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From Sudhir Vallamkondu <Sudhir.Vallamko...@icrossing.com>
Subject Re: error:Caused by: java.lang.ClassNotFoundException: com.hadoop.compression.lzo.LzopCodec
Date Wed, 04 Aug 2010 23:54:03 GMT
Couple of things you can try.

Did you restart the task trackers after installing the lzo libs? You can
check if the lzo lib is in the classpath or not by doing

ps auxw | grep tasktracker | grep lzo | wc –l

The above returns 1 if classpath contains the lzo lib

There is a local LZO indexer that you can run on each tasktracker to check
it works right or not

hadoop jar $HADOOP_HOME/lib/hadoop-lzo-0.4.4.jar
com.hadoop.compression.lzo.LzoIndexer test.lzo


On Wed, Jul 28, 2010 at 7:42 AM, Alex Luya <alexander.luya@gmail.com> wrote:

> Hello:
>    I got source code from http://github.com/kevinweil/hadoop-lzo,compiled
> them successfully,and then
> 1,copy hadoop-lzo-0.4.4.jar to directory:$HADOOP_HOME/lib of each master
> and
> slave
> 2,Copy all files under directory:../Linux-amd64-64/lib to directory:
> $HADDOOP_HOME/lib/native/Linux-amd64-64 of each master and slave
> 3,and upload a file:test.lzo to HDFS
> 4,then run:hadoop jar $HADOOP_HOME/lib/hadoop-lzo-0.4.4.jar
> com.hadoop.compression.lzo.DistributedLzoIndexer test.lzo to test
>
> got errors:
>
> 
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
-------------
> 10/07/20 22:37:37 INFO lzo.GPLNativeCodeLoader: Loaded native gpl library
> 10/07/20 22:37:37 INFO lzo.LzoCodec: Successfully loaded & initialized
> native-
> lzo library [hadoop-lzo rev 5c25e0073d3dae9ace4bd9eba72e4dc43650c646]
> ##########^_^^_^^_^^_^^_^^_^##################
> (I think this says all native library got loaded successfully)
> ################################
> 10/07/20 22:37:37 INFO lzo.DistributedLzoIndexer: Adding LZO file
> target.lz:o
> to indexing list (no index currently exists)
> ...
> attempt_201007202234_0001_m_000000_0, Status : FAILED
> java.lang.IllegalArgumentException: Compression codec
> com.hadoop.compression.lzo.LzopCodec
>                 not found.
>        at
>
> 
org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(Compressio
nCodecFactory.java:96)
>        at
>
> 
org.apache.hadoop.io.compress.CompressionCodecFactory.<init>(CompressionCodecFac
tory.java:134)
>        at
>
> 
com.hadoop.mapreduce.LzoSplitRecordReader.initialize(LzoSplitRecordReader.java:4
8)
>        at
>
> 
org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java
:418)
>        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:620)
>        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
>        at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Caused by: java.lang.ClassNotFoundException:
> com.hadoop.compression.lzo.LzopCodec
>
>        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>        at java.security.AccessController.doPrivileged(Native Method)
>        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>        at java.lang.Class.forName0(Native Method)
>        at java.lang.Class.forName(Class.java:247)
>        at
> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:762)
>        at
>
> 
org.apache.hadoop.io.compress.CompressionCodecFactory.getCodecClasses(Compressio
nCodecFactory.java:89)
>        ... 6 more
>
> 
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--------------
>
>
> There is a installation instruction in this
> link:http://github.com/kevinweil/hadoop-lzo,it says other configurings are
> needed :
>
> Once the libs are built and installed, you may want to add them to the
> class
> paths and library paths. That is, in hadoop-env.sh, set
>
>   (1)export HADOOP_CLASSPATH=/path/to/your/hadoop-lzo-lib.jar
>
> Question:I have copied hadoop-lzo-0.4.4.jar to $HADOOP_HOME/lib,
> ,should I do set this entry like this again? actually, after I add this:
> export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$HBASE_HOME/hbase-0.20.4.jar:
> $HABSE_HOME/config:$ZOOKEEPER_HOME/zookeeper-3.3.1.jar:$HADOOP_HOME/lib
> /hadoop-lzo-0.4.4.jar,redo 1-4 as above,same problem as before,so:
>  how can I
> get hadoop to load hadoop-lzo-0.4.4.jar?)
>
>
>    (2),export JAVA_LIBRARY_PATH=/path/to/hadoop-lzo-native-
> libs:/path/to/standard-hadoop-native-libs
>    Note that there seems to be a bug in /path/to/hadoop/bin/hadoop; comment
> out the line
>    (3)JAVA_LIBRARY_PATH=''
>
>
> Question:since native library got loaded successfully,aren't these
> operation(2)(3) needed?
>
>
> -----------------------------------------------
> I am using hadoop 0.20.2
> core-site.xml
>
> -----------------------------------------------------------------------------
> <configuration>
>        <property>
>                <name>fs.default.name</name>
>                <value>hdfs://hadoop:8020</value>
>        </property>
>        <property>
>                <name>hadoop.tmp.dir</name>
>                <value>/home/hadoop/tmp</value>
>        </property>
>
>        <property>
>                <name>io.compression.codecs</name>
>
>
> 
<value>org.apache.hadoop.io.compress.GzipCodec,org.apache.hadoop.io.compress.Def
aultCodec,org.apache.hadoop.io.compress.BZip2Codec,com.hadoop.compression.lzo.Lz
oCodec,com.hadoop.compression.lzo.LzopCodec
>                </value>
>        </property>
>        <property>
>                <name>io.compression.codec.lzo.class</name>
>                <value>com.hadoop.compression.lzo.LzoCodec</value>
>        </property>
> </configuration>
>
>
> -----------------------------------------------------------------------------
> mapred-site.xml
>
> -----------------------------------------------------------------------------
> <configuration>
>        <property>
>                <name>mapred.job.tracker</name>
>                <value>AlexLuya:9001</value>
>        </property>
>        <property>
>                <name>mapred.tasktracker.reduce.tasks.maximum</name>
>                <value>1</value>
>        </property>
>        <property>
>                <name>mapred.tasktracker.map.tasks.maximum</name>
>                <value>1</value>
>        </property>
>        <property>
>                <name>mapred.local.dir</name>
>                <value>/home/alex/hadoop/mapred/local</value>
>        </property>
>        <property>
>                <name>mapred.system.dir</name>
>                <value>/tmp/hadoop/mapred/system</value>
>        </property>
>        <property>
>                <name>mapreduce.map.output.compress</name>
>                <value>true</value>
>        </property>
>        <property>
>                <name>mapreduce.map.output.compress.codec</name>
>                <value>com.hadoop.compression.lzo.LzoCodec</value>
>        </property>
> </configuration>
>
>
> -----------------------------------------------------------------------------
> hadoop-env.sh
>
> -----------------------------------------------------------------------------
> # Set Hadoop-specific environment variables here.
>
> # The only required environment variable is JAVA_HOME.  All others are
> # optional.  When running a distributed configuration it is best to
> # set JAVA_HOME in this file, so that it is correctly defined on
> # remote nodes.
>
> # The java implementation to use.  Required.
> export JAVA_HOME=/usr/local/hadoop/jdk1.6.0_20
>
> # Extra Java CLASSPATH elements.  Optional.
> # export HADOOP_CLASSPATH=
>
> # The maximum amount of heap to use, in MB. Default is 1000.
> export HADOOP_HEAPSIZE=200
>
> # Extra Java runtime options.  Empty by default.
> #export HADOOP_OPTS=-server
>
> export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$HBASE_HOME/hbase-0.20.4.jar:
>
> 
$HABSE_HOME/config:$ZOOKEEPER_HOME/zookeeper-3.3.1.jar:$HADOOP_HOME/lib/hadoop-
> lzo-0.4.4.jar
> #export JAVA_LIBRARY_PATH=$HADOOP_HOME/lib/native/Linux-amd64-64
>
> # Command specific options appended to HADOOP_OPTS when specified
> export HADOOP_NAMENODE_OPTS="-Dcom.sun.management.jmxremote
> $HADOOP_NAMENODE_OPTS"
> export HADOOP_SECONDARYNAMENODE_OPTS="-Dcom.sun.management.jmxremote
> $HADOOP_SECONDARYNAMENODE_OPTS"
> export HADOOP_DATANODE_OPTS="-Dcom.sun.management.jmxremote
> $HADOOP_DATANODE_OPTS"
> export HADOOP_BALANCER_OPTS="-Dcom.sun.management.jmxremote
> $HADOOP_BALANCER_OPTS"
> export HADOOP_JOBTRACKER_OPTS="-Dcom.sun.management.jmxremote
> $HADOOP_JOBTRACKER_OPTS"
> # export HADOOP_TASKTRACKER_OPTS=
> # The following applies to multiple commands (fs, dfs, fsck, distcp etc)
> # export HADOOP_CLIENT_OPTS
>
> # Extra ssh options.  Empty by default.
> # export HADOOP_SSH_OPTS="-o ConnectTimeout=1 -o SendEnv=HADOOP_CONF_DIR"
>
> # Where log files are stored.  $HADOOP_HOME/logs by default.
> # export HADOOP_LOG_DIR=${HADOOP_HOME}/logs
>
> # File naming remote slave hosts.  $HADOOP_HOME/conf/slaves by default.
> # export HADOOP_SLAVES=${HADOOP_HOME}/conf/slaves
>
> # host:path where hadoop code should be rsync'd from.  Unset by default.
> # export HADOOP_MASTER=master:/home/$USER/src/hadoop
>
> # Seconds to sleep between slave commands.  Unset by default.  This
> # can be useful in large clusters, where, e.g., slave rsyncs can
> # otherwise arrive faster than the master can service them.
> # export HADOOP_SLAVE_SLEEP=0.1
>
> # The directory where pid files are stored. /tmp by default.
> # export HADOOP_PID_DIR=/var/hadoop/pids
>
> # A string representing this instance of hadoop. $USER by default.
> #export HADOOP_IDENT_STRING=$USER
>
> # The scheduling priority for daemon processes.  See 'man nice'.
> # export HADOOP_NICENESS=10
>


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