hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ted Yu <yuzhih...@gmail.com>
Subject Re: initial experience with HBase 0.90.1 rc0
Date Sun, 13 Feb 2011 16:44:31 GMT
I had 3 consecutive successful runs processing 200GB data for each run
before hitting timeout problem in the 4th run.

The 5th run couldn't proceed because master complained:

2011-02-13 16:11:45,173 FATAL org.apache.hadoop.hbase.master.HMaster: Failed
assignment of regions to
serverName=sjc1-hadoop6.sjc1.carrieriq.com,60020,1297518996557,
load=(requests=0, regions=231, usedHeap=3535, maxHeap=3983)

but sjc1-hadoop6.sjc1 claimed:
2011-02-13 16:13:32,258 DEBUG
org.apache.hadoop.hbase.regionserver.HRegionServer: No master found, will
retry

Here is stack trace for sjc1-hadoop6.sjc1:
http://pastebin.com/X8zWLXqu

I didn't have chance to capture master stack trace as master exited after
that.

I also attach master and region server log on sjc1-hadoop6.sjc1 - pardon me
for including individual email addresses as attachments wouldn't go through
hbase.apache.org

On Thu, Feb 10, 2011 at 5:05 PM, Todd Lipcon <todd@cloudera.com> wrote:

> On Thu, Feb 10, 2011 at 4:54 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>
> > Thanks for the explanation.
> > Assuming the mixed class loading is static, why did this situation
> develop
> > after 40 minutes of heavy load :-(
> >
>
> You didn't hit global memstore pressure until 40 minutes of load.
>
> -Todd
>
> On Thu, Feb 10, 2011 at 4:42 PM, Ryan Rawson <ryanobjc@gmail.com> wrote:
> >
> > > It's a standard linking issue, you get one class from one version
> > > another from another, they are mostly compatible in terms of
> > > signatures (hence no exceptions) but are subtly incompatible in
> > > different ways. In the stack trace you posted, the handlers were
> > > blocked in:
> > >
> > >        at
> > >
> >
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.reclaimMemStoreMemory(MemStoreFlusher.java:382)
> > >
> > > and the thread:
> > >
> > > "regionserver60020.cacheFlusher" daemon prio=10 tid=0x00002aaabc21e000
> > > nid=0x7717 waiting for monitor entry [0x0000000000000000]
> > >   java.lang.Thread.State: BLOCKED (on object monitor)
> > >
> > > was idle.
> > >
> > > The cache flusher thread should be flushing, and yet it's doing
> > > nothing.  This also happens to be one of the classes that were
> > > changed.
> > >
> > >
> > >
> > > On Thu, Feb 10, 2011 at 4:34 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> > > > Can someone comment on my second question ?
> > > > Thanks
> > > >
> > > > On Thu, Feb 10, 2011 at 4:25 PM, Ryan Rawson <ryanobjc@gmail.com>
> > wrote:
> > > >
> > > >> As I suspected.
> > > >>
> > > >> It's a byproduct of our maven assembly process. The process could
be
> > > >> fixed. I wouldn't mind. I don't support runtime checking of jars,
> > > >> there is such thing as too much tests, and this is an example of it.
> > > >> The check would then need a test, etc, etc.
> > > >>
> > > >> At SU we use new directories for each upgrade, copying the config
> > > >> over. With the lack of -default.xml this is easier than ever (just
> > > >> copy everything in conf/).  With symlink switchover it makes roll
> > > >> forward/back as simple as doing a symlink switchover or back. I have
> > > >> to recommend this to everyone who doesnt have a management scheme.
> > > >>
> > > >> On Thu, Feb 10, 2011 at 4:20 PM, Ted Yu <yuzhihong@gmail.com>
> wrote:
> > > >> > hbase/hbase-0.90.1.jar leads lib/hbase-0.90.0.jar in the
> classpath.
> > > >> > I wonder
> > > >> > 1. why hbase jar is placed in two directories - 0.20.6 didn't
use
> > such
> > > >> > structure
> > > >> > 2. what from lib/hbase-0.90.0.jar could be picked up and why
there
> > > wasn't
> > > >> > exception in server log
> > > >> >
> > > >> > I think a JIRA should be filed for item 2 above - bail out when
> the
> > > two
> > > >> > hbase jars from $HBASE_HOME and $HBASE_HOME/lib are of different
> > > >> versions.
> > > >> >
> > > >> > Cheers
> > > >> >
> > > >> > On Thu, Feb 10, 2011 at 3:40 PM, Ryan Rawson <ryanobjc@gmail.com>
> > > wrote:
> > > >> >
> > > >> >> What do you get when you:
> > > >> >>
> > > >> >> ls lib/hbase*
> > > >> >>
> > > >> >> I'm going to guess there is hbase-0.90.0.jar there
> > > >> >>
> > > >> >>
> > > >> >>
> > > >> >> On Thu, Feb 10, 2011 at 3:25 PM, Ted Yu <yuzhihong@gmail.com>
> > wrote:
> > > >> >> > hbase-0.90.0-tests.jar and hbase-0.90.1.jar co-exist
> > > >> >> > Would this be a problem ?
> > > >> >> >
> > > >> >> > On Thu, Feb 10, 2011 at 3:16 PM, Ryan Rawson <
> ryanobjc@gmail.com
> > >
> > > >> wrote:
> > > >> >> >
> > > >> >> >> You don't have both the old and the new hbase jars
in there do
> > > you?
> > > >> >> >>
> > > >> >> >> -ryan
> > > >> >> >>
> > > >> >> >> On Thu, Feb 10, 2011 at 3:12 PM, Ted Yu <yuzhihong@gmail.com>
> > > wrote:
> > > >> >> >> > .META. went offline during second flow attempt.
> > > >> >> >> >
> > > >> >> >> > The time out I mentioned happened for 1st and
3rd attempts.
> > > HBase
> > > >> was
> > > >> >> >> > restarted before the 1st and 3rd attempts.
> > > >> >> >> >
> > > >> >> >> > Here is jstack:
> > > >> >> >> > http://pastebin.com/EHMSvsRt
> > > >> >> >> >
> > > >> >> >> > On Thu, Feb 10, 2011 at 3:04 PM, Stack <stack@duboce.net>
> > > wrote:
> > > >> >> >> >
> > > >> >> >> >> So, .META. is not online?  What happens
if you use shell at
> > > this
> > > >> >> time.
> > > >> >> >> >>
> > > >> >> >> >> Your attachement did not come across Ted.
 Mind postbin'ing
> > it?
> > > >> >> >> >>
> > > >> >> >> >> St.Ack
> > > >> >> >> >>
> > > >> >> >> >> On Thu, Feb 10, 2011 at 2:41 PM, Ted Yu
<
> yuzhihong@gmail.com
> > >
> > > >> wrote:
> > > >> >> >> >> > I replaced hbase jar with hbase-0.90.1.jar
> > > >> >> >> >> > I also upgraded client side jar to
hbase-0.90.1.jar
> > > >> >> >> >> >
> > > >> >> >> >> > Our map tasks were running faster
than before for about
> 50
> > > >> minutes.
> > > >> >> >> >> However,
> > > >> >> >> >> > map tasks then timed out calling flushCommits().
This
> > > happened
> > > >> even
> > > >> >> >> after
> > > >> >> >> >> > fresh restart of hbase.
> > > >> >> >> >> >
> > > >> >> >> >> > I don't see any exception in region
server logs.
> > > >> >> >> >> >
> > > >> >> >> >> > In master log, I found:
> > > >> >> >> >> >
> > > >> >> >> >> > 2011-02-10 18:24:15,286 DEBUG
> > > >> >> >> >> >
> org.apache.hadoop.hbase.master.handler.OpenedRegionHandler:
> > > >> Opened
> > > >> >> >> region
> > > >> >> >> >> > -ROOT-,,0.70236052 on sjc1-hadoop6.X.com
> > ,60020,1297362251595
> > > >> >> >> >> > 2011-02-10 18:24:15,349 INFO
> > > >> >> >> >> org.apache.hadoop.hbase.catalog.CatalogTracker:
> > > >> >> >> >> > Failed verification of .META.,,1 at
address=null;
> > > >> >> >> >> > org.apache.hadoop.hbase.NotServingRegionException:
> > > >> >> >> >> > org.apache.hadoop.hbase.NotServingRegionException:
Region
> > is
> > > not
> > > >> >> >> online:
> > > >> >> >> >> > .META.,,1
> > > >> >> >> >> > 2011-02-10 18:24:15,350 DEBUG
> > > >> >> >> org.apache.hadoop.hbase.zookeeper.ZKAssign:
> > > >> >> >> >> > master:60000-0x12e10d0e31e0000 Creating
(or updating)
> > > unassigned
> > > >> >> node
> > > >> >> >> for
> > > >> >> >> >> > 1028785192 with OFFLINE state
> > > >> >> >> >> >
> > > >> >> >> >> > I am attaching region server (which
didn't respond to
> > > >> >> stop-hbase.sh)
> > > >> >> >> >> jstack.
> > > >> >> >> >> >
> > > >> >> >> >> > FYI
> > > >> >> >> >> >
> > > >> >> >> >> > On Thu, Feb 10, 2011 at 10:10 AM,
Stack <
> stack@duboce.net>
> > > >> wrote:
> > > >> >> >> >> >>
> > > >> >> >> >> >> Thats probably enough Ted.  The
0.90.1 hbase-default.xml
> > has
> > > an
> > > >> >> extra
> > > >> >> >> >> >> config. to enable the experimental
HBASE-3455 feature
> but
> > > you
> > > >> can
> > > >> >> >> copy
> > > >> >> >> >> >> that over if you want to try playing
with it (it
> defaults
> > > off
> > > >> so
> > > >> >> >> you'd
> > > >> >> >> >> >> copy over the config. if you wanted
to set it to true).
> > > >> >> >> >> >>
> > > >> >> >> >> >> St.Ack
> > > >> >> >> >> >
> > > >> >> >> >> >
> > > >> >> >> >>
> > > >> >> >> >
> > > >> >> >>
> > > >> >> >
> > > >> >>
> > > >> >
> > > >>
> > > >
> > >
> >
>
>
>
> --
> Todd Lipcon
> Software Engineer, Cloudera
>

Mime
View raw message