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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12848) Utilize Flash storage for WAL
Date Wed, 14 Jan 2015 22:50:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14277831#comment-14277831
] 

Sean Busbey commented on HBASE-12848:
-------------------------------------

That's not my concern; It's that we have "WAL_STORAGE_POLICY_ONE_SSD" and "WAL_STORAGE_POLICY_ALL_SSD"
and do no verification that folks have used one of those or the default. Could we remove them
in the code and end the release note with a link to [the HDFS docs on storage policy|http://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html]?
We could do it as a part of pointing out that the underlying HDFS instance must be configured
to use storage policies.

> Utilize Flash storage for WAL
> -----------------------------
>
>                 Key: HBASE-12848
>                 URL: https://issues.apache.org/jira/browse/HBASE-12848
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: 12848-v1.patch, 12848-v2.patch, 12848-v3.patch
>
>
> One way to improve data ingestion rate is to make use of Flash storage.
> HDFS is doing the heavy lifting - see HDFS-7228.
> We assume an environment where:
> 1. Some servers have a mix of flash, e.g. 2 flash drives and 4 traditional drives.
> 2. Some servers have all traditional storage.
> 3. RegionServers are deployed on both profiles within one HBase cluster.
> This JIRA allows WAL to be managed on flash in a mixed-profile environment.



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