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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 Fri, 03 Feb 2017 05:26:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851087#comment-15851087
] 

stack commented on HBASE-17437:
-------------------------------

bq. What is the impact of configuring hbase.wal.dir to be on different FileSystem than the
root directory in the context of rolling restart ?

I think you know what would happen [~ted_yu].  Your point? That we need a release note saying
you need a clean shutdown the point at other than defaults?

> 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-1.001.patch, 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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