SammiChen created HDFS-12392:
--------------------------------

             Summary: Randomly read striped file failure
                 Key: HDFS-12392
                 URL: https://issues.apache.org/jira/browse/HDFS-12392
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: erasure-coding
    Affects Versions: 3.0.0-alpha3
            Reporter: SammiChen


Root cause: The buffer size returned by ElasticByteBufferPool.getBuffer() is 
more than caller expected.


Exception stack:
org.apache.hadoop.HadoopIllegalArgumentException: Invalid buffer, not of length 
4096

        at 
org.apache.hadoop.io.erasurecode.rawcoder.ByteBufferEncodingState.checkBuffers(ByteBufferEncodingState.java:99)
        at 
org.apache.hadoop.io.erasurecode.rawcoder.ByteBufferEncodingState.<init>(ByteBufferEncodingState.java:46)
        at 
org.apache.hadoop.io.erasurecode.rawcoder.RawErasureEncoder.encode(RawErasureEncoder.java:67)
        at 
org.apache.hadoop.hdfs.DFSStripedOutputStream.encode(DFSStripedOutputStream.java:368)
        at 
org.apache.hadoop.hdfs.DFSStripedOutputStream.writeParityCells(DFSStripedOutputStream.java:942)
        at 
org.apache.hadoop.hdfs.DFSStripedOutputStream.writeChunk(DFSStripedOutputStream.java:547)
        at 
org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunks(FSOutputSummer.java:217)
        at org.apache.hadoop.fs.FSOutputSummer.write1(FSOutputSummer.java:125)
        at org.apache.hadoop.fs.FSOutputSummer.write(FSOutputSummer.java:111)
        at 
org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:57)
        at java.io.DataOutputStream.write(DataOutputStream.java:107)
        at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:94)
        at org.apache.hadoop.hdfs.DFSTestUtil.writeFile(DFSTestUtil.java:834)



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