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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 Thu, 26 Jan 2017 22:11:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15840545#comment-15840545

stack commented on HBASE-17437:

I took a look at the patch and left some comments. I think this patch is fine and won't disrupt
the fs redo project (I think you can see how if the fs redo had been done already, you'd have
a much easier time of adding in this feature). 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: Improvement
>          Components: Filesystem Integration, wal
>    Affects Versions: 1.2.4
>            Reporter: Yishan Yang
>            Assignee: Zach York
>              Labels: patch
>             Fix For: 2.0.0, 1.4.0
>         Attachments: hbase-17437-branch-1.2.patch, HBASE-17437.master.001.patch, HBASE-17437.master.002.patch,
HBASE-17437.master.003.patch, HBASE-17437.master.004.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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