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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-5748) When flushing, nodes spent almost 100% in
Date Fri, 12 Jul 2013 13:49:49 GMT


Sylvain Lebresne resolved CASSANDRA-5748.

    Resolution: Duplicate

This is a duplicate of CASSANDRA-5677. It will get fixed there.
> When flushing, nodes spent almost 100% in
> -----------------------------------------------------------------------
>                 Key: CASSANDRA-5748
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.2.5, 1.2.6
>         Environment: Apache Cassandra v1.2.6
> 4-node cluster, mostly the same hardware
> # java -version
> java version "1.6.0_37"
> Java(TM) SE Runtime Environment (build 1.6.0_37-b06)
> Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01, mixed mode)
>            Reporter: Chris Eineke
>            Priority: Critical
>         Attachments: thread_dump
> We're pretty heavy users of CQL3 and CQL3 collection types. Occasionally, some nodes
of the cluster will become extremely sluggish and the cluster as a whole starts to become
unresponsive, reads will time out, and nodes will drop mutation messages. This happens when
nodes flush Memtables to disk (based on my tail of the system.log on each node).
> I'm a curious guy, so I attached jvisualvm (v1.3.3) to the JVMs that were having this
problem. These nodes are spending up to 98% of CPU in
I will attach a thread dump.
> Thi is causing us quite a headache, because we're unable to figure what would be causing
this. We tried tuning several configuration settings (column cache size, row key cache size),
but the cluster exhibits the same issues even with the default configuration (except for a
modified num_tokens and listen_address).

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