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Date: Wed, 14 Jan 2015 22:53:35 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12767199.1421170693000.86242.1421276015331@Atlassian.JIRA>
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Subject: [jira] [Updated] (HBASE-12848) Utilize Flash storage for WAL
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     [ https://issues.apache.org/jira/browse/HBASE-12848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Yu updated HBASE-12848:
---------------------------
    Release Note: 
New config, hbase.wal.storage.policy, is added with default value 'NONE'
User can specify ONE_SSD or ALL_SSD as the value:
ONE_SSD: place only one replica of WAL files in SSD and the remaining in default storage
ALL_SSD: all replica for WAL files are placed on SSD

See [the HDFS docs on storage policy|http://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html]

  was:
New config, hbase.wal.storage.policy, is added with default value 'NONE'
User can specify ONE_SSD or ALL_SSD as the value:
ONE_SSD: place only one replica of WAL files in SSD and the remaining in default storage
ALL_SSD: all replica for WAL files are placed on SSD


> 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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