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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8066) High Heap Consumption due to high number of SSTableReader
Date Mon, 13 Oct 2014 20:48:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169938#comment-14169938
] 

Jason Brown commented on CASSANDRA-8066:
----------------------------------------

+1

> High Heap Consumption due to high number of SSTableReader
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-8066
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8066
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Cassandra 2.1.0
>            Reporter: Benoit Lacelle
>            Assignee: T Jake Luciani
>             Fix For: 2.1.1
>
>         Attachments: 8066.txt
>
>
> Given a workload with quite a lot of reads, I recently encountered high heap memory consumption.
Given 2GB of Heap, it appears I have 750.000+ tasks in SSTableReader.syncExecutor, consuming
more than 1.2GB. These tasks have type SSTableReader$5, which I guess corresponds to :
> {code}
> readMeterSyncFuture = syncExecutor.scheduleAtFixedRate(new Runnable()
> {
> public void run()
> {
> if (!isCompacted.get())
> {
> meterSyncThrottle.acquire();
> SystemKeyspace.persistSSTableReadMeter(desc.ksname, desc.cfname, desc.generation, readMeter);
> }
> }
> }, 1, 5, TimeUnit.MINUTES);
> {code}
> I do not have have to the environment right now, but I could provide a threaddump later
if necessary.



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