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https://issues.apache.org/jira/browse/HBASE-8143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803180#comment-13803180
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stack commented on HBASE-8143:
------------------------------
bq. Now thinking about it, will this override the conf set in hdfs-site.xml? If
so, maybe we should custom code it in our dfs client layer.
How would you suggest it work Enis?
Read the configuration, if it is the default, set it to the hbase value (the
hbase value would have to be named something else)? What if it is not the
default and still too large or if the default value changes (we can't read
hdfs-side configs)? There is no hdfs-site.xml on serverside in most deploys,
right?
> HBase on Hadoop 2 with local short 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: 0.98.0, 0.94.7, 0.95.0
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Priority: Critical
> Fix For: 0.98.0, 0.96.1
>
> Attachments: 8143doc.txt, 8143.hbase-default.xml.txt,
> OpenFileTest.java
>
>
> 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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