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https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15806632#comment-15806632
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Ted Yu commented on HBASE-17437:
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Why is the branch-1.2 patch significantly larger than master patch ?
Have you considered the impact of this change on replication ?
Please put master patch on review board.
> 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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