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+<!--
+
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+ to you under the Apache License, Version 2.0 (the
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+ with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing,
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+ KIND, either express or implied. See the License for the
+ specific language governing permissions and limitations
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+-->
+
+# 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 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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