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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17437) Support specifying a WAL directory outside of the root directory
Date Sat, 07 Jan 2017 03:24:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15806632#comment-15806632

Ted Yu commented on HBASE-17437:

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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