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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 Sat, 14 Jan 2017 02:43:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822653#comment-15822653
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Zach York commented on HBASE-17437:
-----------------------------------

Sorry for the delay in getting a new patch up here. There were a lot of changes.

I have uploaded a new patch and a new review.

I wanted to keep this patch as small as possible so I will rename existing variable names
to comply with WALRootDir as a followup.

> 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.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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