 by @timfn-hg
• charge NFT rate if amount == 0 AND metadata is not empty. #25014 by @joshmarinacci
• Fix flaky OS Entropy Check Test by increasing timeout #25037 by @poulok
• Stabilize fridayThe13thSpec by deferring expiry to execution time #25026 by @Evdokia-Georgieva
• increase expiry offset to deal with the timing issue under load #24993 by @Grigorov-Georgi

Other Changes

Build System

• bump org.assertj:assertj-core from 3.27.3 to 3.27.7 in /hiero-dependency-versions #23910 by @dependabot[bot]
• bump com.github.spotbugs:spotbugs-annotations from 4.9.3 to 4.9.8 in /hiero-dependency-versions #23793 by @dependabot[bot]
• add -PrunUntilFailure= to check tests for flakiness #25257 by @jjohannes

Chores

• Apply changes from #26072 to release/0.75 #26078 by @rbarker-dev
• previewnet jumpstart application.properties #25882 by @derektriley
• Testnet jumpstart application properties and remove previewnet #25792 by @derektriley
• Update BlockRecordStreamConfig writeWrappedRecordFileBlockHashesToDisk #25737 by @derektriley
• previewnet jumpstart properties #25708 by @derektriley
• cherry-pick: fix of SDLT Latency metrics NLG 0.14.3 #25624 by @derektriley
• cherry-pick: Enable WRB Streaming in MATS and Update Block Node version #25564 by @derektriley
• (0.75) Update Mainnet throttles for CryptoGetAccountBalanceQuery #25586 by @derektriley
• Create v0.75.0 BlockRecordSchema with migration #25507 #25534 by @derektriley
• (0.75) Wait for proofs + ACKs for pending blocks in freeze onSealConsensusRound() #25537 by @tinker-michaelj
• Only log when a slow or stalled BN connection is detected #25488 #25563 by @timfn-hg
• Adopt TSS lib 3.8.1 #25392 by @tinker-michaelj
• Reduce block timestamp selection to first event or round timestamps #25217 by @mhess-swl
• Disable hooks by default #25406 by @tinker-michaelj
• Cleanup consensus-pces-impl dependencies #25362 by @poulok
• bump grpc from 1.73.0 to 1.81.0 in /hiero-dependency-versions #23888 by @dependabot[bot]
• Update ingest parse metrics #25262 by @derektriley
• ThrottleAccumulator ContractID getAssociationCount #25418 by @derektriley
• Keep creating events when FREEZING until all blocks are signed #25268 by @tinker-michaelj
• Add record file running hash validator #25368 by @derektriley
• bump gradle-wrapper from 9.3.1 to 9.5.0 #25278 by @dependabot[bot]
• Remove blockStream.enableStateProofs config #25364 by @derektriley
• fix codeowners expression for 'HAPI Build Files' #25387 by @jjohannes
• Clean up remaining swirlds-common dependencies #25286 by @netopyr
• Add test coverage for new transaction offset #25338 by @poulok
• Clean up dependencies of hashgraph-impl tests #25285 by @netopyr
• Replace LegacyTemporaryFileBuilder with FileSystemManager #25292 by @poulok
• add dashboard for Node Rewards monitoring #25303 by @viniciusjssouza
• clean up test dependencies of gossip-impl #25274 by @netopyr
• Update max size for sending messages to the block node to be 125 MB #25275 by @timfn-hg
• Move unit tests to their respective modules #25259 by @netopyr
• 25136: Adjust run config in swirlds-benchmarks #25149 by @thenswan
• fix test dependencies in event stream module #25231 by @netopyr
• List-of-RSA-signatures for WRBs #25179 by @tinker-michaelj
• remove internal package in consensus-concurrent module #25238 by @netopyr
• Increase VirtualLeafBytes parse max size #24951 by @derektriley
• 25223: A typo in DataFileReader when allocating local read buffers #25224 by @artemananiev
• Various quality of life changes around CN <-> BN communication #25203 by @timfn-hg
• extract event stream writer #25187 by @netopyr
• Update test constructor invocation to fix compile error #25198 by @mhess-swl
• Update HederaEvmTransaction mapping #25145 by @lukasz-hashgraph
• Fix (AccountID, TokenID) field order in block stream StateChanges #25172 by @tinker-michaelj
• Write consensus snapshot to disk in saved state directory #25068 by @poulok
• move swirlds common unit tests #25173 by @netopyr
• Minor Version Roll to 0.75.0-SNAPSHOT
• Enhance BN connection observability and block selection on start #25092 by @timfn-hg
• 25110 Added reference doc for the signed snapshot format #25120 by @imalygin
• cleanup consensus state dependencies #25165 by @netopyr
• Move MockAppender #25166 by @netopyr
• Move Mnemonics to crypto module #25158 by @netopyr
• move crypto functionality to crypto module #25137 by @netopyr
• Add BinaryStateChangesValidator #24982 by @tinker-michaelj
• Make FeeAccumulator defensive, clamp hook gas limits #25022 by @tinker-michaelj
• Remove unused Chart class #25125 by @poulok
• Add swirlds log validation to HAPI tests #25034 by @poulok
• Be noisy if WRAPS enabled but artifact unavailable #24379 by @tinker-michaelj

Continuous Integration

• explictly declare java 25.0.2 #25529 by @andrewb1269
• update cancelled HAPI test processing in MATS #25401 by @andrewb1269
• consolidate find commit author slack into a script #25324 by @joshmarinacci
• revert flaky test rerun, processing, issue creation #25271 by @andrewb1269
• update trigger on unapprove PR workflow #25265 by @andrewb1269
• switch PR title check to step-security/action-semantic-pull-request #25220 by @nathanklick
• Fix typo in SDLT #25206 by @rbarker-dev
• Update MQPT for chewie json response #25099 by @rbarker-dev
• Update step-security and initialize-github-job #25127 by @rbarker-dev
• remove empty parens on xts cancelled slack message #25103 by @andrewb1269
• Add read chewie response logic to sdlt #25091 by @rbarker-dev
• Update adhoc SDPT to use the chewie values #25086 by @rbarker-dev
• update docs to reflect compile and spotless job #25050 by @andrewb1269
• combine compile and spotless into a single job #25035 by @andrewb1269
• Update language on slack reports and categories to use environment #25029 by @rbarker-dev

Documentation Updates

• document runUntilFailure parameter for flaky test investigation #25321 by @viniciusjssouza
• Add PCES snapshot coordination ADR doc #25304 by @poulok
• Initial draft of consensus knowledge base #25310 by @netopyr
• forbid AI origin/attribution markers in repo content #25221 by @nathanklick

Performance Improvements

• getCode() without a copy. #24981 by @cliffclick

Refactoring

• Move recycle bin to consensus-utility #25341 by @poulok
• Move FileSystemManager, simplify configuration #25218 by @poulok
• 25249 Refactor BlockStreamRecoveryWorkflow to use BinaryState #25256 by @imalygin
• 25243 Refactor BinaryStateChangesValidator to use BinaryState #25244 by @imalygin
• Move FileUtils #25213 by @poulok
• Extract gui module #25062 by @poulok

Tests

• cherry-pick: update CITR to Solo 0.76 #25714 #25719 #25881 by @alex-kuzmin-hg
• cherry-picked 25128 to 0.75: reapply latency metrics in nlg (25128) #25190 #25653 by @alex-kuzmin-hg
• update NLG to 0.14.1 (25407) #25410 by @alex-kuzmin-hg
• fix TPS EMA in CryptoBench #25372 by @OlegMazurov
• Use pre-cutover state changes in binary replay #25311 by @mhess-swl
• Add Github workflow for WRB streaming tests with solo #25138 by @ibankov
• to fix missed mc utility (25181) #25182 by @alex-kuzmin-hg
• fix flaky com.hedera.services.bdd.suites.blocknode.BlockNodeBackPressureSuite#backPressureAllNodesCheckingScenario tes #25104 by @aderevets
• use max K8S CPUs for perf tests (25024) #25069 by @alex-kuzmin-hg