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https://issues.apache.org/jira/browse/HBASE-6841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459893#comment-13459893
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Andrew Purtell commented on HBASE-6841:
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Given J-D's observations, perhaps we should default meta prefetch to off, like
Stack suggests.
Some time ago I patched our private Frankenbase to allow disable of meta
prefetch on a per table basis. This was because meta prefetch was causing heap
limited MR clients to OOME, and for that particular application table prefetch
wasn't helpful.
> Meta prefetching is slower than doing multiple meta lookups
> -----------------------------------------------------------
>
> Key: HBASE-6841
> URL: https://issues.apache.org/jira/browse/HBASE-6841
> Project: HBase
> Issue Type: Improvement
> Reporter: Jean-Daniel Cryans
> Priority: Critical
> Fix For: 0.94.2
>
>
> I got myself into a situation where I needed to truncate a massive table
> while it was getting hits and surprisingly the clients were not recovering.
> What I see in the logs is that every time we prefetch .META. we setup a new
> HConnection because we close it on the way out. It's awfully slow.
> We should just turn it off or make it useful. jstacks coming up.
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