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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8109) HBase can manage blocks instead of (or inside) files in HDFS
Date Thu, 18 Jul 2013 00:34:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711855#comment-13711855
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Sergey Shelukhin commented on HBASE-8109:
-----------------------------------------

bq. that Accumulo stresses the NN or DNs with lots of files
Should this be read as "Accumulo uses lots of files and that doesn't stress NN/DNs", or "Accumulo
doesn't use a lot of files and therefore doesn't stress NN/DNs"? :)
                
> HBase can manage blocks instead of (or inside) files in HDFS
> ------------------------------------------------------------
>
>                 Key: HBASE-8109
>                 URL: https://issues.apache.org/jira/browse/HBASE-8109
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Sergey Shelukhin
>
> Prompted by previous non-Hadoop experience and some dev list discussions, and after talking
to some HDFS people about blocks.
> HBase could improve a lot by managing HDFS blocks instead of files, and reusing the blocks
among other things. Some areas that could improve are splits, compactions, management of large
blobs, locality enforcement.
> I was told that block APIs in Hadoop 2 are well-isolated, but not exposed yet. They can
easily be exposed, and as one of the first potential users we could get to help shape them.
Two areas that from my limited understanding is currently fuzzy are namespaces for blocks,
and ref-counting.
> We should come up with list of initial scenarios to figure out what we need from block
API (locality, detecting/enforcing block boundary/variable size blocks, reusing one block,
...).

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