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From "Yishan Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-17437) Support specifying WAL directory to different directory with different file system (For example: S3)
Date Fri, 06 Jan 2017 23:52:58 GMT

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

Yishan Yang updated HBASE-17437:
--------------------------------
    Description: 
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.

  was: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).


> Support specifying WAL directory to different directory with different file system (For
example: S3)
> ----------------------------------------------------------------------------------------------------
>
>                 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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