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From Todd Lipcon <t...@cloudera.com>
Subject Re: HBASE-4107 and OOME
Date Mon, 31 Oct 2011 01:01:43 GMT
On Sun, Oct 30, 2011 at 5:53 PM, Vladimir Rodionov
<vrodionov@carrieriq.com> wrote:
> Yes, mslab is enabled. It allocates 2M per region, by default? It can explain 2.4G of
heap usage (1277 regions)
> We fixed OOME by increasing Heap to 8G. Now I know that we can decrease slab size and
get back to 4G.

Yep. You can decrease slab size or disable MSLAB entirely. Or consider
having fewer, larger regions per server.

-Todd
>
> ________________________________________
> From: Todd Lipcon [todd@cloudera.com]
> Sent: Sunday, October 30, 2011 5:12 PM
> To: dev@hbase.apache.org
> Subject: Re: HBASE-4107 and OOME
>
> Hi Vladimir,
>
> Do you have MSLAB enabled? My guess is with 1000 regions you're seeing
> a lot of memory usage from MSLAB. Can you try the patch from
> HBASE-3680 to see what the "wasted memory" from MSLABs are?
>
> -Todd
>
> On Sun, Oct 30, 2011 at 4:54 PM, Vladimir Rodionov
> <vrodionov@carrieriq.com> wrote:
>>
>> We have observing frequent OOME during test load on a small cluster (15 nodes), but
the number of regions is
>> quite high (~1K per region server)
>>
>> It seems that we are hitting constantly HBASE-4107 bug.
>>
>> 2011-10-29 07:23:19,963 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new
compressor
>> 2011-10-29 07:23:23,171 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: LRU
Stats: total=30.07 MB, free=764.53 MB, max=794.6 MB, blocks=418, accesses=198528211, hits=196714784,
hitRatio=99.08%%, cachingAccesses=196715094, cachingHits=196714676, cachingHitsRatio=99.99%%,
evictions=0, evicted=0, evictedPerRun=NaN
>> 2011-10-29 07:23:55,858 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new
compressor
>> 2011-10-29 07:26:43,776 FATAL org.apache.hadoop.hbase.regionserver.wal.HLog: Could
not append. Requesting close of hlog
>> java.io.IOException: Reflection
>>        at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:147)
>>        at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:1002)
>>        at org.apache.hadoop.hbase.regionserver.wal.HLog$LogSyncer.run(HLog.java:979)
>> Caused by: java.lang.reflect.InvocationTargetException
>>        at sun.reflect.GeneratedMethodAccessor36.invoke(Unknown Source)
>>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>        at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:145)
>>        ... 2 more
>> Caused by: java.lang.OutOfMemoryError: Java heap space
>>        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$Packet.<init>(DFSClient.java:2204)
>>        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.writeChunk(DFSClient.java:3086)
>>        at org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunk(FSOutputSummer.java:150)
>>        at org.apache.hadoop.fs.FSOutputSummer.flushBuffer(FSOutputSummer.java:132)
>>        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.sync(DFSClient.java:3169)
>>        at org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:97)
>>        at org.apache.hadoop.io.SequenceFile$Writer.syncFs(SequenceFile.java:944)
>>        ... 6 more
>> 2011-10-29 07:26:43,809 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new
compressor
>>
>> The most interesting part is heap dump analysis:
>>
>> Heap Size = 4G
>>
>> byte[] consume 86% of heap
>> 68% of overall Heap is accessible from MemStore instances
>> MemStore-> KeyValueSkipListSet -> ConcurrentSkip
>>
>> I am not saying that this is a memory leak but taking into account that MemStore
default size is 40% of 4G = 1.6G
>> 68% looks very suspicious.
>>
>>
>> Best regards,
>> Vladimir Rodionov
>> Principal Platform Engineer
>> Carrier IQ, www.carrieriq.com
>> e-mail: vrodionov@carrieriq.com
>>
>> ________________________________________
>> From: Ted Yu [yuzhihong@gmail.com]
>> Sent: Saturday, October 29, 2011 3:56 PM
>> To: dev@hbase.apache.org
>> Subject: test failure due to missing baseznode
>>
>> If you happen to see test failure similar to the following:
>> https://builds.apache.org/job/PreCommit-HBASE-Build/99//testReport/org.apache.hadoop.hbase.mapreduce/TestLoadIncrementalHFilesSplitRecovery/testBulkLoadPhaseRecovery/
>>
>> Please go over https://issues.apache.org/jira/browse/HBASE-4253
>>
>> and apply similar fix as the following:
>> https://issues.apache.org/jira/secure/attachment/12491621/HBASE-4253.patch
>>
>> Cheers
>>
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>>
>
>
>
> --
> Todd Lipcon
> Software Engineer, Cloudera
>
> Confidentiality Notice:  The information contained in this message, including any attachments
hereto, may be confidential and is intended to be read only by the individual or entity to
whom this message is addressed. If the reader of this message is not the intended recipient
or an agent or designee of the intended recipient, please note that any review, use, disclosure
or distribution of this message or its attachments, in any form, is strictly prohibited.  If
you have received this message in error, please immediately notify the sender and/or Notifications@carrieriq.com
and delete or destroy any copy of this message and its attachments.
>



-- 
Todd Lipcon
Software Engineer, Cloudera

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