[
https://issues.apache.org/jira/browse/KAFKA-14729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17690151#comment-17690151
]
RivenSun commented on KAFKA-14729:
----------------------------------
Hi [~guozhang] , [~showuon]
Could you give some suggestions for this issue?
Thanks.
> The kafakConsumer pollForFetches(timer) method takes up a lot of cpu due to
> the abnormal exit of the heartbeat thread
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-14729
> URL: https://issues.apache.org/jira/browse/KAFKA-14729
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 3.3.0
> Reporter: RivenSun
> Assignee: RivenSun
> Priority: Major
> Attachments: image-2023-02-17-13-15-50-362.png, jstack_highCpu.txt
>
>
> h2. case situation:
> 1. The business program occupies a large amount of memory, causing the
> `run()` method of HeartbeatThread of kafkaConsumer to exit abnormally.
> {code:java}
> 2023-02-14 06:55:57.771[][ERROR][AbstractCoordinator][kafka-coor][Consumer
> clientId=consumer-5,
> groupId=asyncmq_local_us_dev-webcachesync_fcd02f8e-4f7e-4829-93ed-e8fa9cdc81f2_dev_VA]
> Heartbeat thread failed due to unexpected error java.lang.OutOfMemoryError:
> Java heap space {code}
> 2. The finally module of the heartbeat thread ` run()` method only prints the
> log, but does not update the value of `AbstractCoordinator.state`.
> 3. For kafkaConsumer with the groupRebalance mechanism enabled, in the
> `kafkaConsumer#pollForFetches(timer)` method, pollTimeout may eventually take
> the value `timeToNextHeartbeat(now)`.
> 4. Since the heartbeat thread has exited, `heartbeatTimer.deadlineMs` will
> never be updated again.
> And the `AbstractCoordinator.state` field value will always be {*}STABLE{*},
> So the `timeToNextHeartbeat(long now)` method will return
> {color:#ff0000}0{color}.
> 0 will be passed to the underlying `networkClient#poll` method.
>
> In the end, the user calls the `poll(duration)` method in an endless loop,
> and the `kafkaConsumer#pollForFetches(timer)` method will always return very
> quickly, taking up a lot of cpu.
>
> h2. solution:
> 1. Refer to the note of `MemberState.STABLE` :
> {code:java}
> the client has joined and is sending heartbeats.{code}
> When the heartbeat thread exits, in `finally` module, we should add code:
> {code:java}
> state = MemberState.UNJOINED;
> closed = true;{code}
> 2. In the `AbstractCoordinator#timeToNextHeartbeat(now)` method, add a new
> judgment condition: `heartbeatThread.hasFailed()`
> {code:java}
> if (state.hasNotJoinedGroup() || heartbeatThread.hasFailed())
> return Long.MAX_VALUE;
> return heartbeat.timeToNextHeartbeat(now);{code}
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
