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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8143) HBase on Hadoop 2 with local hort circuit reads (ssr) causes OOM
Date Tue, 19 Mar 2013 03:05:15 GMT
Enis Soztutar created HBASE-8143:
------------------------------------

             Summary: HBase on Hadoop 2 with local hort circuit reads (ssr) causes OOM 
                 Key: HBASE-8143
                 URL: https://issues.apache.org/jira/browse/HBASE-8143
             Project: HBase
          Issue Type: Bug
          Components: hadoop2
    Affects Versions: 0.95.0, 0.98.0, 0.94.7
            Reporter: Enis Soztutar
            Assignee: Enis Soztutar
             Fix For: 0.95.0, 0.98.0, 0.94.7


We've run into an issue with HBase 0.94 on Hadoop2, with SSR turned on that the memory usage
of the HBase process grows to 7g, on an -Xmx3g, after some time, this causes OOM for the RSs.


Upon further investigation, I've found out that we end up with 200 regions, each having 3-4
store files open. Under hadoop2 SSR, BlockReaderLocal allocates DirectBuffers, which is unlike
HDFS 1 where there is no direct buffer allocation. 

It seems that there is no guards against the memory used by local buffers in hdfs 2, and having
a large number of open files causes multiple GB of memory to be consumed from the RS process.


This issue is to further investigate what is going on. Whether we can limit the memory usage
in HDFS, or HBase, and/or document the setup. 

Possible mitigation scenarios are: 
 - Turn off SSR for Hadoop 2
 - Ensure that there is enough unallocated memory for the RS based on expected # of store
files
 - Ensure that there is lower number of regions per region server (hence number of open files)

Stack trace:
{code}
org.apache.hadoop.hbase.DroppedSnapshotException: region: IntegrationTestLoadAndVerify,yC^P\xD7\x945\xD4,1363388517630.24655343d8d356ef708732f34cfe8946.
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1560)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1439)
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1380)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:449)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushOneForGlobalPressure(MemStoreFlusher.java:215)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$500(MemStoreFlusher.java:63)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:237)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.OutOfMemoryError: Direct buffer memory
        at java.nio.Bits.reserveMemory(Bits.java:632)
        at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:97)
        at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:288)
        at org.apache.hadoop.hdfs.util.DirectBufferPool.getBuffer(DirectBufferPool.java:70)
        at org.apache.hadoop.hdfs.BlockReaderLocal.<init>(BlockReaderLocal.java:315)
        at org.apache.hadoop.hdfs.BlockReaderLocal.newBlockReader(BlockReaderLocal.java:208)
        at org.apache.hadoop.hdfs.DFSClient.getLocalBlockReader(DFSClient.java:790)
        at org.apache.hadoop.hdfs.DFSInputStream.getBlockReader(DFSInputStream.java:888)
        at org.apache.hadoop.hdfs.DFSInputStream.blockSeekTo(DFSInputStream.java:455)
        at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:645)
        at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:689)
        at java.io.DataInputStream.readFully(DataInputStream.java:178)
        at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.readFromStream(FixedFileTrailer.java:312)
        at org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion(HFile.java:543)
        at org.apache.hadoop.hbase.io.hfile.HFile.createReaderWithEncoding(HFile.java:589)
        at org.apache.hadoop.hbase.regionserver.StoreFile$Reader.<init>(StoreFile.java:1261)
        at org.apache.hadoop.hbase.regionserver.StoreFile.open(StoreFile.java:512)
        at org.apache.hadoop.hbase.regionserver.StoreFile.createReader(StoreFile.java:603)
        at org.apache.hadoop.hbase.regionserver.Store.validateStoreFile(Store.java:1568)
        at org.apache.hadoop.hbase.regionserver.Store.commitFile(Store.java:845)
        at org.apache.hadoop.hbase.regionserver.Store.access$500(Store.java:109)
        at org.apache.hadoop.hbase.regionserver.Store$StoreFlusherImpl.commit(Store.java:2209)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1541)
{code}

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