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From "huxihx (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6777) Wrong reaction on Out Of Memory situation
Date Thu, 12 Apr 2018 23:02:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16436445#comment-16436445
] 

huxihx commented on KAFKA-6777:
-------------------------------

A possible way is to diagnose the GC logs to see why it spent so much CPU time to do the collecting.
What's the gc collector you use? throughput gc or G1?

> Wrong reaction on Out Of Memory situation
> -----------------------------------------
>
>                 Key: KAFKA-6777
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6777
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.0.0
>            Reporter: Seweryn Habdank-Wojewodzki
>            Priority: Critical
>         Attachments: screenshot-1.png
>
>
> Dears,
> We already encountered many times problems related to Out Of Memory situation in Kafka
Broker and streaming clients.
> The scenario is the following.
> When Kafka Broker (or Streaming Client) is under load and has too less memory, there
are no errors in server logs. One can see some cryptic entries in GC logs, but they are definitely
not self-explaining.
> Kafka Broker (and Streaming Clients) works further. Later we see in JMX monitoring, that
JVM uses more and more time in GC. In our case it grows from e.g. 1% to 80%-90% of CPU time
is used by GC.
> Next, software collapses into zombie mode – process in not ending. In such a case I
would expect, that process is crashing (e.g. got SIG SEGV). Even worse Kafka treats such a
zombie process normal and somewhat sends messages, which are in fact getting lost, also the
cluster is not excluding broken nodes. The question is how to configure Kafka to really terminate
the JVM and not remain in zombie mode, to give a chance to other nodes to know, that something
is dead.
> I would expect that in Out Of Memory situation JVM is ended if not graceful than at least
process is crashed.



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