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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3193) bulkImport file rename is a bottleneck
Date Thu, 02 Oct 2014 19:39:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14157041#comment-14157041
] 

Keith Turner commented on ACCUMULO-3193:
----------------------------------------

If we are not globbing, I wonder if that would help.

> bulkImport file rename is a bottleneck
> --------------------------------------
>
>                 Key: ACCUMULO-3193
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3193
>             Project: Accumulo
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1
>         Environment: very large cluster
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>             Fix For: 1.5.3, 1.6.2, 1.7.0
>
>
> On a very large cluster, importing a few thousand files takes several minutes.  Most
of that time is spent renaming the user's files into the accumulo bulk-load directory.  In
this case, the master is competing against the other demands on the NN.  The master could
adopt the same strategy as the file GC, and run the renames in parallel, to push more operations
into the NN at one time.



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