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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2752) Don't retry forever when waiting on too many store files
Date Fri, 18 Jun 2010 23:41:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880369#action_12880369
] 

Jean-Daniel Cryans commented on HBASE-2752:
-------------------------------------------

This is something that Dave Latham was hitting when trying out 0.20.5 RC3. One of his region
server was compacting non-stop and a region could be blocked for minutes.

> Don't retry forever when waiting on too many store files
> --------------------------------------------------------
>
>                 Key: HBASE-2752
>                 URL: https://issues.apache.org/jira/browse/HBASE-2752
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jean-Daniel Cryans
>            Assignee: stack
>            Priority: Critical
>             Fix For: 0.20.5, 0.21.0
>
>
> HBASE-2087 introduced a way to not block all flushes when on region has too many store
files. Unfortunately, that undid the behavior that if we waited for longer than 90 secs then
that we would still flush the region... which means that when a  region blocks inserts because
its memstore is too big it's actually holding off writes for a very long time, occupying handlers,
etc.
> We need to add more smarts in MemStoreFlusher so that we detect when a region was held
up for too long.

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