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From "Benoit Lacelle (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-8066) High Heap Consumption due to high number of SSTableReader
Date Tue, 07 Oct 2014 07:39:33 GMT
Benoit Lacelle created CASSANDRA-8066:

             Summary: High Heap Consumption due to high number of SSTableReader
                 Key: CASSANDRA-8066
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: Cassandra 2.1.0
            Reporter: Benoit Lacelle

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 :

readMeterSyncFuture = syncExecutor.scheduleAtFixedRate(new Runnable()
public void run()
if (!isCompacted.get())
SystemKeyspace.persistSSTableReadMeter(desc.ksname, desc.cfname, desc.generation, readMeter);
}, 1, 5, TimeUnit.MINUTES);

I do not have have to the environment right now, but I could provide a threaddump later if

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