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https://issues.apache.org/jira/browse/HADOOP-5244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy resolved HADOOP-5244.
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Resolution: Duplicate
Duplicate of HADOOP-4780.
> Distributed cache spends a lot of time runing du -s
> ---------------------------------------------------
>
> 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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