2.6.0.30

Release Notes

from：release/ver-2.6.0.28
to：release/ver-2.6.0.30

FIX BUGS:
fix: fixed three problems about corrupted wal would be repaired (#17904)
fix: taosbenchmark query concurrent segfault for 2.6 (#17796)
fix(taosAdapter): fix cors config (#910)
fix: last function optimize error (#17747)

ENHANCEMENTS:
fix: show result format (#17949)
fix: taosbenchmark query interval unit (#17879)
feat: taosbenchmark support query fails then continue for 2.6 (#17981)
feat(schemaless): support escape character back-slash tab and back-slash return (#17776)

3.0.1.6

Enhancements:

• TSMA can handle historical and out-of-order data
• Performance optimization in a lot of querying scenarios on a super table: last_row(), last(), cound(*), avg(), max(), min(), limit
• Security improvement by RPC integrity check
• Optimized error message when client version doesn't match with the server
• Performance improvement for select * from ins_tables
• "show dnode variables" can be used with like clause
• "show cluster variables" can show the cluster level configurations
• "show vgroup" added a new state: restore
• Table length is checked when adding a new column
• Enhanced the atomicity of vnode commit
• Improved stability

Fixed OOM & Crash:

• OOM in case of "select *" from a super table
• taosd crash causedby interp()
• taosd hangs in cloud service
• taosd OOM after long time data writing
• OOM caused by taosc in taosBenchmark and taosAdapter
• Some crashes occurred in case of replica=3
• mnode failed to restart because of corrupted metadata
• taosd crash caused by not deleting the index of deleted tables
• taosd crash caused by last_row()
• taosd crash caused by querying with group by and where condition
• taosd crash caused by querying data from deleted tables
• taosd crash caused by "show create table" on a table of 4,000 columns
• taosd crash caused by count(*)
• taos crash caused by broken network
• taos crash caused by completing the command automatically
• Some other crash problems

Fixed functional bugs:

• last() doesn't return result even though there is data
• Pseudo column _irowts returns zero timestamp
• The number of rows returned by count(*) is larger than actual data size by one
• "show create database" doesn't show cachesize parameter
• Wrong result returned by apercentile()
• Reesults are different when querying with "group by" and "where" on same tag
• Incorrect sequence returned by order by
• Two mnodes are in "candidate" and one is in "leader"

2.6.0.28

Release Notes

from：release/ver-2.6.0.24
to：release/ver-2.6.0.28

FIX BUGS:
fix: compatible v2.0 2.2 mdb file format and ignore blank (#17623)
fix:table does not exist if drop database then create database in schemaless (#17451)
fix: fix mode function behavior if multiple highest occurrence exist (#17452)
fix: fix rpc context freed in timer callback issue (#17447)

ENHANCEMENTS:
enh: supports online alter DB parameter minRows (#17390)

3.0.1.5

Enhancements:

• macOS x64 and macOS ARM64 are supported
• Performance optimization for both data writing and querying
• RPC compression
• Distributed internval is supported in stream processing
• Command can be completed automatically suing shortcut key in TDengine CLI
• pages and buffer parameter can be altered for a created database
• subtable name can be customized in stream processing
• interp function returns timestamp using _irowts pseudo column
• TDengine CLI reconnect cloud service automatically when user starts to operate
• Performance optimization for select tag_value from information_schema.ins_tags
• Performance optimization for select distinct(tbname)
• Speed control when transferring data across multiple storage tiers
• taosd can still start even after WAL is corrupted
• Optimization for getting timestamp in log module
• Performance optimization for filtering with tbname in clause
• Performance optimization for creating normal tables
• Performance optimization for RPC by caching the mapping from FQDN to IP
• Performance optimization for first(*) function

Fixed Bugs:

• Data loss happened when inserting high volume of data
• insert_req statistics in log database is not updated when writing in schemaless protocol
• Dnode offline in a cluster of 5 nodes
• Select count(*) returns wrong result
• TSDB commit failed
• taos crashed in tdb pager
• taosd failed to restart after freeing up disk space when disk is exhausted
• Memory leaks in taosd
• Schemaless protocol insersion failed with \u0000
• taosd crahsed when it can't recognize FQDN and doesn't report any useful error message
• OOM happend when importing data from a CSV file
• tbname returned by HISTOGRAM function is incorrect
• taosd crahsed when trying to insert data after disk is exhausted
• taosc crash when "select c1 from db.tb where c1="$max_binary_length"
• Infinite loop when querying last_row()
• taosd crash when create stream with data_filter
• Result is inconsistent between last_row() and select * order by ts limit 1
• Reporting statistical data may block heartbeat messages
• tsdb commit failed
• index thread consumes 100% CPU and blocks tbd modle
• max() returns wrong result
• TDengine CLI crashed on Windows when executing source command in it
• Command over 1K bytes is truncated on Windows and can't be executed
• Drop database failed on macOS
• taosd deadlock on macOS/M1
• order by _wstart desc returns wrong result if sliding is lower than half of interval
• select last_row() group by tbname returns Too many time windows in query
• Fixed erros in github compilation guide
• taos crashed when deleting a STable of 4096 columns
• cast() error
• show tables don't support back quote
• taosd can't start when WAL is corrupted
• dnode offline happened frequently on macOS
• taosc crashed with "interp every(0s)"
• "Out of memory" is reported when creating a database
• taosBenchmark crashed when inserting data
• taosd crashed when doing time window query
• mnode crahsed when restarting taosd with existing data
• select last_row(*) from information_schema.ins_tables failed
• taosd crashed when select count(*) on the resulting table of stream processing
• Scalar function crashed with stream processing
• UDFD crashed
• Result of mode() is wrong
• tags are not returned when select *
• Some other crashe problems in taosd

2.6.0.24

Release Notes

from：release/ver-2.6.0.22
to：release/ver-2.6.0.24

FIX BUGS:
fix: taosbenchmark coverity scan issues for 2.6 (#17362)
fix: release the local meta cache of each sql (#17312)
fix: set precision of timestamp for QueryAttr in tscCreateQueryFromQueryInfo (#17268)
fix: shell source error (#17243)
fix: mem tskey maybe large than pCheckInfo->lastKey if order desc (#17209)

ENHANCEMENTS:
enh(taosAdapter): set maxConnect default value to 2x cpu cores (#17277)
enh(taosAdapter): adapt to taos_schemaless_insert_raw (#17215)
feat: support aggAlways config option to control count if zero row (#17095)

2.6.0.22

Release Notes

from：release/ver-2.6.0.18
to：release/ver-2.6.0.22

FIX BUGS:
fix:change the new interface name of schemaless (#17188)
fix: change the size limit of sql stmt rebuilt for show create table to TSDB_MAX_SQL_LEN (#16767)
fix: synchronize initialization and destruction of subqueries and their states (#16895)
fix:double free (#16933)
fix: aggregation error when one group rows exceed int16_max (#16911)

ENHANCEMENTS:
fix: improve group by performance by skip sort when group by (#16913)

3.0.1.4

Enhancements:

• Performance optimization for both data writing and query
• FILL is supported in stream processing
• interp function can return timestamp
• Add index by default for system builtin tables
• Some columns can't be queried from information_schema.ins_tables

Fixed Bugs:

• Memory leak in TDengine CLI
• The result is different when querying first with or without interval
• Query returns empty data set
• Error result when delete source data of a stream processing
• taosd crash

3.0.1.3

Enhancements

• Performance optimization for avg() function
• Optimization for taosd startup speed
• Performance optimization for index module in case of over 1 million tables
• KeepColumnName functionality of 2.x was supported in 3.0
• "taosd -s" can dump detailed information of mnode
• "show transactions" command can output the operation in progress
• Disable join operation on non timestamp columns
• Log optimization of TDB module to downgrade the CPU usage of mnode

Fixed Bugs

• Some crash problems in taosd
• Some memory leaks in taosd and taosAdapter
• Deleted data can still be queried
• Schemaless writing are not accumulated in statistical data for writing
• Wrong result when matching with NCHAR
• Action output by show transactions command is wrong when a transaction fails
• Wrong result of max() on float column
• Some bugs in planner and query module

3.0.1.2

Enhancements

• Performance optimization for twa on super table
• Performance optimization for select count(*)
• TTL can be used when creating table automatically with insert statement
• Prefix and Suffix can be configured to influence the hash on table name

Fixed Bugs

• taosd crash when querying number of subtables and can't be restarted
• taosd crash caused by interp()
• taosd crash caused by twa+interval
• taosd crash caused by invalid row index
• taosd failed to restart with existing data
• taosd crash after alter table TTL to 1 and continue to crash when restarting
• taosd crash caused by last()
• taosd crash caused by query with group by
• taosd crash caused by percentile
• taosd crash after creating stream
• taosd crash when inserting with stream
• vnode traps in infinite loop
• Insert hangs after creating SMA
• Deadlock in client side caused by frequent taos_connect()/taos_close()
• CPU usage is too high when querying number of subtables
• Client hang caused by high stress querying
• limit doesn't work with nested query
• TTL used as query condition doesn't work for information_schema
• Calculation error in length() function
• Memory leak problems in taosd
• Some other crashes in taosd

2.6.0.18

Release Notes

from：release/ver-2.6.0.16
to：release/ver-2.6.0.18

FIX BUGS:
fix: taosd/taosc crash issue (#16822)
fix: Error in schemaless if colume value is empty (#16785)
fix: The name of fields maybe contain dot (#16726)
fix: Resolve an issue of index out-of-range in tscBuildQueryStreamDesc etc. (#16721)
fix: Resolve an assertion of index out of range in subAndCheckDone (#16719)
fix: Save row count with int16_t smaller (#16680)