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MapReduce >> mail # user >> enable snappy on hadoop 1.1.1

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RE: enable snappy on hadoop 1.1.1
Thanks for your guys' help.
It looks like the libhadoop.so didn't link the snappy in it, even it claims to support it in 2.1. I already created a ticket for this.
I manually compiled the hadoop native library myself, and use that for now.

Subject: RE: enable snappy on hadoop 1.1.1
Date: Mon, 7 Oct 2013 04:16:47 +0000
Problem might be snappy packages may not bulit(While buliding the hadoop you need to include snappy)..


libhadoop.so should contain the snappy packages


Please check the following output to check whether snappy is included or not....


Verification : nm {HADOOP_HOME}/lib/native/Linux-amd64-64/libhadoop.so | grep snappy
From: bharath vissapragada [[EMAIL PROTECTED]]

Sent: Sunday, October 06, 2013 2:25 AM

To: User

Subject: Re: enable snappy on hadoop 1.1.1
whats the output of ldd on that lib? Does it link properly? You should compile natives for your platforms as the packaged ones may not link properly.
On Sat, Oct 5, 2013 at 2:37 AM, java8964 java8964

I kind of read the hadoop 1.1.1 source code for this, it is very strange for me now.

>From the error, it looks like runtime JVM cannot find the native method of org/apache/hadoop/io/compress/snappy/SnappyCompressor.compressBytesDirect()I, that my guess from the error message, but from the log, it looks like all the native library, include
 native-hadoop and native snappy are both loaded, as shown in the failed task log:
2013-10-04 16:33:21,635 INFO org.apache.hadoop.util.NativeCodeLoader: Loaded the native-hadoop library
2013-10-04 16:33:22,006 INFO org.apache.hadoop.util.ProcessTree: setsid exited with exit code 0
2013-10-04 16:33:22,020 INFO org.apache.hadoop.mapred.Task:  Using ResourceCalculatorPlugin : org.apache.hadoop.util.LinuxResourceCalculatorPlugin@28252825
2013-10-04 16:33:22,111 INFO org.apache.hadoop.mapred.MapTask: numReduceTasks: 1
2013-10-04 16:33:22,116 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb = 256
2013-10-04 16:33:22,168 INFO org.apache.hadoop.mapred.MapTask: data buffer = 204010960/255013696
2013-10-04 16:33:22,168 INFO org.apache.hadoop.mapred.MapTask: record buffer = 671088/838860
2013-10-04 16:33:22,342 WARN org.apache.hadoop.io.compress.snappy.LoadSnappy: Snappy native library is available
2013-10-04 16:33:22,342 INFO org.apache.hadoop.io.compress.snappy.LoadSnappy: Snappy native library loaded
2013-10-04 16:33:44,054 INFO org.apache.hadoop.mapred.MapTask: Starting flush of map output
2013-10-04 16:33:44,872 WARN org.apache.hadoop.io.compress.snappy.SnappyCompressor: java.lang.UnsatisfiedLinkError: org/apache/hadoop/io/compress/snappy/SnappyCompressor.initIDs()V
2013-10-04 16:33:44,872 INFO org.apache.hadoop.io.compress.CodecPool: Got brand-new compressor
2013-10-04 16:33:44,928 INFO org.apache.hadoop.mapred.TaskLogsTruncater: Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1
2013-10-04 16:33:44,951 INFO org.apache.hadoop.io.nativeio.NativeIO: Initialized cache for UID to User mapping with a cache timeout of 14400 seconds.
2013-10-04 16:33:44,951 INFO org.apache.hadoop.io.nativeio.NativeIO: Got UserName yzhang for UID 1000 from the native implementation
2013-10-04 16:33:44,952 FATAL org.apache.hadoop.mapred.Child: Error running child : java.lang.UnsatisfiedLinkError: org/apache/hadoop/io/compress/snappy/SnappyCompressor.compressBytesDirect()I

        at org.apache.hadoop.io.compress.snappy.SnappyCompressor.compress(SnappyCompressor.java:229)
        at org.apache.hadoop.io.compress.BlockCompressorStream.compress(BlockCompressorStream.java:141)
        at org.apache.hadoop.io.compress.BlockCompressorStream.finish(BlockCompressorStream.java:135)
        at org.apache.hadoop.mapred.IFile$Writer.close(IFile.java:135)
        at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:1450)

        at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1297)
        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
        at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
        at java.security.AccessController.doPrivileged(AccessController.java:310)
        at javax.security.auth.Subject.doAs(Subject.java:573)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
        at org.apache.hadoop.mapred.Child.main(Child.java:249)

So is there any way I can check if $HADOOP_HOME/lib/native/Linux-amd64-64/libhadoop.so contains the native method as expected above?
This hadoop 1.1.0 is not compiled by me, but coming from IBM biginsight 2.1 as we are evaluating it. I will create a ticket for them, but is this kind of strange, as everything loaded shown in the log, but complains later about a native method? Any reason
 can cause this?




Subject: enable snappy on hadoop 1.1.1

Date: Fri, 4 Oct 2013 15:44:34 -0400


I am using hadoop 1.1.1. I want to test to see the snappy compression with hadoop, but I have some problems to make it work on my Linux environment.

I am using opensuse 12.3 x86_64.

First, when I tried to enable snappy in hadoop 1.1.1 by:
            conf.setBoolean("mapred.compress.map.output", true);
            conf.set("mapred.output.compression.type", "RECORD");
            conf.set("mapred.map.output.compression.codec", "org.apache.hadoop.io.compress.SnappyCodec");
I got the following error in my test MR job:

Exception in thread "main" java.lang.RuntimeException: native snappy library not available

So I download the snappy 1.1.0 from https://code.google.com/p/snappy/, compile it and install it successfully under /opt/snappy-1.1.0, and then I link the /opt/snappy-1.1.0/lib64/libsnappy.so
 to /user/lib64/libsnappy.so

Now after I r
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB