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From "Robin Tweedie (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-6199) Single broker with fast growing heap usage
Date Wed, 06 Dec 2017 17:15:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-6199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robin Tweedie updated KAFKA-6199:
---------------------------------
    Attachment: histo_live_20171206.txt

Here is today's heap histogram as the broker got close to 75% heap.

With 4GB the heap does take about twice as long to get to this sort of usage.

> Single broker with fast growing heap usage
> ------------------------------------------
>
>                 Key: KAFKA-6199
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6199
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.10.2.1
>         Environment: Amazon Linux
>            Reporter: Robin Tweedie
>         Attachments: Screen Shot 2017-11-10 at 1.55.33 PM.png, Screen Shot 2017-11-10
at 11.59.06 AM.png, dominator_tree.png, histo_live.txt, histo_live_20171206.txt, histo_live_80.txt,
merge_shortest_paths.png, path2gc.png
>
>
> We have a single broker in our cluster of 25 with fast growing heap usage which necessitates
us restarting it every 12 hours. If we don't restart the broker, it becomes very slow from
long GC pauses and eventually has {{OutOfMemory}} errors.
> See {{Screen Shot 2017-11-10 at 11.59.06 AM.png}} for a graph of heap usage percentage
on the broker. A "normal" broker in the same cluster stays below 50% (averaged) over the same
time period.
> We have taken heap dumps when the broker's heap usage is getting dangerously high, and
there are a lot of retained {{NetworkSend}} objects referencing byte buffers.
> We also noticed that the single affected broker logs a lot more of this kind of warning
than any other broker:
> {noformat}
> WARN Attempting to send response via channel for which there is no open connection, connection
id 13 (kafka.network.Processor)
> {noformat}
> See {{Screen Shot 2017-11-10 at 1.55.33 PM.png}} for counts of that WARN log message
visualized across all the brokers (to show it happens a bit on other brokers, but not nearly
as much as it does on the "bad" broker).
> I can't make the heap dumps public, but would appreciate advice on how to pin down the
problem better. We're currently trying to narrow it down to a particular client, but without
much success so far.
> Let me know what else I could investigate or share to track down the source of this leak.



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