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From Nate McCall <n...@riptano.com>
Subject Re: OOM when running hector's unit tests at 0.7.0
Date Sat, 18 Sep 2010 18:36:49 GMT
An additional point - we just added the system_* methods and this test
class does an add, rename then drop for both CF and keyspace.

On 9/18/10, Ran Tavory <rantav@gmail.com> wrote:
> I started seeing OOM when running hector's unit-tests on 0.7.0. The OOM is
> in cassandra's code so either there had been recent changes within cassandra
> or it's just that we added new coverage which causes this OOM.
>
> On my mac it's 100% repro but other hector devs have reported they don't get
> this OOM. Moreover, it I place a Thread.sleep(5000) in one of the tests the
> OOM goes away (but other errors are still present see more below)
>
> To reproduce the error you may checkout hector from
> http://github.com/rantav/hector, switch to the 0.7.0 branch and run:
>
> $ MAVEN_OPTS="-Xmx1G -Xms256M -XX:+UseParNewGC -XX:+UseConcMarkSweepGC
> -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=8
> -XX:MaxTenuringThreshold=1" *mvn test -Dtest=CassandraClusterTest*
>
> (I'm using the default memory settings from 0.7.0)
>
> The test class source code is here
> http://github.com/rantav/hector/blob/0.7.0/src/test/java/me/prettyprint/cassandra/service/CassandraClusterTest.java
>
> This test basically adds, removes, renames keyspaces etc.
>
> Here's the OOM log:
>
> 18:07:04,197  INFO ColumnFamilyStore:734 - Enqueuing flush of
> Memtable-Schema@72177013(3455 bytes, 3 operations)
> 18:07:04,487 ERROR AbstractCassandraDaemon:88 - Fatal exception in thread
> Thread[FLUSH-WRITER-POOL:1,5,main]
> java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: Java
> heap space
> at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
>  at java.util.concurrent.FutureTask.get(FutureTask.java:83)
> at
> org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:87)
>  at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>  at java.lang.Thread.run(Thread.java:637)
> Caused by: java.lang.OutOfMemoryError: Java heap space
> at
> org.apache.cassandra.io.util.BufferedRandomAccessFile.init(BufferedRandomAccessFile.java:151)
>  at
> org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:144)
> at
> org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:61)
>  at org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:151)
> at org.apache.cassandra.db.Memtable.access$000(Memtable.java:44)
>  at org.apache.cassandra.db.Memtable$1.runMayThrow(Memtable.java:168)
> at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
>  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>  ... 2 more
> 18:07:04,491  INFO Memtable:150 - Writing Memtable-Schema@72177013(3455
> bytes, 3 operations)
> 18:07:04,812  INFO CompactionManager:323 - Compacted to
> /Users/ran/dev/cassandra/hector/tmp/var/lib/cassandra/data/system/Schema-tmp-e-6-Data.db.
>  15,707 to 15,173 (~96% of original) bytes for 5 keys.  Time: 860ms.
> 18:07:04,812 ERROR AbstractCassandraDaemon:88 - Fatal exception in thread
> Thread[FLUSH-WRITER-POOL:1,5,main]
> java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: Java
> heap space
> at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
>  at java.util.concurrent.FutureTask.get(FutureTask.java:83)
> at
> org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:87)
>  at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>  at java.lang.Thread.run(Thread.java:637)
> Caused by: java.lang.OutOfMemoryError: Java heap space
> at
> org.apache.cassandra.io.util.BufferedRandomAccessFile.init(BufferedRandomAccessFile.java:151)
>  at
> org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:144)
> at
> org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:61)
>  at org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:151)
> at org.apache.cassandra.db.Memtable.access$000(Memtable.java:44)
>  at org.apache.cassandra.db.Memtable$1.runMayThrow(Memtable.java:168)
> at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
>  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>  ... 2 more
>
>
> Here the log after I place a sleep(5000) at this line
> http://github.com/rantav/hector/blob/0.7.0/src/test/java/me/prettyprint/cassandra/service/CassandraClusterTest.java#L88
> The file-not-found error is even more suspicious...
>
> 18:04:28,293 ERROR AbstractCassandraDaemon:88 - Fatal exception in thread
> Thread[CompactionExecutor:1,1,main]
> java.util.concurrent.ExecutionException: java.io.FileNotFoundException:
> /Users/ran/dev/cassandra/hector/tmp/var/lib/cassandra/data/system/Schema-tmp-e-7-Filter.db
> (No such file or directory)
>  at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
> at java.util.concurrent.FutureTask.get(FutureTask.java:83)
>  at
> org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:87)
> at
> org.apache.cassandra.db.CompactionManager$CompactionExecutor.afterExecute(CompactionManager.java:604)
>  at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>  at java.lang.Thread.run(Thread.java:637)
> Caused by: java.io.FileNotFoundException:
> /Users/ran/dev/cassandra/hector/tmp/var/lib/cassandra/data/system/Schema-tmp-e-7-Filter.db
> (No such file or directory)
>  at java.io.FileOutputStream.open(Native Method)
> at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
>  at java.io.FileOutputStream.<init>(FileOutputStream.java:70)
> at
> org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.close(SSTableWriter.java:382)
>  at
> org.apache.cassandra.io.sstable.SSTableWriter.closeAndOpenReader(SSTableWriter.java:144)
> at
> org.apache.cassandra.db.CompactionManager.doCompaction(CompactionManager.java:314)
>  at
> org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:107)
> at
> org.apache.cassandra.db.CompactionManager$1.call(CompactionManager.java:88)
>  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>  at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> ... 2 more
>
>
> $ java -version
> java version "1.6.0_20"
> Java(TM) SE Runtime Environment (build 1.6.0_20-b02-279-9M3165)
> Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01-279, mixed mode)
>

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