[ https://issues.apache.org/jira/browse/HADOOP-11785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391205#comment-14391205 ]
Zoran Dimitrijevic commented on HADOOP-11785: --------------------------------------------- I did not change any tests since this is a performance-bug fix and all existing tests pass. Should I mark this as a bug fix instead of improvement? > Reduce number of listStatus operation in distcp buildListing() > -------------------------------------------------------------- > > Key: HADOOP-11785 > URL: https://issues.apache.org/jira/browse/HADOOP-11785 > Project: Hadoop Common > Issue Type: Improvement > Components: tools/distcp > Affects Versions: 3.0.0 > Reporter: Zoran Dimitrijevic > Assignee: Zoran Dimitrijevic > Priority: Minor > Attachments: distcp-liststatus.patch > > Original Estimate: 1h > Remaining Estimate: 1h > > Distcp was taking long time in copyListing.buildListing() for large source > trees (I was using source of 1.5M files in a tree of about 50K directories). > For input at s3 buildListing was taking more than one hour. I've noticed a > performance bug in the current code which does listStatus twice for each > directory which doubles number of RPCs in some cases (if most directories do > not contain >1000 files). > -- This message was sent by Atlassian JIRA (v6.3.4#6332)