# TDengine ver-3.3.8.4 — 3.3.8.4

- Product: TDengine (https://whatsnew.fyi/product/tdengine)
- Vendor: taosdata
- Date: 2025-11-04
- Version: ver-3.3.8.4
- Original notes: https://github.com/taosdata/TDengine/releases/tag/ver-3.3.8.4
- Permalink: https://whatsnew.fyi/product/tdengine/releases/ver-3.3.8.4

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — taosX support OPC failover endpoint
- **changed** — taosX allow sync from higher precision to lower eg. ns to ms
- **changed** — Adapter support connection management and request limit
- **changed** — Improve performance for last_row + composite queries
- **changed** — taosws taos_stmt_num_params support selects
- **changed** — Improve log and error code display during mnode startup
- **changed** — Refine document for error codes
- **changed** — Reduce CPU usage for stream when reading data
- **changed** — Speedup small queries in C/Rust websocket connection
- **changed** — REST API response will use null for nan/inf instead of error
- **changed** — No longer retry timed-out RPC messages
- **changed** — Improve performance for last_row + tags queries
- **changed** — Improve query performance for virtual super tables
- **changed** — Explorer Grid canvas support plotting with DECIMAL
- **changed** — OpenTSDB data-in support timestamp/value field rename
- **changed** — Unify login-register process in enterprise and community
- **changed** — Add configuration parameter rpcRecvLogThreshold to set the threshold for warning logs in the rpc module
- **changed** — Explorer Dashboard node table now is sortable
- **fixed** — tmq_get_json_meta behaves unexpectedly when the tags of subscribed meta messages contain empty strings
- **fixed** — Decode overflow interior page returns wrong pgno

##### Behavior change and compatibility

##### Features
  1. feat: taosX support OPC failover endpoint

##### Enhancements
  1. enh: taosX allow sync from higher precision to lower eg. ns to ms
  2. enh: Adapter support connection management and request limit
  3. enh: improve performance for last_row + composite queries
  4. enh: taosws taos_stmt_num_params support selects
  5. enh: improve log and error code display during mnode startup
  6. enh: refine document for error codes
  7. enh: reduced CPU usage for stream when reading data
  8. enh: speedup small queries in C/Rust websocket connection
  9. enh: REST API response will use null for nan/inf instead of error
 10. enh: no longer retry timed-out RPC messages
 11. enh: improve performance for last_row + tags queries
 12. enh: Improved query performance for virtual super tables
 13. enh: Explorer Grid canvas suppot plotting with DECIMAL
 14. enh: OpenTSDB data-in support timestamp/value field rename
 15. enh: unify login-register process in enterprise & community
 16. enh: add configuration parameter rpcRecvLogThreshold to set the threshold for warning logs in the rpc module
 17. en: Explorer Dashboard node table now is sortable

##### Fixes
  1. fix: tmq_get_json_meta behaves unexpectedly when the tags of subscribed meta messages contain empty strings.
  2. fix: decode overflow interior page returns wrong pgno
  3. fix: free() invalid pointer in taos-connector-rust
  4. fix: the retention task does not exit when drop and recreate database with the same name while RSMA exists
  5. fix: clearing user_ip in taos_options_connection does not take effect
  6. fix: slow leader election when a single node in a dual-replica setup loses network connectivity
  7. fix: crash occurred when querying a virtual supertable without including the timestamp primary key
  8. fix: fixed the rare issue of inconsistent config parameter values across dnodes after modifying dnode parameters.
  9. fix: incorrect result issue when the stream statement contains tag=%%1.
 10. fix: state window fails to properly handle data with NULL states
 11. fix: crash when concurrent writes and last queries are performed simultaneously.
 12. fix: new values cannot be immediately queried after updating server configuration parameters
 13. fix: fix C WebSocket stmt2 automatic reconnection
 14. fix: subscription failure when the WAL version number exceeds the maximum value of int32
 15. fix: startup failure on CPUs with 200 cores or more
 16. fix: explorer query NaN as null
 17. fix: show create table command execute error when the tag value is an empty string
 18. fix: crash caused by memory cleanup when sync message sending fails
 19. fix: incorrect _wduration result in time window queries with sliding.
 20. fix: invalid sttblockreader initialization actions in window queries.
 21. fix: resolved incorrect end_point information in perf_connections

##### What's Changed
* enh: optimize stable event window plan by @dapan1121 in https://github.com/taosdata/TDengine/pull/33195
* fix: TD-38212 by @cadem in https://github.com/taosdata/TDengine/pull/33186
* docs: update release note for 3.3.8.1 in office web by @feici02 in https://github.com/taosdata/TDengine/pull/33216
* fix: type conversion error by @menshibin in https://github.com/taosdata/TDengine/pull/32844
* feat: complete version number character copying by @menshibin in https://github.com/taosdata/TDengine/pull/33206
* docs: update python ws version history by @qevolg in https://github.com/taosdata/TDengine/pull/33222
* fix: fix tdgpt timemoe model directory by @SallyHuo-TAOS in https://github.com/taosdata/TDengine/pull/33213
* enh(last): enable reading cache when select last and tags by @Tony2h in https://github.com/taosdata/TDengine/pull/33204
* enh: TD-38163-mnode-open-log by @guanshengliang in https://github.com/taosdata/TDengine/pull/33160
* fix: clearing user_ip in taos_options_connection does not take

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