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From "Zach York (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17437) Support specifying a WAL directory outside of the root directory
Date Wed, 01 Feb 2017 23:55:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849139#comment-15849139

Zach York commented on HBASE-17437:

[~uagashe] Yes, I am doing that right now, but it is a large patch. I should have something
up by the end of the day, but it should be reviewed again to make sure nothing was missed.

> 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.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-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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