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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8522) Archived hfiles and old hlogs may be deleted immediatly by HFileCleaner, LogCleaner in HMaster
Date Fri, 10 May 2013 17:11:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13654612#comment-13654612

Lars Hofhansl commented on HBASE-8522:

Isn't the time when the writer closes the right time anyway?
Just because we move the logs into the .archive folder doesn't mean that they should be retained
any longer.

> Archived hfiles and old hlogs may be deleted immediatly by HFileCleaner, LogCleaner in
> ----------------------------------------------------------------------------------------------
>                 Key: HBASE-8522
>                 URL: https://issues.apache.org/jira/browse/HBASE-8522
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.3
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Minor
>         Attachments: HBASE-8522-trunk.patch
> TimeToLiveHFileCleaner is configed to 'hbase.master.hfilecleaner.plugins' in hbase-default.xml.
And timeToLiveHFileCleaner uses the modify time of the hfile to determine if it should be
deleted. But, the modify time of the hdfs file is time when its writer is closed. The rename
op will not change the modify time of the hfile. So the hfile may be deleted immediatly by
HFileCleaner after it is moved to archives. See log:
> 2013-05-08 08:15:46,053 DEBUG org.apache.hadoop.hbase.master.cleaner.CleanerChore: Checking
directory: hdfs://hbase/.archive/table/4e48ffc1ec089082c66e6d1b5f018fb5/M/729e8bc1430540cb9b2c147c90039cdc
> 2013-05-08 08:15:46,055 DEBUG org.apache.hadoop.ipc.ProtobufRpcEngine: Call: getFileInfo
took 1ms
> 2013-05-08 08:15:46,055 DEBUG org.apache.hadoop.hbase.master.cleaner.TimeToLiveHFileCleaner:
Life:40033567, ttl:300000, current:1367972146054, from: 1367932112487
> 2013-05-08 08:15:46,055 DEBUG org.apache.hadoop.hbase.master.cleaner.CleanerChore: Removing:hdfs://hbase/.archive/table/4e48ffc1ec089082c66e6d1b5f018fb5/M/729e8bc1430540cb9b2c147c90039cdc
from archive
> The same to old hlogs.
> And my solution is very simple: When hfiles and hlogs are archived, we set the modify
time of files after rename.

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