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From "Philip Thompson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-9938) Significant GC pauses
Date Thu, 30 Jul 2015 15:39:07 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-9938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Philip Thompson updated CASSANDRA-9938:
---------------------------------------
    Fix Version/s: 2.1.x

> Significant GC pauses
> ---------------------
>
>                 Key: CASSANDRA-9938
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9938
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Ubuntu 14.04, Java 1.8.0u45
>            Reporter: Robbie Strickland
>              Labels: gc
>             Fix For: 2.1.x
>
>         Attachments: gc_log.txt
>
>
> We have an 18-node analytics cluster, running 2.1.7 patched with CASSANDRA-9662.  On
a couple of the nodes we are seeing very long GC pauses, especially in old gen, and little
space is reclaimed.  Eventually these nodes OOM:
> {code}
> ERROR [SharedPool-Worker-167] 2015-07-30 00:36:20,746 JVMStabilityInspector.java:94 -
JVM state determined to be unstable.  Exiting forcefully due to: java.lang.OutOfMemoryError:
Java heap space
> {code}
> We use G1 with the following settings:
> Max heap = 16G
> New size = 1.6G
> +UseTLAB
> +ResizeTLAB
> +PerfDisableSharedMem
> -UseBiasedLocking
> The nodes in question have average load profiles for the cluster, and caches are disabled
on all tables.  There is no obvious difference with the problematic nodes, and no other clear
signs of trouble.  Unfortunately we're currently getting an assertion error when trying to
get a heap dump, or I would post that.



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