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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9019) Port HBASE-8690: Reduce unnecessary getFileStatus hdfs calls in TTL hfile and hlog cleanners to 0.94
Date Tue, 23 Jul 2013 03:52:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13716017#comment-13716017
] 

Lars Hofhansl commented on HBASE-9019:
--------------------------------------

Could you name the patches with .txt or .patch? Otherwise I have download the patch first
in order to open it.
                
> Port HBASE-8690: Reduce unnecessary getFileStatus hdfs calls in TTL hfile and hlog cleanners
to 0.94
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-9019
>                 URL: https://issues.apache.org/jira/browse/HBASE-9019
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>            Priority: Minor
>         Attachments: 9019.94
>
>
> 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 is to change the path param to FileStatus in isFileDeletable method and reduce unnecessary
getFileStatus hdfs calls in TTL cleaners.
> This issue is to backport this improvement to 0.94

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