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From "Ben Maurer (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5244) Distributed cache spends a lot of time runing du -s
Date Fri, 13 Feb 2009 02:37:59 GMT
Distributed cache spends a lot of time runing du -s
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                 Key: HADOOP-5244
                 URL: https://issues.apache.org/jira/browse/HADOOP-5244
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
            Reporter: Ben Maurer


When running a MapReduce job that has a large jar on the class path (eg, jruby from hbase),
the task tracker takes a large amount of CPU time during startup. Using jstack, I got the
following stack trace:

"Thread-8941" daemon prio=10 tid=0x00002aab08005c00 nid=0x2807 waiting on condition [0x0000000043eca000..0x0000000043ecbc90]
   java.lang.Thread.State: RUNNABLE
	at java.lang.StringCoding$StringEncoder.encode(StringCoding.java:232)
	at java.lang.StringCoding.encode(StringCoding.java:272)
	at java.lang.String.getBytes(String.java:947)
	at java.io.UnixFileSystem.getLength(Native Method)
	at java.io.File.length(File.java:848)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:428)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.fs.FileUtil.getDU(FileUtil.java:433)
	at org.apache.hadoop.filecache.DistributedCache.getLocalCache(DistributedCache.java:210)
	at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:178)

Running the system "du" returns very quickly on the directory. 


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