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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12934) Utilize Flash storage for flushing
Date Wed, 28 Jan 2015 00:28:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14294475#comment-14294475
] 

Devaraj Das commented on HBASE-12934:
-------------------------------------

bq. And as I stated, other parts are more obvious: finishing HBASE-5954 and then place WALs
on SSDs, or allow column families to be stored on SSDs for random read load.
[~lhofhansl], agree on the fact that HBASE-5954 should be done in order to see benefits that
HBASE-12848 potentially brings in. But could you please clarify on the "storing of column
families" - what Ted did here would be a starting point for that? I took a quick look at the
patch and it seems it handles the case of flushing but not compaction. Or, are you suggesting
that we could "promote" certain column families' files to SSDs when we see fit (manually /
automatically).. 

bq. Then again compactions are tricky, since the write-amplification will wear out the SSDs.
[~lhofhansl], did you have any material that talks about that. A quick search on the web on
this topic led me to some material but those were not conclusive. I was chatting with [~sureshms]
on this and we are both interested to hear more this... ([~sureshms] feel free to chime in).

> Utilize Flash storage for flushing
> ----------------------------------
>
>                 Key: HBASE-12934
>                 URL: https://issues.apache.org/jira/browse/HBASE-12934
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>         Attachments: 12934-001.txt
>
>
> Store flushing should be able to make use of hdfs storage policy.
> One option is to allow setting storage policy for the directory path of the specified
column family.



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