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Posted to dev@pig.apache.org by "Eugene Koontz (JIRA)" <ji...@apache.org> on 2013/02/22 03:33:12 UTC
[jira] [Updated] (PIG-3208) [zebra] TFile should not set
io.compression.codec.lzo.buffersize
[ https://issues.apache.org/jira/browse/PIG-3208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eugene Koontz updated PIG-3208:
-------------------------------
Attachment: PIG-3208.patch
Removes the two cases where {{io.compression.codec.lzo.buffersize}} is set to 64*1024.
> [zebra] TFile should not set io.compression.codec.lzo.buffersize
> ----------------------------------------------------------------
>
> Key: PIG-3208
> URL: https://issues.apache.org/jira/browse/PIG-3208
> Project: Pig
> Issue Type: Bug
> Reporter: Eugene Koontz
> Assignee: Eugene Koontz
> Attachments: PIG-3208.patch
>
>
> In contrib/zebra/src/java/org/apache/hadoop/zebra/tfile/Compression.java, the following occurs:
> {code}
> conf.setInt("io.compression.codec.lzo.buffersize", 64 * 1024);
> {code}
> This can cause the LZO decompressor, if called within the context of reading TFiles, to return with an error code when trying to uncompress LZO-compressed data, if the data's compressed size is too large to fit in 64 * 1024 bytes.
> For example, the Hadoop-LZO code uses a different default value (256 * 1024):
> https://github.com/twitter/hadoop-lzo/blob/master/src/java/com/hadoop/compression/lzo/LzoCodec.java#L185
> This can lead to a case where, if data is compressed with a cluster where the default {{io.compression.codec.lzo.buffersize}} = 256*1024 is used, then code that tries to read this data by using Pig's zebra, the Mapper will exit with code 134 because the LZO compressor returns a -4 (which encodes the LZO C library error LZO_E_INPUT_OVERRUN) when trying to uncompress the data. The stack trace of such a case is shown below:
> {code}
> 2013-02-17 14:47:50,709 INFO com.hadoop.compression.lzo.LzoCodec: Creating stream for compressor: com.hadoop.compression.lzo.LzoCompressor@6818c458 with bufferSize: 262144
> 2013-02-17 14:47:50,849 INFO org.apache.hadoop.io.compress.CodecPool: Paying back codec: com.hadoop.compression.lzo.LzoCompressor@6818c458
> 2013-02-17 14:47:50,849 INFO org.apache.hadoop.mapred.MapTask: Finished spill 3
> 2013-02-17 14:47:50,857 INFO org.apache.hadoop.io.compress.CodecPool: Borrowing codec: com.hadoop.compression.lzo.LzoCompressor@6818c458
> 2013-02-17 14:47:50,866 INFO com.hadoop.compression.lzo.LzoCodec: Creating stream for compressor: com.hadoop.compression.lzo.LzoCompressor@6818c458 with bufferSize: 262144
> 2013-02-17 14:47:50,879 INFO org.apache.hadoop.io.compress.CodecPool: Paying back codec: com.hadoop.compression.lzo.LzoCompressor@6818c458
> 2013-02-17 14:47:50,879 INFO org.apache.hadoop.mapred.MapTask: Finished spill 4
> 2013-02-17 14:47:50,887 INFO org.apache.hadoop.mapred.Merger: Merging 5 sorted segments
> 2013-02-17 14:47:50,890 INFO org.apache.hadoop.io.compress.CodecPool: Borrowing codec: com.hadoop.compression.lzo.LzoDecompressor@66a23610
> 2013-02-17 14:47:50,891 INFO com.hadoop.compression.lzo.LzoDecompressor: calling decompressBytesDirect with buffer with: position: 0 and limit: 262144
> 2013-02-17 14:47:50,891 INFO com.hadoop.compression.lzo.LzoDecompressor: read: 245688 bytes from decompressor.
> 2013-02-17 14:47:50,891 INFO org.apache.hadoop.io.compress.CodecPool: Borrowing codec: com.hadoop.compression.lzo.LzoDecompressor@43684706
> 2013-02-17 14:47:50,892 INFO com.hadoop.compression.lzo.LzoDecompressor: calling decompressBytesDirect with buffer with: position: 0 and limit: 65536
> 2013-02-17 14:47:50,895 INFO org.apache.hadoop.mapred.TaskLogsTruncater: Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1
> 2013-02-17 14:47:50,897 FATAL org.apache.hadoop.mapred.Child: Error running child : java.lang.InternalError: lzo1x_decompress returned: -4
> at com.hadoop.compression.lzo.LzoDecompressor.decompressBytesDirect(Native Method)
> at com.hadoop.compression.lzo.LzoDecompressor.decompress(LzoDecompressor.java:307)
> at org.apache.hadoop.io.compress.BlockDecompressorStream.decompress(BlockDecompressorStream.java:82)
> at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:75)
> at org.apache.hadoop.mapred.IFile$Reader.readData(IFile.java:341)
> at org.apache.hadoop.mapred.IFile$Reader.rejigData(IFile.java:371)
> at org.apache.hadoop.mapred.IFile$Reader.readNextBlock(IFile.java:355)
> at org.apache.hadoop.mapred.IFile$Reader.next(IFile.java:387)
> at org.apache.hadoop.mapred.Merger$Segment.next(Merger.java:220)
> at org.apache.hadoop.mapred.Merger$MergeQueue.merge(Merger.java:420)
> at org.apache.hadoop.mapred.Merger$MergeQueue.merge(Merger.java:381)
> at org.apache.hadoop.mapred.Merger.merge(Merger.java:77)
> at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:1548)
> at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1180)
> at org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:582)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:649)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:323)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1213)
> at org.apache.hadoop.mapred.Child.main(Child.java:264)
> {code}
> (Some additional LOG.info statements were added to produce the above output which are not in this patch).
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