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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8690) Reduce unnecessary getFileStatus hdfs calls in TTL hfile and hlog cleanners
Date Mon, 22 Jul 2013 21:50:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13715735#comment-13715735
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Lars Hofhansl commented on HBASE-8690:
--------------------------------------

Seems both 0.94 and 0.95 would benefit from this.
                
> Reduce unnecessary getFileStatus hdfs calls in TTL hfile and hlog cleanners
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-8690
>                 URL: https://issues.apache.org/jira/browse/HBASE-8690
>             Project: HBase
>          Issue Type: Improvement
>          Components: master
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Minor
>             Fix For: 0.98.0
>
>         Attachments: 8690-trunk-v3.patch, 8690-trunk-v4.patch, HBASE-8690-0.94-v1.patch,
HBASE-8690-trunk-v1.patch, HBASE-8690-trunk-v2.patch
>
>
> For each in file in archive dir, the TimeToLiveHFileCleaner need call getFileStatus to
get the modify time of file. Actually the CleanerChore have had the file status when listing
its parent dir. 
> When we set the TTL to 7 days in our cluster for data security, the number of files left
in archive dir is up to 65 thousands. In each clean period, TimeToLiveHFileCleaner will generate
ten thousand getFileStatus call in a short time, which is very heavy for hdfs namenode.
> Fix: Change the path param to FileStatus in isFileDeletable method and reduce unnecessary
getFileStatus hdfs calls in TTL cleaners.

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