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https://issues.apache.org/jira/browse/MAPREDUCE-2349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13941629#comment-13941629
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Hudson commented on MAPREDUCE-2349:
-----------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk #515 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk/515/])
MAPREDUCE-2349. Modified FileInputFormat to be able to issue file and block
location calls in parallel. Contributed by Siddharth Seth. (vinodkv:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1579515)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/FileInputFormat.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/LocatedFileStatusFetcher.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/FileInputFormat.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestFileInputFormat.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/lib/input/TestFileInputFormat.java
> speed up list[located]status calls from input formats
> -----------------------------------------------------
>
> Key: MAPREDUCE-2349
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2349
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task
> Reporter: Joydeep Sen Sarma
> Assignee: Siddharth Seth
> Fix For: 2.4.0
>
> Attachments: MAPREDUCE-2349.1.wip.txt, MAPREDUCE-2349.2.txt,
> MAPREDUCE-2349.3.txt, MAPREDUCE-2349.4.txt, MAPREDUCE-2349.5.txt
>
>
> when a job has many input paths - listStatus - or the improved
> listLocatedStatus - calls (invoked from the getSplits() method) can take a
> long time. Most of the time is spent waiting for the previous call to
> complete and then dispatching the next call.
> This can be greatly speeded up by dispatching multiple calls at once (via
> executors). If the same filesystem client is used - then the calls are much
> better pipelined (since calls are serialized) and don't impose extra burden
> on the namenode while at the same time greatly reducing the latency to the
> client. In a simple test on non-peak hours, this resulted in the getSplits()
> time reducing from about 3s to about 0.5s.
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