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From "Paul Guo (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAWQ-1077) QE process spins due to an bug in ao snappy code
Date Mon, 26 Sep 2016 08:42:20 GMT
Paul Guo created HAWQ-1077:
------------------------------

             Summary: QE process spins due to an bug in ao snappy code
                 Key: HAWQ-1077
                 URL: https://issues.apache.org/jira/browse/HAWQ-1077
             Project: Apache HAWQ
          Issue Type: Bug
            Reporter: Paul Guo
            Assignee: Lei Chang


Found this issue during testing. Tthe query has never ended during tests. After quick check,
we found that QE process spins and further gdb debugging shows that it is because of a ao
snappy code which leads to stack overwrite.

The stack is similar to this:

#0  0x00000000008607c4 in gp_trycompress_new (sourceData=0x2eec5b0 "\340\352\356\002", sourceLen=0,
    compressedBuffer=0xa2b3b4 "\311\303UH\211\345H\211}\370H\213E\370\307@<", compressedBufferWithOverrrunLen=38253,
    maxCompressedLen=32767, compressedLen=0xf8c800a29636, compressLevel=0, compressor=0x5d9cdf
<snappy_compress_internal>,
    compressionState=0x2eee690) at gp_compress.c:56
#1  0x0000000000a2a1c6 in AppendOnlyStorageWrite_CompressAppend (storageWrite=0x2eec558,
    sourceData=0x33efa68 "ata value for text data typelarge data value for text data typelarge
data value for text data typelarge data value for text data typelarge data value for text
data typelarge data value for text data t"..., sourceLen=0,
    executorBlockKind=2, itemCount=0, compressedLen=0x7fffa7804f74, bufferLen=0x7fffa7804f70)
at cdbappendonlystoragewrite.c:1255
#2  0x0000000000a2ae1b in AppendOnlyStorageWrite_Content (storageWrite=0x2eec558, content=0x33e7a70
"\242\241:\200\351\003",
    contentLen=3842464, executorBlockKind=2, rowCount=1) at cdbappendonlystoragewrite.c:1868
#3  0x000000000056b805 in appendonly_insert (aoInsertDesc=0x2eec460, instup=0x33e7a70, tupleOid=0x7fffa7805094,
    aoTupleId=0x7fffa7805080) at appendonlyam.c:2030



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