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https://issues.apache.org/jira/browse/HBASE-4056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061672#comment-13061672
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stack commented on HBASE-4056:
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Nice idea Praveen. We should just do this now. You can have one config refer
to another so the wal fs can just refer to the root fs.
> Support for using faster storage for write-ahead log
> ----------------------------------------------------
>
> Key: HBASE-4056
> URL: https://issues.apache.org/jira/browse/HBASE-4056
> Project: HBase
> Issue Type: New Feature
> Reporter: Praveen Kumar
> Priority: Minor
> Labels: features
>
> On clusters with heterogeneous storage components like hard drives and flash
> memory, it could be beneficial to use flash memory for write-ahead log. This
> can be accomplished by using client side mount table support (HADOOP-7257)
> that is offered by HDFS federation (HDFS-1052) feature. One can define two
> HDFS namespaces (faster and slower), and configure HBase to use faster
> storage namespace for storing WAL.
> This is an abstract task that captures the idea. More brainstorming and
> subtasks identification to follow.
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