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From Salabhanjika S <salabhanji...@gmail.com>
Subject Re: Region server slowdown
Date Fri, 14 Mar 2014 08:17:59 GMT
Thanks for quick response Ted.

- Hadoop version is 0.20.2
- Other previous flushes (600MB to 1.5GB) takes around 60 to 300 seconds

On Fri, Mar 14, 2014 at 1:21 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> What Hadoop version are you using ?
>
> Btw, the sentence about previous flushes was incomplete.
>
> Cheers
>
> On Mar 14, 2014, at 12:12 AM, Salabhanjika S <salabhanjika9@gmail.com> wrote:
>
>> Devs,
>>
>> We are using hbase version 0.90.6 (please don't complain of old
>> version. we are in process of upgrading) in our production and we are
>> noticing a strange problem arbitrarily for every few weeks. Region
>> server goes extremely slow.
>> We have to restart Region Server once this happens. There is no unique
>> pattern of this problem. This happens on different region servers,
>> different tables/regions and different times.
>>
>> Here are observations & findings from our analysis.
>> - We are using LZO compression (0.4.10).
>>
>> - [RS Dashboard] Flush is running for more than 6 hours. It is in
>> "creating writer" status for long time. Other previous flushes (600MB
>> to 1.5GB) takes
>>
>> - [Thread dumps] No deadlocks. Flusher thread stack. Even compactor
>> thread is in same state Configuration.loadResource
>> "regionserver60020.cacheFlusher" daemon prio=10 tid=0x00007efd016c4800
>> nid=0x35e9 runnable [0x00007efcad9c5000]
>>   java.lang.Thread.State: RUNNABLE
>>    at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:70)
>>    at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:161)
>>    - locked <0x00007f02ccc2ef78> (a
>> sun.net.www.protocol.file.FileURLConnection)
>>    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:653)
>>    ... [cutting down some stack to keep mail compact. all this stack
>> is in com.sun.org.apache.xerces...]
>>    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)
>>    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:180)
>>    at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1308)
>>    at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:1259)
>>    at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:1200)
>>    - locked <0x00007f014f1543b8> (a org.apache.hadoop.conf.Configuration)
>>    at org.apache.hadoop.conf.Configuration.get(Configuration.java:501)
>>    at com.hadoop.compression.lzo.LzoCodec.getCompressionStrategy(LzoCodec.java:205)
>>    at com.hadoop.compression.lzo.LzoCompressor.reinit(LzoCompressor.java:204)
>>    at org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:105)
>>    at org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:112)
>>    at org.apache.hadoop.hbase.io.hfile.Compression$Algorithm.getCompressor(Compression.java:236)
>>    at org.apache.hadoop.hbase.io.hfile.HFile$Writer.getCompressingStream(HFile.java:397)
>>    at org.apache.hadoop.hbase.io.hfile.HFile$Writer.newBlock(HFile.java:383)
>>    at org.apache.hadoop.hbase.io.hfile.HFile$Writer.checkBlockBoundary(HFile.java:354)
>>    at org.apache.hadoop.hbase.io.hfile.HFile$Writer.append(HFile.java:536)
>>    at org.apache.hadoop.hbase.io.hfile.HFile$Writer.append(HFile.java:501)
>>    at org.apache.hadoop.hbase.regionserver.StoreFile$Writer.append(StoreFile.java:836)
>>    at org.apache.hadoop.hbase.regionserver.Store.internalFlushCache(Store.java:530)
>>    - locked <0x00007efe1b6e7af8> (a java.lang.Object)
>>    at org.apache.hadoop.hbase.regionserver.Store.flushCache(Store.java:496)
>>    at org.apache.hadoop.hbase.regionserver.Store.access$100(Store.java:83)
>>    at org.apache.hadoop.hbase.regionserver.Store$StoreFlusherImpl.flushCache(Store.java:1576)
>>    at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1046)
>>    at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:967)
>>    at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:915)
>>    at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:394)
>>    at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:368)
>>    at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:242)
>>
>> Any leads on this please?
>>
>> -S

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