IoTDB/RELEASE_NOTES.md

Apache IoTDB (incubating) 0.9.0

New Features

• IOTDB-143 Compaction of data file
• IOTDB-151 Support number format in timeseries path
• IOTDB-158 Add metrics web service
• IOTDB-173 Add batch write interface in session
• IoTDB-174 Add interfaces for querying device or timeseries number
• IOTDB-187 Enable to choose storage in local file system or HDFS
• IOTDB-188 Delete storage group
• IOTDB-193 Create schema automatically when inserting
• IOTDB-198 Add sync module (Sync TsFiles between IoTDB instances)
• IOTDB-199 Add a log visualization tool
• IOTDB-203 Add "group by device" function for narrow table display
• IOTDB-205 Support storage-group-level Time To Live (TTL)
• IOTDB-208 Add Bloom filter in TsFile
• IOTDB-223 Add a TsFile sketch tool
• IoTDB-226 Hive-TsFile connector
• IOTDB-239 Add interface for showing devices
• IOTDB-241 Add query and non query interface in session
• IOTDB-249 Enable lowercase in create_timeseries sql
• IOTDB-253 Support time expression
• IOTDB-259 Level query of path
• IOTDB-282 Add "show version"
• IOTDB-294 Online upgrade from 0.8.0 to 0.9.0
• Spark-iotdb-connector
• Support quoted measurement name
• Generate cpp, go, and python thrift files under service-rpc
• Display cache hit rate through jconsole
• Support inserting data that time < 0
• Add interface (Delete timeseries) in session
• Add a tool to print tsfileResources (each device's start and end time)
• Support watermark feature
• Add micro and nano timestamp precision

Incompatible changes

• RPC is incompatible, you can not use client-0.8.0 to connect with server-0.9.0 or use client-0.9.0 to connect with server-0.8.0.
• Server is backward compatible, server-0.9.0 could run on data folder of 0.8.0. The data file will be upgraded background.
• Change map key in TsDigest from String to enum data type

Miscellaneous changes

• IOTDB-144 Meta data cache for query
• IOTDB-153 Further limit fetchSize to speed up LIMIT&OFFSET query
• IOTDB-160 External sort
• IOTDB-161 Add ErrorCode of different response errors
• IOTDB-180 Get rid of JSON format in "show timeseries"
• IOTDB-192 Improvement for LRUCache
• IOTDB-210 One else if branch will never be reached in the method optimize of ExpressionOptimizer
• IOTDB-215 Update TsFile sketch tool and TsFile docs for v0.9.0
• IOTDB-221 Add a python client example
• IOTDB-233 keep metadata plan clear
• IOTDB-251 Improve TSQueryDataSet structure in RPC
• IOTDB-257 Makes the client stop fetch when dataSize equals maxPrintRowCount and change client fetchSize less than maxPrintRowCount
• IOTDB-258 Add documents for Query History Visualization Tool and Shared Storage Architecture
• IOTDB-265 Re-adjust the threshold size of memtable
• IOTDB-267 Reduce IO operations in deserializing chunk header
• IOTDB-273 Parallel recovery
• IOTDB-276 Fix inconsistent ways of judging whether a Field is null
• IOTDB-285 Duplicate fields in EngineDataSetWithoutValueFilter.java
• IOTDB-287 Restrict users to only use domain names and IP addresses.
• IOTDB-293 Variable naming convention
• IOTDB-295 Refactor db.exception
• Reconstruct Antlr3 grammar to improve performance
• Tooling for release
• Modified Decoder and SequenceReader to support old version of TsFile
• Remove jdk constrain of jdk8 and 11
• Modify print function in AbstractClient
• Avoid second execution of parseSQLToPhysicalPlan in executeStatement

Known Issues

• IOTDB-20 Need to support UPDATE

Bug Fixes

• IOTDB-168&169 Fix a bug in export-csv tool and fix compatibility of timestamp formats in exportCsv, client display and sql
• IOTDB-174 Fix querying timeseries interface cannot make a query by the specified path prefix
• IOTDB-195 Using String.getBytes(utf-9).length to replace string.length() in ChunkGroupMetadata for supporting Chinese
• IOTDB-211 Use "%IOTDB_HOME%\lib*" to refers to all .jar files in the directory in start-server.bat
• IOTDB-240 Fix unknown time series in where clause
• IOTDB-244 Fix bug when querying with duplicated columns
• IOTDB-252 Add/fix shell and bat for TsFileSketchTool/TsFileResourcePrinter
• IOTDB-266 NullPoint exception when reading not existed devices using ReadOnlyTsFile
• IOTDB-264 Restart failure due to WAL replay error
• IOTDB-290 Bug about threadlocal field in TSServiceImpl.java
• IOTDB-291 Statement close operation may cause the whole connection's resource to be released
• IOTDB-296 Fix error when skip page data in sequence reader
• IOTDB-301 Bug Fix: executing "count nodes root" in client gets "Msg:3"
• Fix Dynamic Config when Creating Existing SG or Time-series
• Fix start-walchecker scripts for letting user define the wal folder
• Fix start script to set JAVA_HOME

Apache IoTDB (incubating) 0.8.1

This is a bug-fix version of 0.8.0

• IOTDB-172 Bug in updating startTime and endTime in TsFileResource
• IOTDB-195 Bug about 'serializedSize' in ChunkGroupMetaData.java (for Chinese string)
• IOTDB-202 fix tsfile example data type
• IOTDB-242 fix mvn integration-test failed because the files in the target folder changes
• Abnormal publishing of sequence and unsequence data folders in DirectoryManager
• Fix a bug in TimeRange's intersects function

Apache IoTDB (incubating) 0.8.0

This is the first official release of Apache IoTDB after joining the Incubator.

New Features

• IOTDB-1 Add Aggregation query
• IOTDB-4 Asynchronously force sync WAL periodically
• IOTDB-5 Support data deletion
• IOTDB-11 Support start script for jdk 11 on Windows OS
• IOTDB-18 Improve startup script compatible for jdk11
• IOTDB-36 [TsFile] Enable recover data from a incomplete TsFile and continue to write
• IOTDB-37 Add WAL check tool script
• IOTDB-51 Update post-back module to synchronization module
• IOTDB-59 Support GroupBy query
• IOTDB-60 Support Fill function when query
• IOTDB-73 Add REGULAR encoding method for data with fixed frequency
• IOTDB-80 Support custom export file name
• IOTDB-81 Update travis for supporting JDK11 on Windows
• IOTDB-83 Add process bar for import script and show how many rows have been exported
• IOTDB-91 Improve tsfile-spark-connector to support spark-2.4.3
• IOTDB-93 IoTDB Calcite integration
• IOTDB-109 Support appending data at the end of a completed TsFile
• IOTDB-122 Add prepared statement in JDBC
• IOTDB-123 Add documents in Chinese
• IOTDB-130 Dynamic parameters adapter
• IOTDB-134 Add default parameter for client starting script
• Add read-only mode of IoTDB
• New storage engine with asynchronously flush and close data file
• Adding english documents
• Supporting travis + window + jdk8
• Add skipping all UTs: maven integration-test -DskipUTS=true
• Enable users define the location of their thrift compiler
• Add example module
• Add a log appender: put info, warn, error log into one file and disable log_info by default
• Recover when resource file does not exist while tsfile is complete

Incompatible changes

If you use the previous unofficial version 0.7.0. It is incompatible with 0.8.0.

Miscellaneous changes

• IOTDB-21 Add ChunkGroup offset information in ChunkGroupMetaData
• IOTDB-25 Add some introduction for JMX MBean Monitor in user guide
• IOTDB-29 Multiple Exceptions when reading empty measurements from TsFileSequenceReader
• IOTDB-39 Add auto repair functionality for RestorableTsFileIOWriter
• IOTDB-45 Update the license in IoTDB
• IOTDB-56 Faster getSortedTimeValuePairList() of Memtable
• IOTDB-62 Change log level from error to debug in SQL parser
• IoTDB-63 Use TsFileInput instead of FileChannel as the input parameter of some functions
• IOTDB-76 Reformat MManager.getMetadataInString() in JSON format
• IOTDB-78 Make unsequence file format more similar with TsFile
• IOTDB-95 Keep stack trace when logging or throwing an exception
• IOTDB-117 Add sync documents
• Modify ASF header for each file and add related maven plugin
• Add IoTDB env script test
• Add sync function for jdbc server to close
• Add cache directories for download jars and sonar plugin of maven in travis
• Add partition start and end offset constraints when loading ChunkGroupMetaData
• Check when creating Storage group
• Try to release memory asap in ReadOnlyMemChunk
• Add more physical plan serializer
• Move all generated tsfiles for test into the target folder
• Make TsFileWriter as AutoClosable
• Print apache-rat violation result on console
• Update multi dir avoid disk is full
• Simplify Path construction
• Separate documents into different chapter folders
• Suppress mvn log in travis
• Add mvn -B in travis

Known Issues

• IOTDB-20 Need to support UPDATE
• IOTDB-124 Lost timeseries info after restart IoTDB
• IOTDB-125 [potential] a concurrency conflict may occur when a delete command and insertion command appears concurrently
• IOTDB-126 IoTDB will not be closed immediately after run 'stop-server.sh' script
• IOTDB-127 Chinese version documents problems

Bug Fixes

• IOTDB-2 Maven Test failed before run mvn package -Dmaven.test.skip=true
• IOTDB-7 OpenFileNumUtilTest failed
• IOTDB-15 Fail to install IoTDB on Ubuntu 14.04
• IOTDB-16 Invalid link on https://iotdb.apache.org/#/Documents/Quick Start
• IOTDB-17 Need to update chapter Start of https://iotdb.apache.org/#/Documents/Quick Start
• IOTDB-18 IoTDB startup script does not work on openjdk11
• IOTDB-19 Fail to start start-server.sh script on Ubuntu 14.04/Ubuntu 16.04
• IOTDB-22 BUG in TsFileSequenceReader when reading tsfile
• IOTDB-24 DELETION error after restart a server
• IOTDB-26 Return error when quit client
• IOTDB-27 Delete error message
• IOTDB-30 Flush timeseries cause select to returns "Msg:null"
• IOTDB-31 Cannot set float number precision
• IOTDB-34 Invalid message for show storage group
• IOTDB-44 Error message in server log when select timeseries
• IOTDB-49 Authorizer module outputs too many debug log info
• IOTDB-50 DataSetWithoutTimeGenerator's initHeap behaves wrongly
• IOTDB-52 Cli doesn't support aggregate
• IOTDB-54 Predicates doesn't take effect
• IOTDB-67 ValueDecoder reading new page bug
• IOTDB-70 Disconnect from server when logging in fails
• IOTDB-71 Improve readPositionInfo
• IOTDB-74 THe damaged log will be skipped if it is the only log
• IOTDB-79 Long term test failed because of the version control of deletion function
• IOTDB-81 Fix Windows OS environment for Travis-CI
• IOTDB-82 File not closed in PageHeaderTest and cause UT on Windows fails
• IOTDB-84 Out-of-memory bug
• IOTDB-94 IoTDB failed to start client since the required jars are not in the right folder
• IOTDB-96 The JDBC interface throws an exception when executing the SQL statement "list user"
• IOTDB-99 List privileges User on cannot be used properly
• IOTDB-100 Return error message while executing sum aggregation query
• IOTDB-103 Does not give a hint when encountering unsupported data types
• IOTDB-104 MManager is incorrectly recovered when system reboots
• IOTDB-108 Mistakes in documents
• IOTDB-110 Cli inserts data normally even if there is no space left on the disk
• IOTDB-118 When the disk space is full, the storage group is created successfully
• IOTDB-121 A bug of query on value columns
• IOTDB-128 Probably a bug in iotdb official website
• IOTDB-129 A bug in restoring incomplete tsfile when system restart
• IOTDB-131 IoTDB-Grafana module error when getting the timeseries list from Grafana
• IOTDB-133 Some content is mistaken for links
• System memory check failure in iotdb-env.sh
• Time zone bug in different region
• DateTimeUtilsTest UT bug
• Problem discovered by Sonar
• Openjdk11 + linux11 does not work on travis
• Start JDBC service too slowly
• JDBC cannot be closed
• Close bug in sync thread
• Bug in MManager to get all file names of a path
• Version files of different storage groups are placed into the same place
• Import/export csv script bug
• Log level and stack print in test
• Bug in TsFile-Spark-Connector
• A doc bug of QuickStart.md