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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9208) ReplicationLogCleaner slow at large scale
Date Wed, 28 Aug 2013 18:42:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752705#comment-13752705
] 

Jean-Daniel Cryans commented on HBASE-9208:
-------------------------------------------

+1, I'll also give it a spin on 0.95 today.
                
> ReplicationLogCleaner slow at large scale
> -----------------------------------------
>
>                 Key: HBASE-9208
>                 URL: https://issues.apache.org/jira/browse/HBASE-9208
>             Project: HBase
>          Issue Type: Improvement
>          Components: Replication
>            Reporter: Dave Latham
>            Assignee: Dave Latham
>             Fix For: 0.94.12, 0.96.0
>
>         Attachments: HBASE-9208-0.94.patch, HBASE-9208-0.94-v2.patch, HBASE-9208.patch,
HBASE-9208-v2.patch, HBASE-9208-v3.patch
>
>
> At a large scale the ReplicationLogCleaner fails to clean up .oldlogs as fast as the
cluster is producing them.  For each old HLog file that has been replicated and should be
deleted the ReplicationLogCleaner checks every replication queue in ZooKeeper before removing
it.  This means that as a cluster scales up the number of files to delete scales as well as
the time to delete each file so the cleanup chore scales quadratically.  In our case it reached
the point where the oldlogs were growing faster than they were being cleaned up.
> We're now running with a patch that allows the ReplicationLogCleaner to refresh its list
of files in the replication queues from ZooKeeper just once for each batch of files the CleanerChore
wants to evaluate.
> I'd propose updating FileCleanerDelegate to take a List<FileStatus> rather than
a single one at a time.  This would allow file cleaners that check an external resource for
references such as ZooKeeper (for ReplicationLogCleaner) or HDFS (for SnapshotLogCleaner which
looks like it may also have similar trouble at scale) to load those references once per batch
rather than for every log.

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