Features & Improvements

• [IOTDB-6029] Implementing flink-sql-iotdb-connector
• [IOTDB-6084] Pipe: support node-urls in connector-v1
• [IOTDB-6103] Adding count_time aggregation feature
• [IOTDB-6112] Limit & Offset push down doesn't take effect while there exist time filter
• [IOTDB-6115] Limit & Offset push down doesn't take effect while there exist null value
• [IOTDB-6120] push down limit/offset in query with group by time
• [IOTDB-6129] ConfigNode restarts without relying on Seed-ConfigNode
• [IOTDB-6131] Iotdb rest service supports insertRecords function
• [IOTDB-6151] Move DataNode's system.properties to upper dir
• [IOTDB-6173] Change default encoder of INT32 and INT64 from RLE to TS_2DIFF
• Adjust the default thrift timeout parameter to 60s
• Accelerate the deletion execution

Bugs

• [IOTDB-6064] Pipe: Fix deadlock in rolling back procedures concurrently
• [IOTDB-6081] Pipe: use HybridExtractor instead of LogExtractor when realtime mode is set to log to avoid OOM under heavy insertion load
• [IOTDB-6145] Pipe: can not release TsFile or WAL resource after pipe is dropped
• [IOTDB-6146] Pipe: can not transfer data after 1000+ pipes' creating and dropping
• [IOTDB-6082] Improve disk space metrics
• [IOTDB-6104] tmp directory won't be cleaned after udf query end
• [IOTDB-6119] Add ConfigNode leader service check
• [IOTDB-6125] Fix DataPartition allocation bug when insert big batch data
• [IOTDB-6127] Pipe: buffered events in processor stage can not be consumed by connector
• [IOTDB-6132] CrossSpaceCompaction: The estimated memory size is too large for cross space compaction task
• [IOTDB-6133] NullPointerException occurs in unsequence InnerSpaceCompactionTask
• [IOTDB-6148] Pipe: Fixed the bug that some uncommited progresses may be reported
• [IOTDB-6156] Fixed TConfiguration invalidly in Thrift AsyncServer For IoTConsensus
• [IOTDB-6164] Can create illegal path through rest api
• Fix datanode status is ReadOnly because the disk is full
• Fix DataPartition allocation bug when insert big batch
• Fix flush point statistics
• Fix SchemaFileSketchTool is not found
• Refactoring DeleteOutdatedFileTask in WalNode
• Add compression and encoding type check for FastCompactionPerformer
• Add lazy page reader for aligned page reader to avoid huge memory cost when reading rows of aligned timeseries
• Pipe: use PipeTaskCoordinatorLock instead of ReentrantLock for multi thread sync
• Pipe: fix pipe procedure stuck because of data node async request forever waiting for response
• Pipe: fix NPE when HybridProgressIndex.updateToMinimumIsAfterProgressIndex after system reboot (DR: SimpleConsensus)
• Pipe: fix pipe coordinator deadlock causing CN election timeout
• Pipe: Improve performance for 10000+ pipes
• RATIS-1873. Remove RetryCache assertion that doesn't hold

Full Changelog: https://github.com/apache/iotdb/compare/v1.2.1...v1.2.2