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From "Jean-Daniel Cryans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5333) Introduce Memstore "backpressure" for writes
Date Tue, 07 Feb 2012 00:35:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201880#comment-13201880
] 

Jean-Daniel Cryans commented on HBASE-5333:
-------------------------------------------

I've done some brainstorming with Stack and the result was HBASE-5162.
                
> Introduce Memstore "backpressure" for writes
> --------------------------------------------
>
>                 Key: HBASE-5333
>                 URL: https://issues.apache.org/jira/browse/HBASE-5333
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>
> Currently if the memstore/flush/compaction cannot keep up with the writeload, we block
writers up to hbase.hstore.blockingWaitTime milliseconds (default is 90000).
> Would be nice if there was a concept of a soft "backpressure" that slows writing clients
gracefully *before* we reach this condition.
> From the log:
> "2012-02-04 00:00:06,963 WARN org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Region
<table>,,1328313512779.c2761757621ddf8fb78baf5288d71271. has too many store files; delaying
flush up to 90000ms"

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