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Posted to commits@iotdb.apache.org by ha...@apache.org on 2023/03/25 05:14:28 UTC
svn commit: r60817 [2/2] - in /dev/iotdb/1.1.0: ./ rc1/
Added: dev/iotdb/1.1.0/rc1/RELEASE_NOTES.md
==============================================================================
--- dev/iotdb/1.1.0/rc1/RELEASE_NOTES.md (added)
+++ dev/iotdb/1.1.0/rc1/RELEASE_NOTES.md Sat Mar 25 05:14:27 2023
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+<!--
+
+ Licensed to the Apache Software Foundation (ASF) under one
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+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
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+ Unless required by applicable law or agreed to in writing,
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+ KIND, either express or implied. See the License for the
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+-->
+
+# Apache IoTDB 1.0.0
+
+## New Features
+
+* New architecture that supports standalone and cluster mode with two types of nodes: ConfigNode, DataNode
+* Support ConfigNode management: Start/Add, Stop, Remove
+* Support DataNode management: Start/Add, Stop, Remove
+* Support replication of ConfigNode, Schema and Data
+* Support Consensus Protocol: Simple, IoT, Ratis
+* Support Cluster management sql: show cluster, show regions
+* Support administration in Cluster: User, Permission, Role management
+* Support authorization when login and executing a command
+* Support create/show/count/delete database
+* Support show/count devices
+* Support create/show/count timeseries
+* Support schema template management
+* Support MPP(massively parallel process) framework in cluster
+* Support insertion, deletion and all query types in Cluster
+* Support CSV import/export tools
+* Support TsFile import/export tools
+* Support Sync TsFile from an IoTDB with one replica to another with any replica number
+* Support UDF framework in Cluster
+* Support new UDF 'change_points
+* Support stateful, stateless Trigger in Cluster
+* Support Select into in Cluster
+* Support Continuous Query in Cluster
+* Support flush on local/cluster
+* Support clear cache on local/cluster
+* Support metric for DataNode and ConfigNode with output to IoTDB, Prometheus, and JMX
+* Support DBAPI in python client
+* Support RestApi, MQTT for cluster
+* Support having clause and between expression in query
+* Support order by timeseries in last query
+* Support hot configuration of data_dirs
+
+# Apache IoTDB 0.13.3
+
+## Improvements
+
+* [IOTDB-4525] Accelerate restart process
+* [IOTDB-3164] Add compaction memory control
+* [IOTDB-4364] Reduce read amplification in compaction
+* [IOTDB-4424] Specify error message when time value of insert sql can not be correctly parsed
+* [IOTDB-4492] Control total file size of cross space compaction task
+* [IOTDB-4542] Optimize schema validate error message
+* Optimize pattern matching in Regexp
+
+## Bug Fixes
+
+* [IOTDB-3988] Fix reload problem of metric module and refactor metric module
+* [IOTDB-4239] fix NPE to insert a null value into a TEXT timeseries
+* [IOTDB-4318] Fix RESTAPI data type conversion failed
+* [IOTDB-4320] Fix insert row with null cause recover throw NPE
+* [IOTDB-4343] Fix NPE when using MQTT protocol
+* [IOTDB-4357] fix start in windows, IOTDB_LOG_DIR_IS_UNDEFINED folder appears
+* [IOTDB-4585] Incorrect query result after deleting data for aligned timeseries
+* [IOTDB-4615] TTL adapts timestamp precision
+* [IOTDB-4636] IndexOutOfBoundsException when compacting aligned series
+* Fix PathAlreadyExistException during concurrent auto creating aligned timeseries
+
+# Apache IoTDB 0.13.2
+
+## Improvements
+
+[IOTDB-2669] Improve C++ client insertTablet performance
+[IOTDB-3087] enlarge default value of avg_series_point_number_threshold
+[IOTDB-3861] Enable insert null values in Session
+[IOTDB-3996] REST API nonQuery support Continuous Query
+[IOTDB-4120] Optimize memory allocation of Expression
+[IOTDB-4190] update documents about nifi-iotdb-bundle
+REST support "select into" in nonQuery API
+Import-CSV supports specify data type and no need quotation for text value
+
+## Bug Fixes
+
+[IOTDB-2736] DELETE_STORAGE_GROUP can not be granted to user (reporting 401)
+[IOTDB-2760] Ordinary users do not grant any permissions, but can still show operations
+[IOTDB-2769] Fix auth mapping of GRANT_ROLE_PRIVILEGE and GRANT_USER_ROLE
+[IOTDB-3302] Without any authorization, ordinary users still have the right to query other user information
+[IOTDB-4023] The C++ interface query result returns records error
+[IOTDB-4047] Query NPE after change device alignment
+[IOTDB-4096] Fix the names of metric pushed to Prometheus are inconsistency in micrometer and dropwizard
+[IOTDB-4194] IOException happened in Compaction
+[IOTDB-4215] Fix incorrect aggregate query results due to wrong unseq file traversal order
+[IOTDB-4216] Fix execute create aligned timeseries but a non-aligned timeseries created
+[IOTDB-4222] DeadLock when concurrently deleting and creating storage groups
+[ISSUE-6774] Connection error when using DataGrip with JDBC driver
+[ISSUE-6937] After restart, the aligned series turns to non-aligned
+[ISSUE-6987] Fix select error when selecting a single quotation mark
+
+# Apache IoTDB 0.13.1
+
+## New Features
+
+* [IOTDB-2602] "Without null" supports filtering based on partial columns
+* [IOTDB-3873] Aligned timeseries support single point fill query
+* [ISSUE-6171] Support createTimeseriesOfTemplate in Session
+* [IOTDB-3742] Support COUNT NODES by root.**
+
+## Improvements
+
+* [IOTDB-2820] Update UserGuide SQL about Trigger
+* [IOTDB-2837] Add check and sort for NumpyTablet to make sure timestamps are ordered
+* [IOTDB-2838] Check and auto correct endian type for NumpyTablet
+* [IOTDB-2873] provide json template for grafana
+* [IOTDB-2888] Unary expression can followed by a constant
+* [IOTDB-3747] Default Paging of Schema Query with limit 10000
+* [IOTDB-3797] Print detailed info in session when connection fails
+* [IOTDB-3851] C++ client method of tablet sorting optimization
+* [IOTDB-3879] Modify document about the Programming-Cpp-Native-API
+* [IOTDB-3901] C++ client method of insertRecordsOfOneDevice sorting optimization
+
+## Bug Fixes
+
+* [IOTDB-2753] Insert a time series with a null value and report 500
+* [IOTDB-2759] Result of "Show paths set schema template" or "using template" is not complete
+* [IOTDB-2775] Fix throwing exception when query non-exist device in TsFileSequenceReader
+* [IOTDB-2787] Fix aligned mem chunk concurrent problem
+* [IOTDB-2826] Fix can not drop schema template
+* [IOTDB-2828] Update system_version in system.properties after upgrading
+* [IOTDB-2835] Fix empty page in selfcheck method of TsFileSequenceReader
+* [IOTDB-2837] Add check and sort for NumpyTablet to make sure timestamps are ordered
+* [IOTDB-2852] The import-csv tool can not import the data to nonaligned device
+* [IOTDB-2859] Fix python tablet with None value is incorrect
+* [IOTDB-2862] Fix SQL injection risks of grafana-connector
+* [IOTDB-2864] Fix Read-only occurred when insert Text value to aligned timeseries
+* [IOTDB-2882] Fix unary expression display bug
+* [IOTDB-2902] Handling user privileges for aligned timeseries related features
+* [IOTDB-2903] Fix show latest timeseries result does not sorted by time
+* [IOTDB-2910] Fix count result not right after deleting storage group
+* [IOTDB-2915] MLogTxtWriter error while parsing CreateAlignedTimeseriesPlan
+* [IOTDB-2922] Fix NPE when compacting with files that contains zero device
+* [IOTDB-2924] UDF Framework: index overflow while iterating sliding windows
+* [IOTDB-2983] Serialization error in Partial insert
+* [IOTDB-2999] Remove useless config and fix default value error.
+* [IOTDB-3018] Fix compaction bugs on handling deleted target file
+* [IOTDB-3029] The prefix path generated by the select into target sequence contains * and ** currently unchecked
+* [IOTDB-3045] The query result contains some timeseries that have been deleted
+* [IOTDB-3120] Print the tsfile name when meet IOException
+* [IOTDB-3158] Fix NPE exception when use iotdb-reporter
+* [IOTDB-3160] TsFile will be corrupted when flushing memtable appears OOM
+* [IOTDB-3168] Forbid the path with * could be inserted
+* [IOTDB-3171] Fix NPE when getting modification file
+* [IOTDB-3219] Fix stop-server on windows
+* [IOTDB-3247] Recover aligned sensors after deleting timeseries, query lost data
+* [IOTDB-3301] Tag recover bug after IoTDB server restart
+* [IOTDB-3364] Fix Query stucked with null valued aligned timeseries bug
+* [IOTDB-3420] Fix show paths set schema template t1 error
+* [IOTDB-3494] Fix TypeError in py-session
+* [IOTDB-3523] Fix the count and COUNT not equal bug when querying with group by level
+* [IOTDB-3645] Fix use statistics bug in aggregation query
+* [IOTDB-3651] Stop compaction schedule when all compaction is disable
+* [IOTDB-3709] Fix a loop occurred in TsFileResourceList, causing the query to fail and oom occurs
+* [IOTDB-3730] Fix ArrayIndexOutOfBounds when flushing a memtable
+* [IOTDB-3795] Remove setting read-only when handling compaction exception
+* [IOTDB-3803] failed to insert data of TEXT by session
+* [IOTDB-3816] Fix /zero bug in recover
+* [IOTDB-3822] Fix cross compaction overlap bug
+* [IOTDB-3826] Fix duplicate success when concurrent creating same timeseries
+* [IOTDB-3858] IndexOutOfBoundsException: bitIndex < 0
+* [ISSUE-5482] Fix Release zip files include incorrect version of Guava
+* [ISSUE-5773] Aggregation result is not complete
+* [ISSUE-5964] Fix bug of aligned timeseries time duplicated aggregation
+
+
+# Apache IoTDB 0.13.0
+
+## New Features
+
+* [IOTDB-924] Support insert multi rows in SQL
+* [IOTDB-959] Add Create Storage Group Grammar
+* [IOTDB-1037] set rpc\_compression as a parameter in JDBC URL
+* [IOTDB-1059] Support sql statement insert without timestamp
+* [IOTDB-1143] Support Continuous query
+* [IOTDB-1199] Support aligned timeseries and schema template
+* [IOTDB-1319] Support Trigger
+* [IOTDB-1391] Add a new Aggregation function extreme (max absolute value)
+* [IOTDB-1399] Add a session interface to connect multiple nodes
+* [IOTDB-1400] Support arithmetic operations in SELECT clauses
+* [IOTDB-1403] Dictionary encoding for TEXT
+* [IOTDB-1490] Add built-in UDTFs: sinh, conh, tanh
+* [IOTDB-1514] Support null in insertTablet
+* [IOTDB-1524] Support SELECT ... INTO ... clause
+* [IOTDB-1647] Nested Expressions in SELECT clauses
+* [IOTDB-1673] CLI upgrade to JLine3
+* [IOTDB-1739] Constant timeseries generating functions (const, pi and e)
+* [IOTDB-1760] Support avg, count, extreme, first\_value, last\_value, max\_time, max\_value, min\_time, min\_value, sum aggregations in group by fill
+* [IOTDB-1761] Add metric framework for IoTDB
+* [IOTDB-1775] Add CAST function to convert data type
+* [IOTDB-1823] Support group by multi level
+* [IOTDB-1844] Query support timeseries prefix and suffix matching: root.\*sg\*
+* [IOTDB-1859] Support REST API
+* [IOTDB-1860] New Grafana plugin
+* [IOTDB-1886] Support Constant Expressions in Select Clauses
+* [IOTDB-1973] Supports aggregate queries, constants, and arithmetic nested expressions in SELECT clauses
+* [IOTDB-1986] Support select UDF as alisa clauses
+* [IOTDB-1989] Spark-IoTDB-connector support inserting data
+* [IOTDB-2131] Support previous, linear, constant value fill funtion New fill
+* [ISSUE-3811] Provide a data type column for the last query dataset
+* add rabbitmq example
+
+## Improvements
+
+* [IOTDB-1280] Rewrite the Antlr grammar file
+* [IOTDB-1372] Enhance management of TsFileResource
+* [IOTDB-1428] Ask query threads to quit if query is timeout
+* [IOTDB-1450] Deletion should only delete related time partitions
+* [IOTDB-1463] Implement builder pattern for Session and SessionPool
+* [IOTDB-1477] Optimize code logic of generateAlignByDevicePlan()
+* [IOTDB-1559] Refactor the IT framework
+* [IOTDB-1564] Make hearbeat and election timeout parameters be configurable
+* [IOTDB-1581] Consider deletions when recovering tsFileResource of incomplete tsfile
+* [IOTDB-1607] Optimize Tracing
+* [IOTDB-1613] Recover mods file if write modification failed
+* [IOTDB-1639] Refactoring the cluster class structure to make it consistent with the server module
+* [IOTDB-1730] client-cpp, enhance session::insertTablet() etc.'s performance
+* [IOTDB-1852] Accelerate queryies by using statistics
+* [IOTDB-1857] Remove useless handle logic for CountPlan in executeNonQuery in cluster module
+* [IOTDB-1884] Distinguish between zero and null values in sum aggregation
+* [IOTDB-1924] Remove the operation of clearing the cache after the compaction is over
+* [IOTDB-1950] Add Bloom Filter cache for query
+* [IOTDB-2001] Remove redundant StorageGroupNotReadyException
+* [IOTDB-2011] Update last cache while doing show latest timeseries query
+* [IOTDB-2022] SessionDataSet implements AutoCloseable
+* [IOTDB-2075] Accelerate the process of insertTablets by using thread pool
+* [IOTDB-2119] IoTDB CSV export tools add timestamp accuracy setting function
+* [IOTDB-2162] Simplify the recovery merge process
+* [IOTDB-2176] Limit target chunk size when performing inner space compaction
+* [IOTDB-2193] Reduce unnecessary lock operations of RaftLogManager to improve writing performance
+* [IOTDB-2195] Control the concurrent query execution thread
+* [IOTDB-2632] Set compaction_write_throughput_mb_per_sec to 16 by default
+* [ISSUE-3445] New compaction strategy and compaction scheduling strategy
+* [ISSUE-3856] refine exception handling logic in commitTo in RaftLogManager
+* [Cluster] No need to shake hands with itself when one node restart
+
+
+## Incompatible changes
+
+* [IOTDB-1026] Support wildcard \*\* in Path And Replace PrefixPath usage with PathPattern in IOTDB-SQL
+* [IOTDB-1620] Support backtick (\`) character and double quotes (") to quote identifiers
+* [IOTDB-1650] Rename the sql command `move` to `unload`
+
+## Miscellaneous changes
+
+* [IOTDB-1342] modify error message about LIMIT and OFFSET used in conjunction with the FILL clause
+* [IOTDB-1372] delete devices field in FileTimeIndex
+* [IOTDB-1531] Check tsfile creation time when recovering
+* [IOTDB-1541] Change sequence of wal and memtable in insertion
+* [IOTDB-1923] Separate the request unpacking and execution processing logic of TSServiceImpl
+* [IOTDB-1969] Remove statistic resources of old metric framework from iotdb-server
+* [IOTDB-2014] MicrometerPrometheusReporter#getReporterType return null
+* [IOTDB-2043] refactor: remove haveSorted param from Session
+* [IOTDB-2154] add TsFileUtils.isTsFileComplete
+* [IOTDB-2206] Rename StorageGroupProcessor to VirtualStorageGroupProcessor
+* [IOTDB-2208] Reconstruct the process of generating resultset header of query
+* [ISSUE-4047] Generic type in Statistics extend Serializable
+* Add compaction version in cache key
+* Add a constructor of IoTDBDescriptorHolder to prohibit instantiation
+
+## Bug Fixes
+
+* [IOTDB-1266] Fix SHOW TIMESERIES will only display 2000 timeseries
+* [IOTDB-1478] The whole IoTDB can not read/write if any one sg is not ready
+* [IOTDB-1562] Fix incorrect exception processing in insertXXX() API
+* [IOTDB-1583] Raft log failed to be committed in cluster version
+* [IOTDB-1592] BugFix: SLimit Not effective in align by device
+* [IOTDB-1736] Fix error code is not printed in TSServiceImpl's log
+* [IOTDB-1749] sync-tool's lockInstance() dose not take effect
+* [IOTDB-1758] sync-tool, empty uuid file cause tool can not auto-recovery
+* [IOTDB-1848] Failed to initialize pool: Does not support setReadOnly in grafana-connector
+* [IOTDB-1853] Fix bug about more than one TimeseriesMetadata in TsFile
+* [IOTDB-2010] fix incomplete show timeseries result
+* [IOTDB-2021] Fix Bloom Filter Cache doesn't take effect bug
+* [IOTDB-2060] Fix NPE when using fill without a filter
+* [IOTDB-2074] Fix NullPointerException when recovering compaction in MacOS
+* [IOTDB-2077] Unexpected exception when executing raw data query without VF with limit clause
+* [IOTDB-2088] Fix IndexOutOfBound exception in AggregationPlan.groupAggResultByLevel
+* [IOTDB-2116] Fix all client connections are stuck bug caused by logback bug
+* [IOTDB-2129] Wrong result returned when querying by nested expressions with aliases
+* [IOTDB-2143] fix wrong precision in cluster mode
+* [IOTDB-2153] [IOTDB-2157] fix incorrect path search space
+* [IOTDB-2159] Fix wrong status code when inserting data to a read-only cluster
+* [IOTDB-2163] Fix unexpected amount of columns in a cluster slimit query
+* [IOTDB-2174] Fix Regexp filter serializing and deserializing error
+* [IOTDB-2180] Fix show latest timeseries in cluster
+* [IOTDB-2183] Fix the config problems in cluster mode
+* [IOTDB-2185] Fix get an exception when parsing the header of CSV
+* [IOTDB-2209] Fix logback CVE-2021-42550 issue
+* [IOTDB-2251] [IOTDB-2252] Fix Query deadlock
+* [IOTDB-2267] UDF: Error code 500 caused by user logic
+* [IOTDB-2282] fix tag recovery bug after tag upsert
+* [IOTDB-2290] Fix Incorrect query result in C++ client
+* Fix CPP client could not be successfully built on windows
+* Fix dead lock in setDataTTL method
+
+
+# Apache IoTDB 0.12.5
+
+## New Features
+* [IOTDB-2078] Split large TsFile tool
+* [IOTDB-2192] Support extreme function
+
+## Improvements
+* [IOTDB-1297] Refactor the memory control when enabling time partitions
+* [IOTDB-2195] Control the concurrent query execution thread
+* [IOTDB-2475] Remove sg not ready log in batch process
+* [IOTDB-2502] Add query sql in error log if encountering exception
+* [IOTDB-2506] Refine the lock granularity of the aggregation query
+* [IOTDB-2534] add character support while using double quote
+* [IOTDB-2562] Change default value of sync mlog period parameter
+* Avoid too many warning logs being printed, when opening too many file handlers
+
+
+## Bug Fixes
+* [IOTDB-1960] Fix count timeseries bug in cluster mode
+* [IOTDB-2174] Fix Regexp filter serializing and deserializing error
+* [IoTDB-2185] fix get an exception bug when parsing the header of CSV
+* [IOTDB-2194] Fix SHOW TIMESERIES will only display 2000 timeseries in cluster mode
+* [IOTDB-2197] Fix datatype conversion exception in Spark Connector
+* [IOTDB-2209] Fix logback CVE-2021-42550 issue
+* [IOTDB-2219] Fix query in-memory data is incorrect in cluster mode
+* [IOTDB-2222] Fix OOM and data was written in incorrectly bugs of Spark Connector
+* [IOTDB-2251] [IOTDB-2252] Fix Query deadlock
+* [IOTDB-2282] fix tag recover bug after tag update
+* [IOTDB-2320] MemoryLeak cause by wal Scheduled trim task thread
+* [IOTDB-2381] Fix deadlock caused by incorrect buffer pool size counter
+* [IOTDB-2400] Fix series reader bug
+* [IOTDB-2426] WAL deadlock caused by too many open files
+* [IOTDB-2445] Fix overlapped data should be consumed first bug
+* [IOTDB-2499] Fix division by zero error when recovering merge
+* [IOTDB-2507] Fix NPE when merge recover
+* [IOTDB-2528] Fix MLog corruption and recovery bug after killing system
+* [IOTDB-2532] Fix query with align by device can't get value after clear cache
+* [IOTDB-2533] Fix change max_deduplicated_path_num does not take effect
+* [IOTDB-2544] Fix tag info sync error during metadata sync
+* [IOTDB-2550] Avoid show timeseries error after alter tag on sync sender
+* [IOTDB-2567] Fix thread and ByteBuffer leak after service stopped
+* [IOTDB-2568] "show query processlist" is blocked
+* [IOTDB-2580] Fix DirectByteBuffer and thread leak when deleting storage group
+* [IOTDB-2584] Fix cross space compaction selector
+* [IOTDB-2603] Fix compaction recover
+* [IOTDB-2604] Fix batch size is invalid in import-csv tool
+* [IOTDB-2620] Unrecognizable operator type (SHOW) for AuthorityChecker
+* [IOTDB-2624] Fix "overlapped data should be consumed first" occurs when executing query
+* [IOTDB-2640] Fix cross compaction recover bug
+* [IOTDB-2641] Fix time range of TsFile resource overlaps after unseq compaction
+* [IOTDB-2642] Fix the new file has a higher compact priority than the old file in unseq compaction
+* Fix a logical bug in processPlanLocally in cluster mode
+* Throw Exception while using last query with align by device
+* Add a judgement to determine raft log size can fit into buffer before log appending in cluster mode
+* Fix grafana can't be used bug
+
+# Apache IoTDB 0.12.4
+
+## New Features
+
+* [IOTDB-1823] group by multi level
+
+## Improvements
+
+* [IOTDB-2027] Rollback invalid entry after WAL writing failure
+* [IOTDB-2061] Add max concurrent sub query parameter, read data in batches to limit max IO and add max cached buffer size configuration
+* [IOTDB-2065] release TsFileSequenceReader soon when it is no longer used
+* [IOTDB-2072] Remove TVListAllocator to reduce the TVList mem cost
+* [IOTDB-2101] Reduce the memory footprint of QueryDataSource
+* [IOTDB-2102] Push limit operator down to each reader
+* [IOTDB-2123] Accelerate recovery process
+* update user guide for cpp-cpi and disable compiling nodejs in cpp-cli
+* Ignore too many WAL BufferOverflow log
+
+
+## Bug Fixes
+* [IOTDB-1408] Statement with 'as' executes incorrectly in mutil-path scenes
+* [IOTDB-2023] Fix serializing and deserializing bugs of Filters
+* [IOTDB-2025] Fix count nodes and devices incorrectly in cluster
+* [IOTDB-2031] Fix incorrect result of descending query with value filter in cluster
+* [IOTDB-2032] Fix incorrect result of descending query with multiple time partitions
+* [IOTDB-2039] Fix data redundant after too many open files exception occurs during compaction
+* [IOTDB-2047] Fix NPE when memControl is disabled and insert TEXT value to a non-TEXT series
+* [IOTDB-2058] Fix Query is blocked without sub-query-threads exist bug
+* [IOTDB-2063] Fix MinTimeDescAggregationResult implementation bug
+* [IOTDB-2064] Fix the NPE caused by map serde
+* [IOTDB-2068] Fix GZIP compressor meets ArrayIndexOutOfBoundsException
+* [IOTDB-2124] the filtering condition does not take efffect for last query in cluster
+* [IOTDB-2138] Fix data loss after IoTDB recover
+* [IOTDB-2140] Fix merge throw NullPointerException
+* [IOTDB-2152] PyClient: Override `__eq__()` of TSDataType, TSEncoding and Compressor to avoid unexpected comparation behaviour
+* [IOTDB-2160] Fix cluster groupby query cross-node reference leaks
+* [ISSUE-3335] Fix the bug of start-cli.sh -e mode can't work with wild card \*
+* fix memory leak: replace RandomDeleteCache with Caffine CacheLoader
+* Fix connection refused using session when users forget to set client ip
+
+
+# Apache IoTDB 0.12.3
+
+## Improvements
+
+* [IOTDB-842] Better Export/Import-CSV Tool
+* [IOTDB-1738] Cache paths list in batched insert plan
+* [IOTDB-1792] remove tomcat-embed dependency and make all transitive dependencies versions consistent
+* [ISSUE-4072] Parallel insert records in Session
+* Print the file path while meeting error in case of reading chunk
+
+## Bug Fixes
+
+* [IOTDB-1275] Fix backgroup exec for cli -e function causes an infinite loop
+* [IOTDB-1287] Fix C++ class Session has 2 useless sort()
+* [IOTDB-1289] fix CPP mem-leak in SessionExample.cpp insertRecords()
+* [IOTDB-1484] fix auto create schema in cluster
+* [IOTDB-1578] Set unsequnce when loading TsFile with the same establish time
+* [IOTDB-1619] Fix an error msg when restart iotdb-cluster
+* [IOTDB-1629] fix the NPE when using value fill in cluster mode
+* [IOTDB-1632] Fix Value fill function fills even when the data exists
+* [IOTDB-1651] add reconnect to solve out of sequence in sync module
+* [IOTDB-1659] Fix Windows CLI cannot set maxPRC less than or equal to 0
+* [IOTDB-1670] Fix cli -e mode didn't fetch timestamp_precision from server
+* [IOTDB-1674] Fix command interpret error causing somaxconn warning failed
+* [IOTDB-1677] Fix not generate file apache-iotdb-0.x.x-client-cpp-linux-x86_64-bin.zip.sha512
+* [IOTDB-1678] Fix client-cpp session bug: can cause connection leak.
+* [IOTDB-1679] client-cpp: Session descontruction need release server resource
+* [IOTDB-1690] Fix align by device type cast error
+* [IOTDB-1693] fix IoTDB restart does not truncate broken ChunkGroup bug
+* [IOTDB-1703] Fix MManager slow recover with tag
+* [IOTDB-1714] fix Could not find or load main class when start with jmx on win
+* [IOTDB-1723] Fix concurrency issue in compaction selection
+* [IOTDB-1726] Wrong hashCode() and equals() method in ChunkMetadata
+* [IOTDB-1727] Fix Slow creation of timeseries with tag
+* [IOTDB-1731] Fix sync error between different os
+* [IOTDB-1733] Fix dropping built-in function
+* [IOTDB-1741] Avoid double close in level compaction execution
+* [IOTDB-1785] Fix Illegal String ending with . being parsed to PartialPath
+* [IOTDB-1836] Fix Query Exception Bug after deleting all sgs
+* [IOTDB-1837] Fix tagIndex rebuild failure after upgrade mlog from mlog.txt to mlog.bin
+* [IOTDB-1838] The compacting status in SGP is always false
+* [IOTDB-1846] Fix the error when count the total number of devices in cluster mode
+* [IoTDB-1847] Not throw excpetion when pulling non--existent time series
+* [IOTDB-1850] Fix deserialize page merge rate limiter
+* [IoTDB-1865] Compaction is blocking when removing old files in Cluster
+* [IOTDB-1868] Use RwLock to reduce the lock time for nodeRing
+* [IOTDB-1872] Fix data increases abnormally after IoTDB restarts
+* [IOTDB-1877] Fix Sync recovery and reconnection bugs in both sender and receiver
+* [IOTDB-1879] Fix some Unsequence files never be merged to higher level or Sequence folder
+* [IOTDB-1887] Fix importing csv data containing null throws exception
+* [IOTDB-1893] Fix Can not release file lock in sync verify singleton
+* [IOTDB-1895] Cache leader optimization for batch write interfaces on multiple devices
+* [IOTDB-1903] Fix IndexOutOfRangeException when starting IoTDB
+* [IoTDB-1913] Fix When exporting a amount of data from csv, it will report network error or OOM
+* [IOTDB-1925] Fix the modification of max_select_unseq_file_num_in_each_compaction parameter does not take effect
+* [IOTDB-1958] Add storage group not ready exception
+* [IOTDB-1961] Cluster query memory leak
+* [IOTDB-1975] OOM caused by that MaxQueryDeduplicatedPathNum doesn't take effect
+* [IOTDB-1983] Fix DescReadWriteBatchData serializing bug
+* [IOTDB-1990] Fix unchecked null result by calling IReaderByTimestamp.getValuesInTimestamps()
+* [ISSUE-3945] Fix Fuzzy query not support multiDevices and alignByDevice Dataset
+* [ISSUE-4288] Fix CI issue caused by the invalid pentaho download url
+* [ISSUE-4293] SessionPool: InterruptedException is not properly handled in synchronized wait()
+* [ISSUE-4308] READ_TIMESERIES privilege granted to users and roles can not take effect when quering by UDFs
+* fix merge ClassCastException: MeasurementMNode
+* change sync version check to major version
+* init dummyIndex after restart cluster
+
+# Apache IoTDB 0.12.2
+
+## New Features
+
+* [IOTDB-959] Add create storage group Grammar
+* [IOTDB-1399] Add a session interface to connect multiple nodes
+* [IOTDB-1466] Support device template
+* [IOTDB-1491] UDTF query supported in cluster
+* [IOTDB-1496] Timed flush memtable
+* [IOTDB-1536] Support fuzzy query REGEXP
+* [IOTDB-1561] Support fill by specific value
+* [IOTDB-1565] Add sql: set system to readonly/writable
+* [IOTDB-1569] Timed close TsFileProcessor
+* [IOTDB-1586] Support mysql-style Like clause
+* [ISSUE-3811] Provide a data type column for the last query dataset
+* TTL can be set to the prefix path of storage group
+* add JMX monitor to all ThreadPools in the server module
+
+## Improvements
+
+* [IOTDB-1566] Do not restrict concurrent write partitions
+* [IOTDB-1585] ModificationFileâs write interface blocking
+* [IOTDB-1587] SessionPool optimization: a more aggressive Session creation strategy
+* Use StringCachedPool in TsFileResource to reduce the memory size
+* write performance optimization when replicaNum == 1
+* Optimize Primitive Array Manager
+* Function Improvement: add overlapped page rate in Tracing
+
+## Bug Fixes
+
+* [IOTDB-1282] fix C++ class SessionDataSet mem-leak
+* [IOTDB-1407] fix Filtering time series based on tags query fails Occasionally
+* [IOTDB-1437] Fix the TsFileSketchTool NPE
+* [IOTDB-1442] Time filter & TTL do not take effect in cluster
+* [IOTDB-1452] remove compaction log/ change logger to daily
+* [IOTDB-1447] ClientPool is blocking other nodes when one node fails
+* [IOTDB-1456] Fix Error occurred while executing delete timeseries statement
+* [IOTDB-1461] Fix compaction conflicts with ttl
+* [IOTDB-1462] Fix cross space compaction recover null pointer bug
+* [IOTDB-1464] fix take byte array null pointer
+* [IOTDB-1469] fix cross space compaction lost data bug
+* [IOTDB-1471] Fix path not right in "sg may not ready" log
+* [IOTDB-1475] MeasurementId check while create timeseries or template/ disable time or timestamp in timeseries path
+* [IOTDB-1488] Fix metaMember's forwarding clientPool timeout in cluster module
+* [IOTDB-1494] fix compaction block flush bug
+* [IoTDB-1499] Remove series registration using IoTDBSink
+* [IoTDB-1501] Fix compaction recover delete tsfile bug
+* [IOTDB-1529] Fix mlog recover idx bug and synchronize setStorageGroup
+* [IOTDB-1537] fix insertTablet permission
+* [IOTDB-1539] Fix delete operation with value filter is abnormal
+* [IOTDB-1540] Bug Fix: 500 when using IN operator
+* [IOTDB-1541] Fix query result not right due to non-precise time index of resource
+* [IOTDB-1542] Cpp client segment fault: char[] buffer overflow caused by long exception message
+* [IOTDB-1545] Query dataset memory leak on server caused by cpp client
+* [IOTDB-1546] Optimize the Upgrade Tool rewrite logic to reduce the temp memory cost
+* [IOTDB-1552] Only allow equivalent filter for TEXT data type
+* [IOTDB-1556] Abort auto create device when meet exception in setStorageGroup
+* [IOTDB-1574] Deleted file handler leak
+* [IOTDB-1580] Error result of order by time desc when enable time partition
+* [IOTDB-1584] Doesn't support order by time desc in cluster mode
+* [IOTDB-1588] Bug fix: MAX_TIME is incorrect in cluster mode
+* [IOTDB-1594] Fix show timeseries returns incorrect tag value
+* [IOTDB-1600] Fix InsertRowsOfOneDevicePlan being not supported in cluster mode
+* [IOTDB-1610] Fix TsFileRewriteTool writing incorrect data file
+* [ISSUE-3116] Bug when using natural month unit in time interval in group by query
+* [ISSUE-3316] Query result with the same time range is inconsistent in group by query
+* [ISSUE-3436] Fix query result not right after deleting multiple time interval of one timeseries
+* [ISSUE-3458] fix load configuration does not take effect
+* [ISSUE-3545] Fix Time interval value is disorder in group by month
+* [ISSUE-3653] fix Max_time and last return inconsistent result
+* [ISSUE-3690] Memory leaks on the server when cpp client invokes checkTimeseriesExists
+* [ISSUE-3805] OOM caused by Chunk cache
+* [ISSUE-3865] Meaningless connection reset issues caused by low default value for SOMAXCONN
+* Fix DataMigrationExample OOM if migrate too many timeseries
+* Handle false positive cases which may cause NPE of tsfile bloom filter
+* Fix Windows shell error on JDK11 & fix iotdb-env.bat not working
+* Fix cluster auto create schema bug when retry locally
+* Fix thrift out of sequence in cluster module
+* Skip non exist measurement in where clause in align by device
+* fix blocking query when selecting TsFile in compaction
+* Fix redundant data in compaction recover
+* Fix load tsfile with time partition enable
+
+## Incompatible changes
+
+* [IOTDB-1485] Replace tsfile_size_threshold by unseq_tsfile_size/seq_tsfile_size
+
+## Miscellaneous changes
+
+* [IOTDB-1499] Remove unused exception throwing notation in IoTDBSink
+* [IOTDB-1500] Remove current dynamic query memory control
+* [ISSUE-3674] Disable thrift code generation for Javascript
+* enable cacheLeader by default
+* add audit log when execute delete and set sg for tracing
+* modify nodeTool user to root
+
+# Apache IoTDB 0.12.1
+
+## Bug Fixes
+
+* [GITHUB-3373] Remove the broken cached leader connection & optimize the insertRecords method in session
+* [IOTDB-1433] Fix bug in getMetadataAndEndOffset when querying non-exist device
+* [IOTDB-1432] fix level compaction loss data
+* [IOTDB-1427] Fix compaction lock with query
+* [IOTDB-1420] Fix compaction ttl bug
+* [IOTDB-1419] Remove redundant clearCompactionStatus, fix continuous compaction doesn't take effect when
+ enablePartition
+* [IOTDB-1415] Fix OOM caused by ChunkCache
+* [IOTDB-1414] NPE occurred when call getStorageGroupNodeByPath() method using not exist path
+* [IOTDB-1412] Unclear exception message thrown when executing empty InsertTabletPlan
+* [IOTDB-1411] Fix thriftMaxFrameSize and thriftDefaultBufferSize does not in effect
+* [IOTDB-1398] Do not select unseq files when there are uncompacted old unseq files
+* [IOTDB-1390] Fix unseq compaction loss data bug
+* [IOTDB-1384] Fix group by bug
+* [ISSUE-3378] Fix NPE when clear upgrade folder; Fix some upgraded pageHeader missing statistics
+* [GITHUB-3339] Try to fix sg dead lock
+* [GITHUB-3329] Fix upgrade NPE and DeadLock
+* [GITHUB-3319] Fix upgrade tool cannot close file reader
+* [IOTDB-1212] Fix The given error message is not right when executing select sin(non_existence) from root.sg1.d1
+* [IOTDB-1219] Fix a potential NPE issue in UDF module
+* [IOTDB-1286] Fix 4 C++ mem-leak points
+* [IOTDB-1294] Fix delete operation become invalid after compaction
+* [IOTDB-1313] Fix lossing time precision when import csv with unsupported timestamp format
+* [IOTDB-1316] The importCsv tool should continue inserting if a part of insertion failed
+* [IOTDB-1317] Fix log CatchUp always failed due to not check the follower's match index
+* [IOTDB-1323] Fix return a success message when encounter RuntimeException during the insertion process
+* [IOTDB-1325] Fix StackOverflow Exception in group by natural month query
+* [IOTDB-1330] Fix the load tsfile bug when the cross multi partition's tsfile only have one page
+* [IOTDB-1348] Fix Last plan not work in cluster mode
+* [IOTDB-1376] Fix BatchProcessException was not correctly handled in BaseApplier
+* [ISSUE-3277] Fix TotalSeriesNumber in MManager counted twice when recovering
+* [ISSUE-3116] Fix bug when using natural month unit in time interval in group by query
+* [ISSUE-3309] Fix InsertRecordsOfOneDevice runs too slow
+* Fix the plan index is always zero when using insertRecords interface to run the cluster
+* Add authority check for users create timeseries using executeBatch interface without the privilege
+* Fix versionInfo NPE when query upgrading 0.11 tsfile
+* Fix upgrade tool cannot load old tsfile if time partition enabled in 0.11
+* Fix import csv throw ArrayOutOfIndexError when the last value in a line is null
+* Fix upgrade tool cannot close file reader
+
+## Improvements
+
+* [GITHUB-3399] Change the default primitive array size to 32
+* [IOTDB-1387] Support Without Null ALL in align by device clause, Filter RowRecord automatically if any column in it is
+ null or all columns are null
+* [IOTDB-1385] Extract the super user to the configuration
+* [IOTDB-1315] ExportCsvTool should support timestamp `yyyy-MM-dd'T'HH:mm:ss.SSSZ`
+* [IOTDB-1339] optimize TimeoutChangeableTSnappyFramedTransport
+* [IOTDB-1356] Separate unseq_file_num_in_each_level from selecting candidate file in unseq compaction
+* [IOTDB-1357] Compaction use append chunk merge strategy when chunk is already large enough
+* [IOTDB-1380] Automatically close the dataset while there is no more data
+* Optimize sync leader for meta
+
+## New Features
+
+* [GITHUB-3389] TTL can be set to any path
+* [GITHUB-3387] Add parameter compaction_interval=10000ms
+* [IOTDB-1190] Fully support HTTP URL char set in timeseries path
+* [IOTDB-1321][IOTDB-1322] Filter RowRecord automatically if any column in it is null or all columns are null
+* [IOTDB-1357] Compaction use append chunk merge strategy when chunk is already large
+* [ISSUE-3089] Make it possible for storage groups to have name with hyphen
+
+## Miscellaneous changes
+
+* [GITHUB-3346] upgrade netty and claim exclusion for enforcer check
+* [IOTDB-1259] upgrade libthrift from 0.12.0/0.13.0 to 0.14.1
+* Uncomment the less used configurations
+* Enable the configration `concurrent_writing_time_partition`
+
+
+# Apache IoTDB 0.12.0
+
+## New Features
+* [IOTDB-68] New shared-nothing cluster
+* [IOTDB-507] Add zeppelin-interpreter module
+* [IOTDB-825] Aggregation by natural month
+* [IOTDB-890] support SDT lossy compression
+* [IOTDB-944] Support UDTF (User-defined Timeseries Generating Function)
+* [IOTDB-965] Add timeout parameter for query
+* [IOTDB-1077] Add insertOneDeviceRecords API in java session
+* [IOTDB-1055] Support data compression type GZIP
+* [IOTDB-1024] Support multiple aggregated measurements for group by level statement
+* [IOTDB-1276] Add explain sql support and remove debug_state parameter
+* [IOTDB-1197] Add iotdb-client-go as a git submodule of IoTDB repo
+* [IOTDB-1230] Support spans multi time partitions when loading one TsFile
+* [IOTDB-1273] Feature/restrucutre python module as well as supporting pandas dataframe
+* [IOTDB-1277] support IoTDB as Flink's data source
+* [PR-2605] Add level merge to "merge" command
+
+## Incompatible changes
+* [IOTDB-1081] New TsFile Format
+* [ISSUE-2730] Add the number of unseq merge times in TsFile name.
+
+
+## Miscellaneous changes
+* [IOTDB-868] Change mlog from txt to bin
+* [IOTDB-1069] Restrict the flushing memtable number to avoid OOM when mem_control is disabled
+* [IOTDB-1104] Refactor the error handling process of query exceptions
+* [IOTDB-1108] Add error log to print file name while error happened
+* [IOTDB-1152] Optimize regular data size in traversing
+* [IOTDB-1180] Reset the system log file names and maximal disk-space size
+* [ISSUE-2515] Set fetchsize through JDBC and Session
+* [ISSUE-2598] Throw explicit exception when time series is unknown in where clause
+* [PR-2944] Throw exception when device to be queried is not in TsFileMetaData
+* [PR-2967] Log memory usage information in SystemInfo for better diagnosis
+
+## Bug Fixes
+* [IOTDB-1049] Fix NullpointerException and a delete bug in Last query
+* [IOTDB-1050] Fix Count timeserise column name is wrong
+* [IOTDB-1068] Fix Time series metadata cache bug
+* [IOTDB-1084] Fix temporary memory of flushing may cause OOM
+* [IOTDB-1106] Fix delete timeseries bug
+* [IOTDB-1126] Fix the unseq tsfile delete due to merge
+* [IOTDB-1135] Fix the count timeseries prefix path bug
+* [IOTDB-1137] Fix MNode.getLeafCount error when existing sub-device
+* [ISSUE-2484] Fix creating timeseries error by using "create" or "insert" statement
+* [ISSUE-2545, 2549] Fix unseq merge end time bug
+* [ISSUE-2611] An unsequence file that covers too many sequence file causes OOM query
+* [ISSUE-2688] LRULinkedHashMap does not work as an LRU Cache
+* [ISSUE-2709, 1178] Fix cache not cleared after unseq compaction bug, Fix windows 70,10 ci bug in unseq compaction ci
+* [ISSUE-2741] getObject method in JDBC should return an Object
+* [ISSUE-2746] Fix data overlapped bug after unseq compaction
+* [ISSUE-2758] NullPointerException in QueryTimeManager.checkQueryAlive()
+* [ISSUE-2905] Fix Files.deleteIfExists() doesn't work for HDFS file
+* [ISSUE-2919] Fix C++ client memory leak bug
+* [PR-2613] Fix importCSVTool import directory bug & encode bug
+* [PR-2409] Fix import csv which can't import time format str
+* [PR-2582] Fix sync bug for tsfiles's directory changed by vitural storage group
+* [ISSUE-2911] Fix The write stream is not closed when executing the command 'tracing off'
+
+# Apache IoTDB 0.11.4
+
+## Bug Fixes
+
+* IOTDB-1303 Disable group by without aggregation function in select clause
+* IOTDB-1306 Fix insertion blocked caused the deadlock in memory control module
+* IOTDB-1308 Fix users with READ_TIMESERIES permission cannot execute group by fill queries
+* IOTDB-1344 Fix cannot create timeseries caused by the timeseries count doesn't reset when deleting storage group
+* IOTDB-1384 Some value will disappear while using group by query
+* IOTDB-1398 Do not select unseq files when there are uncompacted old unseq files
+* ISSUE-3316 Fix query result with the same time range is inconsistent in group by query
+* Fix TotalSeriesNumber in MManager counted twice when recovering
+* Fix unseq compaction throws a wrong exception if some paths are not in the file
+* Fix overlapped data should be consumed first exception when query
+
+## Improvements
+
+* IOTDB-1356 Separate unseq_file_num_in_each_level from selecting candidate file in unseq compaction
+* IOTDB-1412 Unclear exception message thrown when executing empty InsertTabletPlan
+* continuous compaction in level compaction strategy when no tsfile is to be closed
+
+## New Features
+
+* support brackets with number in timeseries path
+
+# Apache IoTDB 0.11.3
+
+## Bug Fixes
+* ISSUE-2505 ignore PathNotExistException in recover and change recover error to warn
+* IOTDB-1119 Fix C++ SessionDataSet bug when reading value buffer
+* Fix SessionPool does not recycle session and can not offer new Session due to RunTimeException
+* ISSUE-2588 Fix dead lock between deleting data and querying in parallel
+* ISSUE-2546 Fix first chunkmetadata should be consumed first
+* IOTDB-1126 Fix unseq tsfile is deleted due to compaction
+* IOTDB-1137 MNode.getLeafCount error when existing sub-device
+* ISSUE-2624 ISSUE-2625 Avoid OOM if user don't close Statement and Session manually
+* ISSUE-2639 Fix possible NPE during end query process
+* Alter IT for An error is reported and the system is suspended occasionally
+* IOTDB-1149 print error for -e param when set maxPRC<=0
+* IOTDB-1247 Fix the insert blocked caused the bugs in mem control module
+* ISSUE-2648 Last query not right when having multiple devices
+* Delete mods files after compaction
+* ISSUE-2687 fix insert NaN bug
+* ISSUE-2598 Throw explicit exception when time series is unknown in where clause
+* Fix timeseriesMetadata cache is not cleared after the TsFile is deleted by a compaction
+* ISSUE-2611 An unsequence file that covers too many sequence file causes OOM query
+* IOTDB-1135 Fix count timeseries bug when the paths are nested
+* ISSUE-2709 IOTDB-1178 Fix cache is not cleared after compaction
+* ISSUE-2746 Fix data overlapped bug after the elimination unseq compaction process
+* Fix getObject method in JDBC should return an Object
+* IOTDB-1188 Fix IoTDB 0.11 unable to delete data bug
+* Fix when covering a tsfile resource with HistoricalVersion = null, itâll throw a NPE
+* fix the elimination unseq compaction may loss data bug after a delete operation is executed
+* Fix a bug of checking time partition in DeviceTimeIndex
+* Throw exeception when device to be queried is not in tsFileMetaData
+* Fix unseq compaction file selector conflicts with time partition bug
+* Fix high CPU usage during the compaction process
+
+## Improvements
+* IOTDB-1140 optimize regular data encoding
+* Add more log for better tracing
+* Add backgroup exec for cli -e function
+* Add max direct memory size parameter to env.sh
+* Change last cache log to debug level
+
+## New Features
+* Add explain sql support
+
+
+# Apache IoTDB 0.11.2
+
+## Bug Fixes
+* IOTDB-1049 Fix Nullpointer exception and a delete bug in Last query
+* IOTDB-1060 Support full deletion for delete statement without where clause
+* IOTDB-1068 Fix Time series metadata cache bug
+* IOTDB-1069 restrict the flushing memtable number to avoid OOM when mem_control is disabled
+* IOTDB-1077 add insertOneDeviceRecords API in java session
+* IOTDB-1087 fix compaction block flush: flush do not return until compaction finished
+* IOTDB-1106 Delete timeseries statement will incorrectly delete other timeseries
+* Github issue-2137 fix grafana value-time position bug
+* Github issue-2169 GetObject returns String for all data types
+* Github issue-2240 fix Sync failed: Socket is closed by peer
+* Github issue-2387 The deleteData method exists in Session but not in SessionPool.
+* add thrift_max_frame_size in iotdb-engine.properties
+* Fix incorrect last result after deleting all data
+* Fix compaction recover block restart: IoTDB cannot restart until last compaction recover task finished
+* Fix compaction ignore modification file: delete does not work after compaction
+* print more insert error message in client
+* expose enablePartition parameter into iotdb-engines.properpties
+
+# Apache IoTDB 0.11.1
+
+## Bug Fixes
+* IOTDB-990 cli parameter maxPRC shouldn't to be set zero
+* IOTDB-993 Fix tlog bug
+* IOTDB-994 Fix can not get last_value while doing the aggregation query along with first_value
+* IOTDB-1000 Fix read redundant data while select with value filter with unseq data
+* IOTDB-1007 Fix session pool concurrency and leakage issue when pool.close is called
+* IOTDB-1016 overlapped data should be consumed first
+* IOTDB-1021 Fix NullPointerException when showing child paths of non-existent path
+* IOTDB-1028 add MAX\_POINT\_NUMBER format check
+* IOTDB-1034 Fix Show timeseries error in Chinese on Windows
+* IOTDB-1035 Fix bug in getDeviceTimeseriesMetadata when querying non-exist device
+* IOTDB-1038 Fix flink set storage group bug
+* ISSUE-2179 fix insert partial tablet with binary NullPointer bug
+* add reject status code
+* Update compaction level list delete
+* Fix query result is not correct
+* Fix import errors in Session.py and SessionExample.py
+* Fix modules can not be found when using pypi to pack client-py
+* Fix Count timeseries group by level bug
+* Fix desc batchdata count bug
+
+# Apache IoTDB 0.11.0
+
+## New Features
+
+* IOTDB-627 Support range deletion for timeseries
+* IOTDB-670 Add raw data query interface in Session
+* IOTDB-716 add lz4 compression
+* IOTDB-736 Add query performance tracing
+* IOTDB-776 New memory control strategy
+* IOTDB-813 Show storage group under given path prefix
+* IOTDB-848 Support order by time asc/desc
+* IOTDB-863 add a switch to drop ouf-of-order data
+* IOTDB-873 Add count devices DDL
+* IOTDB-876 Add count storage group DDL
+* IOTDB-926 Support reconnection of Session
+* IOTDB-941 Support 'delete storage group <prefixPath>'
+* IOTDB-968 Support time predicate in select last, e.g., select last * from root where time >= T
+* Show alias if it is used in query
+* Add level compaction strategy
+* Add partialInsert
+
+## Incompatible changes
+
+* IOTDB-778 Support double/single quotation in Path
+* IOTDB-870 change tags and attributes output to two columns with json values
+
+## Miscellaneous changes
+
+* IOTDB-784 Update rpc protocol to V3
+* IOTDB-790 change base_dir to system_dir
+* IOTDB-829 Accelerate delete multiple timeseries
+* IOTDB-839 Make Tablet api more friendly
+* IOTDB-902 Optimize max_time aggregation
+* IOTDB-916 Add a config entry to make Last cache configurable
+* IOTDB-928 Make ENCODING optional in create time series sentence
+* IOTDB-938 Re-implement Gorilla encoding algorithm
+* IOTDB-942 Optimization of query with long time unsequence page
+* IOTDB-943 Fix cpu usage too high
+* Add query load log
+* Add merge rate limiting
+
+## Bug Fixes
+
+* IOTDB-749 Avoid select * from root OOM
+* IOTDB-774 Fix "show timeseries" OOM problem
+* IOTDB-832 Fix sessionPool logic when reconnection failed
+* IOTDB-833 Fix JMX cannot connect IoTDB in docker
+* IOTDB-835 Delete timeseries and change data type then write failed
+* IOTDB-836 Statistics classes mismatched when endFile ï¼delete timeseries then recreateï¼
+* IOTDB-837 ArrayIndexOutOfBoundsException if the measurementId size is not consistent with the value size
+* IOTDB-847 Fix bug that 'List user privileges' cannot apply to 'root'
+* IOTDB-850 a user could list others privilege bug
+* IOTDB-851 Enhance failure tolerance when recover WAL (enable partial insertion)
+* IOTDB-855 Can not release Session in SessionPool if RuntimeException occurs
+* IOTDB-868 Can not redo mlogs with special characters like comma
+* IOTDB-872 Enable setting timezone at client
+* IOTDB-877 fix prefix bug on show storage group and show devices
+* IOTDB-904 fix update last cache NullPointerException
+* IOTDB-920 Disable insert row that only contains time/timestamp column
+* IOTDB-921 When execute two query simultaneously in one statement, got error
+* IOTDB-922 Int and Long can convert to each other in ResultSet
+* IOTDB-947 Fix error when counting node with wildcard
+* IOTDB-949 Align by device doesn't support 'T*' in path.
+* IOTDB-956 Filter will be missed in group by time align by device
+* IOTDB-963 Redo deleteStorageGroupPlan failed when recovering
+* IOTDB-967 Fix xxx does not have the child node xxx Bug in count timeseries
+* IOTDB-970 Restrict log file number and size
+* IOTDB-971 More precise error messages of slimit and soffset
+* IOTDB-975 when series does not exist in TsFile, reading wrong ChunkMetadataList
+
+# Apache IoTDB (incubating) 0.10.1
+
+* [IOTDB-797] InsertTablet deserialization from WAL error
+* [IOTDB-788] Can not upgrade all storage groups
+* [IOTDB-792] deadlock when insert while show latest timeseries
+* [IOTDB-794] Rename file or delete file Error in start check in Windows
+* [IOTDB-795] BufferUnderflowException in Hive-connector
+* [IOTDB-766] Do not release unclosed file reader, a small memory leak
+* [IOTDB-796] Concurrent Query throughput is low
+* Query result is not correct when some unsequence data exists
+* Change the default fetch size to 10000 in session
+* [IOTDB-798] fix a set rowLimit and rowOffset bug
+* [IOTDB-800] Add a new config type for those parameters which could not be modified any more after the first start
+* [IOTDB-802] Improve "group by" query performance
+* [IOTDB-799] remove log visualizer tool from v0.10
+* fix license-binary
+* [IOTDB-805] Fix BufferUnderflowException when querying TsFile stored in HDFS
+* python session client ver-0.10.0
+* [IOTDB-808] fix bug in selfCheck() truncate
+* fix doc of MeasurementSchema in Tablet
+* [IOTDB-811] fix upgrading mlog many times when upgrading system.properties crashed
+* Improve IoTDB restart process
+* remove jol-core dependency which is introduced by hive-serde 2.8.4
+* remove org.json dependency because of license compatibility
+* [ISSUE-1551] fix set historical version when loading additional tsfile
+
+
+# Apache IoTDB (incubating) 0.10.0
+
+## New Features
+
+* IOTDB-217 A new GROUPBY syntax, e.g., select avg(s1) from root.sg.d1.s1 GROUP BY ([1, 50), 5ms)
+* IOTDB-220 Add hot-load configuration function
+* IOTDB-275 allow using user defined JAVA_HOME and allow blank space in the JAVA_HOME
+* IOTDB-287 Allow domain in JDBC URL
+* IOTDB-292 Add load external tsfile feature
+* IOTDB-297 Support "show flush task info"
+* IOTDB-298 Support new Last point query. e.g, select last * from root
+* IOTDB-305 Add value filter function while executing align by device
+* IOTDB-309 add Dockerfiles for 0.8.1, 0.9.0, and 0.9.1
+* IOTDB-313 Add RandomOnDiskUsableSpaceStrategy
+* IOTDB-323 Support insertRecords in session
+* IOTDB-337 Add timestamp precision properties for grafana
+* IOTDB-343 Add test method in session
+* IOTDB-396 Support new query clause: disable align, e.g., select * from root disable align
+* IOTDB-447 Support querying non-existing measurement and constant measurement
+* IOTDB-448 Add IN operation, e.g., where time in (1,2,3)
+* IOTDB-456 Support GroupByFill Query, e.g., select last_value(s1) from root.sg.d1 GROUP BY ([1, 10), 2ms) FILL(int32[previousUntilLast])
+* IOTDB-467 The CLI displays query results in a batch manner
+* IOTDB-497 Support Apache Flink Connector with IoTDB
+* IOTDB-558 add text support for grafana
+* IOTDB-560 Support Apache Flink connecter with TsFile
+* IOTDB-565 MQTT Protocol Support, disabled by default, open in iotdb-engine.properties
+* IOTDB-574 Specify configuration when start iotdb
+* IOTDB-588 Add tags and attributes management
+* IOTDB-607 add batch create timeseries in native interface
+* IOTDB-612 add limit&offset to show timeseries
+* IOTDB-615 Use TsDataType + Binary to replace String in insert plan
+* IOTDB-617 Support alter one time series's tag/attribute
+* IOTDB-630 Add a jdbc-like way to fetch data in session
+* IOTDB-640 Enable system admin sql (flush/merge) in JDBC or Other API
+* IOTDB-671 Add clear cache command
+* Support open and close time range in group by, e.g, [), (]
+* Online upgrade from 0.9.x
+* Support special characters in path: -/+&%$#@
+* IOTDB-446 Support path start with a digit, e.g., root.sg.12a
+* enable rpc compression in session pool
+* Make JDBC OSGi usable and added a feature file
+* add printing one resource file tool
+* Allow count timeseries group by level=x using default path
+* IOTDB-700 Add OpenID Connect based JWT Access as alternative to Username / Password
+* IOTDB-701 Set heap size by percentage of system total memory when starts
+* IOTDB-708 add config for inferring data type from string value
+* IOTDB-715 Support previous time range in previousuntillast
+* IOTDB-719 add avg_series_point_number_threshold in config
+* IOTDB-731 Continue write inside InsertPlan
+* IOTDB-734 Add Support for NaN in Double / Floats in SQL Syntax.
+* IOTDB-744 Support upsert alias
+
+
+## Incompatible changes
+
+* IOTDB-138 Move All metadata query to usual query
+* IOTDB-322 upgrade to thrift 0.12.0-0.13.0
+* IOTDB-325 Refactor Statistics in TsFile
+* IOTDB-419 Refactor the 'last' and 'first' aggregators to 'last_value' and 'first_value'
+* IOTDB-506 upgrade the rpc protocol to v2 to reject clients or servers that version < 0.10
+* IOTDB-587 TsFile is upgraded to version 2
+* IOTDB-593 add metaOffset in TsFileMetadata
+* IOTDB-597 Rename methods in Session: insertBatch to insertTablet, insertInBatch to insertRecords, insert to insertRecord
+* RPC is incompatible, you can not use client-v0.9 to connect with server-v0.10
+* TsFile format is incompatible, will be upgraded when starting 0.10
+* Refine exception code in native api
+
+## Miscellaneous changes
+
+* IOTDB-190 upgrade from antlr3 to antlr4
+* IOTDB-418 new query engine
+* IOTDB-429 return empty dataset instead of throw exception, e.g., show child paths root.*
+* IOTDB-445 Unify the keyword of "timestamp" and "time"
+* IOTDB-450 Add design documents
+* IOTDB-498 Support date format "2020-02-10"
+* IOTDB-503 Add checkTimeseriesExists in java native api
+* IOTDB-605 Add more levels of index in TsFileMetadata for handling too many series in one device
+* IOTDB-625 Change default level number: root is level 0
+* IOTDB-628 rename client to cli
+* IOTDB-621 Add Check isNull in Field for querying using session
+* IOTDB-632 Performance improve for PreviousFill/LinearFill
+* IOTDB-695 Accelerate the count timeseries query
+* IOTDB-707 Optimize TsFileResource memory usage
+* IOTDB-730 continue write in MQTT when some events are failed
+* IOTDB-729 shutdown uncessary threadpool
+* IOTDB-733 Enable setting for mqtt max length
+* IOTDB-732 Upgrade fastjson version to 1.2.70
+* Allow "count timeseries" without a prefix path
+* Add max backup log file number
+* add rpc compression api in client and session module
+* Continue writing the last unclosed file
+* Move the vulnera-checks section into the apache-release profile to accelerate compile
+* Add metaquery in python example
+* Set inferType of MQTT InsertPlan to true
+
+
+
+## Bug Fixes
+
+* IOTDB-125 Potential Concurrency bug while deleting and inserting happen together
+* IOTDB-185 fix start-client failed on WinOS if there is blank space in the file path; let start-server.bat suport jdk12,13 etc
+* IOTDB-304 Fix bug of incomplete HDFS URI
+* IOTDB-341 Fix data type bug in grafana
+* IOTDB-346 Fix a bug of renaming tsfile in loading function
+* IOTDB-370 fix a concurrent problem in parsing sql
+* IOTDB-376 fix metric to show executeQuery
+* IOTDB-392 fix export CSV
+* IOTDB-393 Fix unclear error message for no privilege users
+* IOTDB-401 Correct the calculation of a chunk if there is no data in the chunk, do not flush empty chunk
+* IOTDB-412 Paths are not correctly deduplicated
+* IOTDB-420 Avoid encoding task dying silently
+* IOTDB-425 fix can't change the root password.
+* IOTDB-459 Fix calmem tool bug
+* IOTDB-470fix IllegalArgumentException when there exists 0 byte TsFile
+* IOTDB-529 Relative times and NOW() operator cannot be used in Group By
+* IOTDB-531 fix issue when grafana visualize boolean data
+* IOTDB-546 Fix show child paths statement doesn't show quotation marks
+* IOTDB-643 Concurrent queries cause BufferUnderflowException when storage in HDFS
+* IOTDB-663 Fix query cache OOM while executing query
+* IOTDB-664 Win -e option
+* IOTDB-669 fix getting two columns bug while âshow devicesâ in session
+* IOTDB-692 merge behaves incorrectly
+* IOTDB-712 Meet BufferUnderflowException and can not recover
+* IOTDB-718 Fix wrong time precision of NOW()
+* IOTDB-735 Fix Concurrent error for MNode when creating time series automatically
+* IOTDB-738 Fix measurements has blank
+
+* fix concurrent auto create schema conflict bug
+* fix meet incompatible file error in restart
+* Fix bugs of set core-site.xml and hdfs-site.xml paths in HDFS storage
+* fix execute flush command while inserting bug
+* Fix sync schema pos bug
+* Fix batch execution bug, the following sqls will all fail after one error sql
+* Fix recover endTime set bug
+
+
+# Apache IoTDB (incubating) 0.9.3
+
+## Bug Fixes
+- IOTDB-531 Fix that JDBC URL does not support domain issue
+- IOTDB-563 Fix pentaho cannot be downloaded because of spring.io address
+- IOTDB-608 Skip error Mlog
+- IOTDB-634 Fix merge caused errors for TsFile storage in HDFS
+- IOTDB-636 Fix Grafana connector does not use correct time unit
+
+## Miscellaneous changes
+- IOTDB-528 Modify grafana group by
+- IOTDB-635 Add workaround when doing Aggregation over boolean Series
+- Remove docs of Load External Tsfile
+- Add Grafana IoTDB Bridge Artifact to distribution in tools/grafana folder
+
+
+# Apache IoTDB (incubating) 0.9.2
+
+## Bug Fixes
+- IOTDB-553 Fix Return Empty ResultSet when queried series doesn't exist
+- IOTDB-575 add default jmx user and password; fix issues that jmx can't be accessed remotely
+- IOTDB-584 Fix InitializerError when recovering files on HDFS
+- Fix batch insert once an illegal sql occurs all the sqls after that will not succeed
+- Fix concurrent modification exception when iterator TsFileResourceList
+- Fix some HDFS config issues
+- Fix runtime exception not be catched and sync schema pos was nullpointer bug in DataTransferManager
+- Fix python rpc grammar mistakes
+- Fix upgrade ConcurrentModificationException
+
+## Miscellaneous changes
+- IOTDB-332 support Chinese characters in path
+- IOTDB-316 add AVG function to 4-SQL Reference.md and modify style
+- improve start-server.bat by using quotes to protect against empty entries
+- Add Chinese documents for chapter 4.2
+- change download-maven-plugin to 1.3.0
+- add session pool
+- add insertInBatch in Session
+- add insertInBatch to SessionPool
+- modify 0.9 docs to fit website
+- remove tsfile-format.properties
+- add bloom filter in iotdb-engien.properties
+- update server download doc
+- typos fix in Rel/0.9 docs
+- support 0.12.0 and 0.13.0 thrift
+
+# Apache IoTDB (incubating) 0.9.1
+
+## Bug Fixes
+
+- IOTDB-159 Fix NullPointerException in SeqTsFileRecoverTest and UnseqTsFileRecoverTest
+- IOTDB-317 Fix a bug that "flush + wrong aggregation query" causes the following queries to fail
+- IOTDB-324 Fix inaccurate statistics when writing in batch
+- IOTDB-327 Fix a groupBy-without-value-filter query bug caused by the wrong page skipping logic
+- IOTDB-331 Fix a groupBy query bug when axisOrigin-startTimeOfWindow is an integral multiple of interval
+- IOTDB-357 Fix NullPointerException in ActiveTimeSeriesCounter
+- IOTDB-359 Fix a wrong-data-type bug in TsFileSketchTool
+- IOTDB-360 Fix bug of a deadlock in CompressionRatio
+- IOTDB-363 Fix link errors in Development-Contributing.md and add Development-Document.md
+- IOTDB-392 Fix a bug in CSV export tool
+- Fix apache rat header format error in some files
+
+## Miscellaneous changes
+
+- IOTDB-321 Add definitions of time expression and LEVEL in related documents
+- Support pypi distribution for Python client
+
+# 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) 0.8.2
+
+ This is a bug-fix version of 0.8.1
+
+- IOTDB-264 lack checking datatype before writing WAL
+- IOTDB-317 Fix "flush + wrong aggregation" causes failed query in v0.8.x
+- NOTICE and LICENSE file update
+
+# 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 <username> on <path> 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-Connector 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
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