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HBase >> mail # user >> RegionServer shutdown with ScanWildcardColumnTracker exception


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Re: RegionServer shutdown with ScanWildcardColumnTracker exception
No. It happened in our production environment after running counters
increments every 5 minutes for a few weeks now. I could try to reproduce in
test cluster environment but that would mean running for weeks as well...
but I will keep digging and let you guys know if it happens again or / and
I have more information or insights on the issue.

Thanks.
On Wed, Apr 17, 2013 at 8:18 PM, ramkrishna vasudevan <
[EMAIL PROTECTED]> wrote:

> Is there any testcases that tries to reproduce your issue?
>
> Regards
> Ram
>
>
> On Wed, Apr 17, 2013 at 9:47 PM, ramkrishna vasudevan <
> [EMAIL PROTECTED]> wrote:
>
> > There is a hint mechanism available when scanning happens.  But i dont
> > think there should be much of difference between a scan that happens
> during
> > flush and the normal scan.
> >
> > Will look thro the code and come back on this.
> >
> > Regards
> > RAm
> >
> >
> > On Wed, Apr 17, 2013 at 9:40 PM, Amit Sela <[EMAIL PROTECTED]> wrote:
> >
> >> No, no encoding.
> >>
> >>
> >> On Wed, Apr 17, 2013 at 6:56 PM, ramkrishna vasudevan <
> >> [EMAIL PROTECTED]> wrote:
> >>
> >> > @Lars
> >> > You have any suggestions on this?
> >> >
> >> > @Amit
> >> > You have any Encoder enabled like the Prefix Encoding stuff?
> >> > There was one optimization added recently but that is not in 0.94.2
> >> >
> >> > Regards
> >> > Ram
> >> >
> >> >
> >> > On Wed, Apr 17, 2013 at 5:17 PM, Amit Sela <[EMAIL PROTECTED]>
> wrote:
> >> >
> >> > > I scanned over this counter with and without column specification
> and
> >> all
> >> > > looks OK now.
> >> > > I have no CPs in this table.
> >> > > Is there some kind of a hint mechanism in HBase' internal scan ?
> >> because
> >> > > it's weird that ScanWildcardColumnTracker.checkColumn says that
> >> column is
> >> > > smaller than previous column: *imprersions_ALL_2013041617*. there
> is
> >> no
> >> > > imprersions only impressions and r is indeed smaller than s, could
> it
> >> be
> >> > > some kind of hint bug ? I don't think I know enough of HBase
> >> internals to
> >> > > fully understand that...
> >> > >
> >> > >
> >> > >
> >> > > On Wed, Apr 17, 2013 at 1:42 PM, ramkrishna vasudevan <
> >> > > [EMAIL PROTECTED]> wrote:
> >> > >
> >> > > > Hi Amit
> >> > > >
> >> > > > Checking the code this is possible when the qualifiers are not
> >> sorted.
> >> > >  Do
> >> > > > you have any CPs in your path which tries to play with the KVs?
> >> > > >
> >> > > > Seems to be a very weird thing.
> >> > > > Can you try doing a scan on the KV just before this happens.  That
> >> will
> >> > > tel
> >> > > > you the existing kvs that are present.
> >> > > >
> >> > > > Even now if you can have the cluster you can try scanning for the
> >> > region
> >> > > > for which the flush happened.  That will give us some more info.
> >> > > >
> >> > > > Regards
> >> > > > Ram
> >> > > >
> >> > > >
> >> > > > On Wed, Apr 17, 2013 at 2:36 PM, Amit Sela <[EMAIL PROTECTED]>
> >> > wrote:
> >> > > >
> >> > > > > The cluster runs Hadoop 1.0.4 and HBase 0.94.2
> >> > > > >
> >> > > > > I have three families in this table: weekly, daily, hourly. each
> >> > family
> >> > > > has
> >> > > > > the following qualifiers:
> >> > > > > Weekly - impressions_{countrycode}_{week#} - country code is 0,
> 1
> >> or
> >> > > ALL
> >> > > > > (aggregation of both 0 and 1)
> >> > > > > Daily and hourly are the same but with yyyyMMdd and yyyyMMddhh
> >> > > > > respectively.
> >> > > > >
> >> > > > > Just before the exception the regionserver StoreFile executes
> the
> >> > > > > following:
> >> > > > >
> >> > > > > 2013-04-16 17:56:06,769 [regionserver8041.cacheFlusher] INFO
> >> > > > > org.apache.hadoop.hbase.regionserver.StoreFile: Delete Family
> >> Bloom
> >> > > > filter
> >> > > > > type for hdfs://
> >> > > > > hadoop-master.infolinks.com:8000/hbase/URL_COUNTERS/af2760e
> >> > > > > 4d04a9e3025d1fb53bdba8acf/.tmp/dc4ce516887f4e0bbaf6201d69ba90bc:
> >> > > > > CompoundBloomFilterWriter