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Hadoop QA commented on MAPREDUCE-5907: -------------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12647921/MAPREDUCE-5907-2.patch against trunk revision . {color:green}+1 @author{color}. The patch does not contain any @author tags. {color:green}+1 tests included{color}. The patch appears to include 5 new or modified test files. {color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings. {color:green}+1 javadoc{color}. There were no new javadoc warning messages. {color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse. {color:red}-1 findbugs{color}. The patch appears to introduce 2 new Findbugs (version 1.3.9) warnings. {color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings. {color:green}+1 core tests{color}. The patch passed unit tests in hadoop-common-project/hadoop-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core. {color:green}+1 contrib tests{color}. The patch passed contrib unit tests. Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4639//testReport/ Findbugs warnings: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4639//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-common.html Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4639//console This message is automatically generated. > Improve getSplits() performance for fs implementations that can utilize > performance gains from recursive listing > ---------------------------------------------------------------------------------------------------------------- > > Key: MAPREDUCE-5907 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-5907 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: client > Affects Versions: 2.4.0 > Reporter: Sumit Kumar > Assignee: Sumit Kumar > Attachments: MAPREDUCE-5907-2.patch, MAPREDUCE-5907.patch > > > FileInputFormat (both mapreduce and mapred implementations) use recursive > listing while calculating splits. They however do this by doing listing level > by level. That means to discover files in /foo/bar means they do listing at > /foo/bar first to get the immediate children, then make the same call on all > immediate children for /foo/bar to discover their immediate children and so > on. This doesn't scale well for object store based fs implementations like s3 > and swift because every listStatus call ends up being a webservice call to > backend. In cases where large number of files are considered for input, this > makes getSplits() call slow. > This patch adds a new set of recursive list apis that gives opportunity to > the fs implementations to optimize. The behavior remains the same for other > implementations (that is a default implementation is provided for other fs so > they don't have to implement anything new). However for objectstore based fs > implementations it provides a simple change to include recursive flag as true > (as shown in the patch) to improve listing performance. -- This message was sent by Atlassian JIRA (v6.2#6252)