[jira] [Comment Edited] (HBASE-17437) Support specifying a WAL directory outside of the root directory

["Umesh Agashe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813071#comment-15813071 ] 

Umesh Agashe edited comment on HBASE-17437 at 1/9/17 10:43 PM:
---------------------------------------------------------------

+1. This will help in FS layout redo (HBASE-14439) work as well. Overall changes look good to me.


was (Author: uagashe):
+1. This will help in FS redo work as well. Overall changes look good to me.

> 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: Improvement
>          Components: Filesystem Integration, wal
>    Affects Versions: 1.2.4
>            Reporter: Yishan Yang
>            Assignee: Yishan Yang
>              Labels: patch
>             Fix For: 2.0.0, 1.4.0
>
>         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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