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Posted to commits@cassandra.apache.org by "Ryan McGuire (JIRA)" <ji...@apache.org> on 2014/08/11 17:34:12 UTC
[jira] [Commented] (CASSANDRA-7743) Possible C* OOM issue during
long running test
[ https://issues.apache.org/jira/browse/CASSANDRA-7743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14092892#comment-14092892 ]
Ryan McGuire commented on CASSANDRA-7743:
-----------------------------------------
I'd recommend running [MAT|http://www.eclipse.org/mat/] on of the core files to be able to examine what exactly is eating up the ram. Although, I'm not sure if this helps with "Direct buffer memory" as I've only used it to debug things before we went off-heap.
> Possible C* OOM issue during long running test
> ----------------------------------------------
>
> Key: CASSANDRA-7743
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7743
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Google Compute Engine, n1-standard-1
> Reporter: Pierre Laporte
>
> During a long running test, we ended up with a lot of "java.lang.OutOfMemoryError: Direct buffer memory" errors on the Cassandra instances.
> Here is an example of stacktrace from system.log :
> {code}
> ERROR [SharedPool-Worker-1] 2014-08-11 11:09:34,610 ErrorMessage.java:218 - Unexpected exception during request
> java.lang.OutOfMemoryError: Direct buffer memory
> at java.nio.Bits.reserveMemory(Bits.java:658) ~[na:1.7.0_25]
> at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123) ~[na:1.7.0_25]
> at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:306) ~[na:1.7.0_25]
> at io.netty.buffer.PoolArena$DirectArena.newChunk(PoolArena.java:434) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:179) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.buffer.PoolArena.allocate(PoolArena.java:168) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.buffer.PoolArena.allocate(PoolArena.java:98) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:251) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:155) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:146) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:107) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.channel.AdaptiveRecvByteBufAllocator$HandleImpl.allocate(AdaptiveRecvByteBufAllocator.java:104) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:112) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:507) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:464) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:378) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:350) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) ~[netty-all-4.0.20.Final.jar:4.0.20.Final]
> at java.lang.Thread.run(Thread.java:724) ~[na:1.7.0_25]
> {code}
> The test consisted of a 3-nodes cluster of n1-standard-1 GCE instances (1 vCPU, 3.75 GB RAM) running cassandra-2.1.0-rc5, and a n1-standard-2 instance running the test.
> After ~2.5 days, several requests start to fail and we see the previous stacktraces in the system.log file.
> The output from linux ‘free’ and ‘meminfo’ suggest that there is still memory available.
> {code}
> $ free -m
> total used free shared buffers cached
> Mem: 3702 3532 169 0 161 854
> -/+ buffers/cache: 2516 1185
> Swap: 0 0 0
> $ head -n 4 /proc/meminfo
> MemTotal: 3791292 kB
> MemFree: 173568 kB
> Buffers: 165608 kB
> Cached: 874752 kB
> {code}
> These errors do not affect all the queries we run. The cluster is still responsive but is unable to display tracing information using cqlsh :
> {code}
> $ ./bin/nodetool --host 10.240.137.253 status duration_test
> Datacenter: DC1
> ===============
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> -- Address Load Tokens Owns (effective) Host ID Rack
> UN 10.240.98.27 925.17 KB 256 100.0% 41314169-eff5-465f-85ea-d501fd8f9c5e RAC1
> UN 10.240.137.253 1.1 MB 256 100.0% c706f5f9-c5f3-4d5e-95e9-a8903823827e RAC1
> UN 10.240.72.183 896.57 KB 256 100.0% 15735c4d-98d4-4ea4-a305-7ab2d92f65fc RAC1
> $ echo 'tracing on; select count(*) from duration_test.ints;' | ./bin/cqlsh 10.240.137.253
> Now tracing requests.
> count
> -------
> 9486
> (1 rows)
> Statement trace did not complete within 10 seconds
> {code}
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