[jira] [Updated] (HBASE-17437) Support specifying a WAL directory outside of the root directory

["Yishan Yang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yishan Yang updated HBASE-17437:
--------------------------------
    Summary: Support specifying a WAL directory outside of the root directory  (was: Support specifying WAL directory to different directory with different file system (For example: S3))

> 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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