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From "mlowicki (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9681) Memtable heap size grows and many long GC pauses are triggered
Date Tue, 30 Jun 2015 13:35:04 GMT


mlowicki commented on CASSANDRA-9681:

Sure, just let me know and we'll try to apply the patch.

> Memtable heap size grows and many long GC pauses are triggered
> --------------------------------------------------------------
>                 Key: CASSANDRA-9681
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: C* 2.1.7, Debian Wheezy
>            Reporter: mlowicki
>            Assignee: Benedict
>            Priority: Critical
>             Fix For: 2.1.x
>         Attachments: cassandra.yaml, db5.system.log,,,, schema.cql,,,,
> C* 2.1.7 cluster is behaving really bad after 1-2 days. {{}}
jumps to 7 GB (
on 3/6 nodes in each data center and then there are many long GC pauses. Cluster is using
default heap size values ({{-Xms8192M -Xmx8192M -Xmn2048M}})
> Before C* 2.1.5 memtables heap size was basically constant ~500MB (
> After restarting all nodes is behaves stable for 1-2days. Today I've done that and long
GC pauses are gone (~18:00
The only pattern we've found so far is that long GC  pauses are happening basically at the
same time on all nodes in the same data center - even on the ones where memtables heap size
is not growing.
> Cliffs on the graphs are nodes restarts.
> Used memory on boxes where {{AllMemtabelesHeapSize}} grows, stays at the same level -
> Replication factor is set to 3.

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