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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4529) Make WAL Pluggable
Date Mon, 02 Jan 2012 17:36:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178472#comment-13178472
] 

Zhihong Yu commented on HBASE-4529:
-----------------------------------

@Dhruba:
Akash is working on HBASE-4224 at the moment.
Feel free to give this nice feature a try.
                
> Make WAL Pluggable 
> -------------------
>
>                 Key: HBASE-4529
>                 URL: https://issues.apache.org/jira/browse/HBASE-4529
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver, wal
>            Reporter: Akash Ashok
>              Labels: regionserver, wal
>
> Make WAL a pluggable, configurable component, thus making it easier to write to different
filesystems (including multiple filesystems).
> From Stack:
> Pluggable WAL component would need to check that the split can deal w/
> multiple logs written by the one server concurrently (sort by sequence
> edit id after sorting on all the rest that makes up a wal log key).
> From Jesse Yates:
> It would be nice to be able to tie pluggable WAL component into a service that logs directly
to
> disk, rather than go through HDFS giving some potentially awesome speedup at
> the cost of having to write a logging service that handles replication, etc.
> From Karthik Tunga:
> Along with the log replaying part, logic is also needed for log roll.
> This, I think, is easier compared to the merging of the logs. Any edits less
> than the last sequence number on the file system can be removed from all
> the WALs.

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