update rpc log

[yihaoDeng]

Description

Please briefly describe the code changes in this pull request.

Jira: https://jira.taosdata.com:18080/browse/TD-

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @yihaoDeng, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on refining the RPC (Remote Procedure Call) mechanism by making a crucial adjustment to the order of resource cleanup operations and enhancing the logging for transaction management. These changes are intended to improve the robustness of RPC resource handling and provide more precise debugging information for the transaction lifecycle.

Highlights

• RPC Resource Cleanup Order: The order of transReleaseExHandle and transRemoveExHandle calls within the rpcClose function has been swapped to ensure proper resource release before removal.
• Enhanced Transaction Removal Logging: A new debug log message has been added to transCacheRemoveByRefId to provide clearer insights into transaction removal, including the reference ID and current reference count.
• Corrected Reference Release Logging: A debug log message in transCacheReleaseByRefId has been updated to accurately reflect a 'released' operation instead of 'acquire', improving log clarity.

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[gemini-code-assist]

Code Review

This pull request includes a logic fix and logging improvements. The reordering of transReleaseExHandle and transRemoveExHandle in trans.c is a good bug fix. The logging changes in transComm.c are also beneficial. I've added one comment regarding a minor race condition in a log message for improved correctness in a concurrent environment.

[gemini-code-assist]

There is a minor race condition in this logging. The reference count is decremented on the previous line, and then re-read here for the log message. In a highly concurrent environment, another thread could modify the reference count between these two operations, leading to a potentially misleading log message. To avoid this, it would be better to capture the return value of atomic_sub_fetch_32 and use it in this log message. For example:

const int32_t new_ref_count = atomic_sub_fetch_32(&transInstCache.tran[i].ref, 1);
tDebug("trans %p released by refId:%" PRId64 ", ref count:%d", transInstCache.tran[i].pTrans, refId, new_ref_count);