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https://issues.apache.org/jira/browse/IMPALA-13130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18073521#comment-18073521
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ASF subversion and git services commented on IMPALA-13130:
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Commit 49ddba704f1eec308d276f9568e7564918677258 in impala's branch
refs/heads/master from Michael Smith
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=49ddba704 ]
IMPALA-13164: Expose more KRPC metrics
Exposes Kudu RPC metrics that are already collected through the rpcz
JSON page: reactor_active_latency, reactor_load_percent, and
rpcs_timed_out_in_queue.
Reactor activity and load can help identify when reactor threads are a
bottleneck on RPC performance. Timed out RPCs could happen after
IMPALA-13130; a non-zero value would signify lost EndDataStream messages
reflecting significant problems in RPC flow in the environment.
Adds deserialization-queue-size and deserialization-queue-wait-time to
datastream-manager metrics to help identify when RPC deserialization is
slow and could benefit from increasing
datastream_service_num_deserialization_threads or the queue size.
Implements FunctionGauge to provide access to a thread-safe getter
providing the relevant metric.
Generated-by: Github Copilot (Claude Sonnet 4.6, GPT-5.3-Codex)
Change-Id: I62106bbab2b9290f0d5f456d4bb30005a5261524
Reviewed-on: http://gerrit.cloudera.org:8080/24179
Reviewed-by: Alexey Serbin <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
Reviewed-by: Michael Smith <[email protected]>
> Under heavy load, Impala does not prioritize data stream operations
> -------------------------------------------------------------------
>
> Key: IMPALA-13130
> URL: https://issues.apache.org/jira/browse/IMPALA-13130
> Project: IMPALA
> Issue Type: Bug
> Reporter: Michael Smith
> Assignee: Michael Smith
> Priority: Critical
> Fix For: Impala 4.5.0, Impala 4.4.1
>
>
> Under heavy load - where Impala reaches max memory for the DataStreamService
> and applies backpressure via
> https://github.com/apache/impala/blob/4.4.0/be/src/rpc/impala-service-pool.cc#L191-L199
> - DataStreamService does not differentiate between types of requests and may
> reject requests that could help reduce load.
> The DataStreamService deals with TransmitData, PublishFilter, UpdateFilter,
> UpdateFilterFromRemote, and EndDataStream. It seems like we should prioritize
> completing EndDataStream, especially under heavy load, to complete work and
> release resources more quickly.
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