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From "shangan" <shan...@corp.kaixin001.com>
Subject mapreduce doesn't work in my cluster
Date Wed, 18 Aug 2010 07:01:46 GMT
my cluster consists of 4 nodes : 1 namenode and 3 datanodes, it works well functioning as hdfs,but
when I run mapreduce tasks, it will take quite a long time and there're quite a lot of too
many fetch-failures. I've checked the log on the datanode and copy part of them as follows:



2010-08-18 14:28:33,142 WARN org.apache.hadoop.mapred.TaskTracker: Unknown child with bad
map output: attempt_201008171837_0007_m_000006_1. Ignored.
2010-08-18 14:28:33,143 INFO org.apache.hadoop.mapred.TaskTracker.clienttrace: src: 127.0.0.1:50060,
dest: 127.0.0.1:54245, bytes: 0, op: MAPRED_SHUFFLE, cliID: attempt_201008171837_0007_m_000006_1
2010-08-18 14:28:33,143 WARN org.mortbay.log: /mapOutput: org.apache.hadoop.util.DiskChecker$DiskErrorException:
Could not find taskTracker/jobcache/job_201008171837_0007/attempt_201008171837_0007_m_000006_1/output/file.out.index
in any of the configured local directories
2010-08-18 14:28:34,766 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000000_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:37,675 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000003_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:40,775 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000000_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:43,683 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000003_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:43,779 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000000_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:46,687 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000003_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:49,787 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000000_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:52,696 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000003_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:55,796 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000000_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:58,704 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000003_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:28:58,800 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000000_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:29:01,710 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000003_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:29:04,808 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201008171837_0007_r_000000_1
0.31666666% reduce > copy (19 of 20 at 0.00 MB/s) > 
2010-08-18 14:29:05,225 WARN org.apache.hadoop.mapred.TaskTracker: getMapOutput(attempt_201008171837_0007_m_000006_1,0)
failed :
org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find taskTracker/jobcache/job_201008171837_0007/attempt_201008171837_0007_m_000006_1/output/file.out.index
in any of the configured local directories
        at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathToRead(LocalDirAllocator.java:389)
        at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathToRead(LocalDirAllocator.java:138)
        at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:2887)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
2010-08-18 14:29:05,225 WARN org.apache.hadoop.mapred.TaskTracker: Unknown child with bad
map output: attempt_201008171837_0007_m_000006_1. Ignored.
2010-08-18 14:29:05,259 INFO org.apache.hadoop.mapred.TaskTracker.clienttrace: src: 127.0.0.1:50060,
dest: 127.0.0.1:54288, bytes: 0, op: MAPRED_SHUFFLE, cliID: attempt_201008171837_0007_m_000006_1
2010-08-18 14:29:05,259 WARN org.mortbay.log: /mapOutput: org.apache.hadoop.util.DiskChecker$DiskErrorException:
Could not find taskTracker/jobcache/job_201008171837_0007/attempt_201008171837_0007_m_000006_1/output/file.out.index
in any of the configured local directories



Almost all datanode behave the same way, seems reduce can't get the map result from other
datanode and I also looked at the charts from job Administrator, the copy process did last
quite a long time. Can anybody give me some explanation,and the following of my configuration
of hadoop-0.20.2:

core-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
   <property>
        <name>fs.default.name</name>
        <value>hdfs://vm153:9000</value>
   </property>
   <property>
        <name>fs.trash.interval</name>
        <value>20</value>
   </property>
<property>
  <name>fs.checkpoint.period</name>
  <value>300</value>
  <description>The number of seconds between two periodic checkpoints.
  </description>
</property>
</configuration>

hdfs-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
   <property>
        <name>fs.default.name</name>
        <value>hdfs://vm153:9000</value>
   </property>
   <property>
        <name>fs.trash.interval</name>
        <value>20</value>
   </property>
<property>
  <name>fs.checkpoint.period</name>
  <value>300</value>
  <description>The number of seconds between two periodic checkpoints.
  </description>
</property>
</configuration>
[shangan@vm153 conf]$ more hdfs-site.xml 
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
  <name>dfs.replication</name>
  <value>2</value>
</property>
<property>
  <name>dfs.hosts.exclude</name>
  <value>/home/shangan/bin/hadoop-0.20.2/conf/exclude</value>
</property>
</configuration>

mapred-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
   <property>
        <name>mapred.job.tracker</name>
        <value>vm153:9001</value>
   </property>
   <property>
        <name>mapred.map.tasks</name>
        <value>20</value>
   </property>
   <property>
        <name>mapred.reduce.tasks</name>
        <value>5</value>
   </property>
</configuration>

WHAT'S THE PROBLEM ?Do I need to configure other parameters, there're parameters like dfs.secondary.http.address,dfs.datanode.address,
the ip of which is 0.0.0.0,do I need to change them ?

2010-08-18 



shangan 

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