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From Ran Tavory <ran...@gmail.com>
Subject Re: OOM when running hector's unit tests at 0.7.0
Date Sat, 18 Sep 2010 19:02:22 GMT
I haven't tried the python tests. What's also interesting is that if I
run a single java test case then there's no oom. Only when I run the
entire class then I get it. Also if I ads random sleeps then there is
no oom but other more interesting errors surface.

On Saturday, September 18, 2010, Nate McCall <nate@riptano.com> wrote:
> Ran, have you tried to reproduce this using cassandra's python system
> tests? Those have coverage of the system methods as well.
>
> On 9/18/10, Nate McCall <nate@riptano.com> wrote:
>> 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

-- 
/Ran

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