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https://issues.apache.org/jira/browse/CASSANDRA-8066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169740#comment-14169740
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T Jake Luciani commented on CASSANDRA-8066:
-------------------------------------------
bq. Do you need more details?
Yes actual data size and number of sstables in the largest keyspace
> 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
>
>
> 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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