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From "John Zhuge (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12990) lz4 incompatibility between OS and Hadoop
Date Fri, 01 Apr 2016 15:43:25 GMT
John Zhuge created HADOOP-12990:
-----------------------------------

             Summary: lz4 incompatibility between OS and Hadoop
                 Key: HADOOP-12990
                 URL: https://issues.apache.org/jira/browse/HADOOP-12990
             Project: Hadoop Common
          Issue Type: Bug
          Components: io, native
    Affects Versions: 2.6.0
            Reporter: John Zhuge
            Priority: Minor


{{hdfs dfs -text}} hit exception when trying to view the compression file created by Linux
lz4 tool.

The Hadoop version has HADOOP-11184 "update lz4 to r123", thus it is using LZ4 library in
release r123.

Linux lz4 version:
{code}
$ /tmp/lz4 -h 2>&1 | head -1
*** LZ4 Compression CLI 64-bits r123, by Yann Collet (Apr  1 2016) ***
{code}

Test steps:
{code}
$ cat 10rows.txt
001|c1|c2|c3|c4|c5|c6|c7|c8|c9
002|c1|c2|c3|c4|c5|c6|c7|c8|c9
003|c1|c2|c3|c4|c5|c6|c7|c8|c9
004|c1|c2|c3|c4|c5|c6|c7|c8|c9
005|c1|c2|c3|c4|c5|c6|c7|c8|c9
006|c1|c2|c3|c4|c5|c6|c7|c8|c9
007|c1|c2|c3|c4|c5|c6|c7|c8|c9
008|c1|c2|c3|c4|c5|c6|c7|c8|c9
009|c1|c2|c3|c4|c5|c6|c7|c8|c9
010|c1|c2|c3|c4|c5|c6|c7|c8|c9
$ /tmp/lz4 10rows.txt 10rows.txt.r123.lz4
Compressed 310 bytes into 105 bytes ==> 33.87%
$ hdfs dfs -put 10rows.txt.r123.lz4 /tmp
$ hdfs dfs -text /tmp/10rows.txt.r123.lz4
16/04/01 08:19:07 INFO compress.CodecPool: Got brand-new decompressor [.lz4]
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at org.apache.hadoop.io.compress.BlockDecompressorStream.getCompressedData(BlockDecompressorStream.java:123)
    at org.apache.hadoop.io.compress.BlockDecompressorStream.decompress(BlockDecompressorStream.java:98)
    at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:85)
    at java.io.InputStream.read(InputStream.java:101)
    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:85)
    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:59)
    at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:119)
    at org.apache.hadoop.fs.shell.Display$Cat.printToStdout(Display.java:106)
    at org.apache.hadoop.fs.shell.Display$Cat.processPath(Display.java:101)
    at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:317)
    at org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:289)
    at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:271)
    at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:255)
    at org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:118)
    at org.apache.hadoop.fs.shell.Command.run(Command.java:165)
    at org.apache.hadoop.fs.FsShell.run(FsShell.java:315)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
    at org.apache.hadoop.fs.FsShell.main(FsShell.java:372)
{code}



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