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https://issues.apache.org/jira/browse/HBASE-12848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Busbey updated HBASE-12848:
--------------------------------
Release Note:
For users on a version of Hadoop that supports tiered storage policies (i.e.
Apache Hadoop 2.6.0+), HBase now allows users to opt-in to having the write
ahead log placed on the SSD tier. Users on earlier versions of Hadoop will be
unable to take advantage of this feature.
Use of tiered storage is controlled by a new RegionServer config,
hbase.wal.storage.policy. It defaults to the value 'NONE', which will rely on
HDFS defaults for a policy decision.
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
See [the HDFS docs on storage
policy|http://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html]
> 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,
> 12848-v4.patch, 12848-v4.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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