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Posted to issues@hbase.apache.org by "Jean-Daniel Cryans (JIRA)" <ji...@apache.org> on 2012/10/25 17:55:12 UTC
[jira] [Commented] (HBASE-6841) Meta prefetching is slower than
doing multiple meta lookups
[ https://issues.apache.org/jira/browse/HBASE-6841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13484210#comment-13484210 ]
Jean-Daniel Cryans commented on HBASE-6841:
-------------------------------------------
I'm not seeing it again because I disabled prefetching in our production clusters.
> 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
> Assignee: Lars Hofhansl
> Fix For: 0.94.4
>
> Attachments: 6841-0.94.txt, 6841-0.96.txt
>
>
> 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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