Benoit Lacelle created CASSANDRA-8066:
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Summary: 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
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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