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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11752) Document blockcache prefetch option
Date Fri, 15 Aug 2014 18:07:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14098854#comment-14098854
] 

Andrew Purtell commented on HBASE-11752:
----------------------------------------

Thanks Misty.

bq. One thing I couldn't figure out from looking at your patch is how do you set the option
in the region or column to enable this?

Set the PREFETCH_BLOCKS_ON_OPEN option as "true" in the column family schema.

For example, when creating the table with the shell:
{code}
hbase> create 'MyTable', { NAME => 'myCF', PREFETCH_BLOCKS_ON_OPEN => 'true' }
{code}

Or, if creating schema dynamically:

{code}
// ...
HTableDescriptor tableDesc = new HTableDescriptor("myTable");
HColumnDescriptor cfDesc = new HColumnDescriptor("myCF");
cfDesc.setPrefetchBlocksOnOpen(true);
tableDesc.addFamily(cfDesc);
// ...
{code}


> Document blockcache prefetch option
> -----------------------------------
>
>                 Key: HBASE-11752
>                 URL: https://issues.apache.org/jira/browse/HBASE-11752
>             Project: HBase
>          Issue Type: Sub-task
>          Components: BlockCache, documentation
>            Reporter: Misty Stanley-Jones
>            Assignee: Misty Stanley-Jones
>             Fix For: 0.99.0, 0.98.3
>
>         Attachments: HBASE-11752.patch
>
>




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