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From stack <st...@duboce.net>
Subject Re: Optional memstore flush
Date Wed, 23 Sep 2009 22:00:46 GMT
Looks like it was removed before the release of 0.19.0 by hbase-728 (Do svn
diff -r705770:707247 conf/hbase-default.xml) so hasn't been working with a
while?
St.Ack

On Wed, Sep 23, 2009 at 2:09 PM, Clint Morgan <clint.morgan@troove.net>wrote:

>  <property>
>    <name>hbase.regionserver.optionalcacheflushinterval</name>
>    <value>1800000</value>
>    <description>
>    Amount of time to wait since the last time a region was flushed before
>    invoking an optional cache flush (An optional cache flush is a
>    flush even though memcache is not at the memcache.flush.size).
>    Default: 30 minutes (in miliseconds)
>    </description>
>  </property>
>
> On Wed, Sep 23, 2009 at 1:41 PM, stack <stack@duboce.net> wrote:
>
> > Whats the option name Clint? I just checked out 0.19.0 and had a look in
> > hbase-default to try and jog my memory but I'm not sure which setting it
> is
> > (was).
> >
> > To force a flush you could do below in a cron job?
> >
> > echo "flush 'TABLENAME'" | ./bin/hbase shell
> >
> > ... or variations thereof.
> >
> > St.Ack
> >
> >
> > On Wed, Sep 23, 2009 at 1:23 PM, Clint Morgan <cm-public@troove.net>
> > wrote:
> >
> > > Is there no optional memstore flush anymore? I recall in 0.19 the
> > memcache
> > > would flush every so-often and you could configure this period
> (optional
> > > cache flush interval).
> > >
> > > Digging through now, I don't see it in 0.20. Is this mechanism no
> longer
> > > supported?
> > >
> > > Due to a couple of mixups, our stop cluster, take backup, restart
> cluster
> > > mechanism had stopped running for a while. So we were not
> force-flushing,
> > > nor generating enough data to flush.
> > > Then we had a crash and I realized that the on-file stores were missing
> > > writes from weeks ago. I eventually got the data back from the WAL.
> > >
> > > cheers,
> > > -clint
> > >
> >
>

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