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https://issues.apache.org/jira/browse/HBASE-2477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kannan Muthukkaruppan resolved HBASE-2477.
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Resolution: Not A Problem
> Slowly changing column family or table could cause accumulation of logs &
> substantially increase recovery times
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-2477
> URL: https://issues.apache.org/jira/browse/HBASE-2477
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: Kannan Muthukkaruppan
>
> Memstore flushes are triggered today if a memstore exceeds a certain size or
> there is memory pressure. However, there is no timer based flush for a
> memstore. This means a single column family or table getting a very slow rate
> of writes could hold up old HLogs from getting reclaimed for long periods of
> time-- which in turn increases recovery time for a failed region server since
> there are a lot more logs to process.
> META is an example of a table which is likely to get very few writes. But
> even if we special cased META somehow, it wouldn't be good enough, since an
> application could genuinely have a mix of slow and fast changing tables or
> column families.
> What about also triggering flushes on a timer (in addition to the current
> mechanism) to bound recovery times?
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