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https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16510637#comment-16510637
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Andrew Purtell commented on HBASE-17437:
----------------------------------------

I tested this feature via the backport to 1.x. It worked, or my tests running 1 
with root on FS would have failed. They didn’t.  I mean, not in the WAL code, 
anyway. 

> 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: Zach York
>            Priority: Major
>              Labels: patch
>             Fix For: 1.4.0, 2.0.0
>
>         Attachments: HBASE-17437.branch-1.001.patch, 
> HBASE-17437.branch-1.002.patch, HBASE-17437.branch-1.003.patch, 
> HBASE-17437.branch-1.004.patch, HBASE-17437.master.001.patch, 
> HBASE-17437.master.002.patch, HBASE-17437.master.003.patch, 
> HBASE-17437.master.004.patch, HBASE-17437.master.005.patch, 
> HBASE-17437.master.006.patch, HBASE-17437.master.007.patch, 
> HBASE-17437.master.008.patch, HBASE-17437.master.009.patch, 
> HBASE-17437.master.010.patch, HBASE-17437.master.011.patch, 
> HBASE-17437.master.012.patch, 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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