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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17437) Support specifying a WAL directory outside of the root directory
Date Sat, 07 Jan 2017 05:49:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15806867#comment-15806867
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stack commented on HBASE-17437:
-------------------------------

[~yangyishan0901m] Thank you for your submission.

WAL dir gets same pegging as the root dir. Interesting. Could be helpful in cases other than
S3+EBS/EFS. We are working on redo of the fs layout but I'd think we could take this change
in the meantime.

How amenable are you to feedback on the patch? Is it deployed by you lot already? If so, I'd
imagine big changes would be tough?

Here is some quick feedback. More detail to follow.

Patch looks good. 

You use 'hlog' when you talk of the WAL dir and attributes. Would be better if you s/hlog/wal/g
and s/LOG/WAL/g. e.g. s/getLogRootDir/getWALDir/g This is a nit.

Thanks.







> Support specifying a WAL directory outside of the root directory
> ----------------------------------------------------------------
>
>                 Key: HBASE-17437
>                 URL: https://issues.apache.org/jira/browse/HBASE-17437
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.2.4
>            Reporter: Yishan Yang
>              Labels: patch
>             Fix For: 2.0.0, 1.2.5
>
>         Attachments: hbase-17437-branch-1.2.patch, hbase-17437-master.patch
>
>
> Currently, the WAL and the StoreFiles need to be on the same FileSystem. Some FileSystems
(such as Amazon S3) don’t support append or consistent writes. These two properties are
imperative for the WAL in order to avoid loss of writes. However, StoreFiles don’t necessarily
need the same consistency guarantees (since writes are cached locally and if writes fail,
they can always be replayed from the WAL).
>  
> This JIRA aims to allow users to configure a log directory (for WALs) that is outside
of the root directory or even in a different FileSystem. The default value will still put
the log directory under the root directory.



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