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HBase >> mail # user >> .META. region server DDOSed by too many clients


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Varun Sharma 2012-12-05, 23:51
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lars hofhansl 2012-12-06, 00:20
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Varun Sharma 2012-12-06, 00:37
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Varun Sharma 2012-12-06, 00:40
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Anoop Sam John 2012-12-06, 04:25
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Re: .META. region server DDOSed by too many clients
Is block cache ON?  Check out HBASe-5898?

Regards
Ram

On Thu, Dec 6, 2012 at 9:55 AM, Anoop Sam John <[EMAIL PROTECTED]> wrote:

>
> >is the META table cached just like other tables
> Yes Varun I think so.
>
> -Anoop-
> ________________________________________
> From: Varun Sharma [[EMAIL PROTECTED]]
> Sent: Thursday, December 06, 2012 6:10 AM
> To: [EMAIL PROTECTED]; lars hofhansl
> Subject: Re: .META. region server DDOSed by too many clients
>
> We only see this on the .META. region not otherwise...
>
> On Wed, Dec 5, 2012 at 4:37 PM, Varun Sharma <[EMAIL PROTECTED]> wrote:
>
> > I see but is this pointing to the fact that we are heading to disk for
> > scanning META - if yes, that would be pretty bad, no ? Currently I am
> > trying to see if the freeze coincides with Block Cache being full (we
> have
> > an inmemory column) - is the META table cached just like other tables ?
> >
> > Varun
> >
> >
> > On Wed, Dec 5, 2012 at 4:20 PM, lars hofhansl <[EMAIL PROTECTED]>
> wrote:
> >
> >> Looks like you're running into HBASE-5898.
> >>
> >>
> >>
> >> ----- Original Message -----
> >> From: Varun Sharma <[EMAIL PROTECTED]>
> >> To: [EMAIL PROTECTED]
> >> Cc:
> >> Sent: Wednesday, December 5, 2012 3:51 PM
> >> Subject: .META. region server DDOSed by too many clients
> >>
> >> Hi,
> >>
> >> I am running hbase 0.94.0 and I have a significant write load being put
> on
> >> a table with 98 regions on a 15 node cluster - also this write load
> comes
> >> from a very large number of clients (~ 1000). I am running with 10
> >> priority
> >> IPC handlers and 200 IPC handlers. It seems the region server holding
> >> .META
> >> is DDOSed. All the 200 handlers are busy serving the .META. region and
> >> they
> >> are all locked onto on object. The Jstack is here for the regoin server
> >>
> >> "IPC Server handler 182 on 60020" daemon prio=10 tid=0x00007f329872c800
> >> nid=0x4401 waiting on condition [0x00007f328807f000]
> >>    java.lang.Thread.State: WAITING (parking)
> >>         at sun.misc.Unsafe.park(Native Method)
> >>         - parking to wait for  <0x0000000542d72e30> (a
> >> java.util.concurrent.locks.ReentrantLock$NonfairSync)
> >>         at
> >> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> >>         at
> >>
> >>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:838)
> >>         at
> >>
> >>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:871)
> >>         at
> >>
> >>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1201)
> >>         at
> >>
> >>
> java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
> >>         at
> >> java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
> >>         at
> >>
> >>
> java.util.concurrent.ConcurrentHashMap$Segment.put(ConcurrentHashMap.java:445)
> >>         at
> >>
> >>
> java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:925)
> >>         at
> >> org.apache.hadoop.hbase.util.IdLock.getLockEntry(IdLock.java:71)
> >>         at
> >>
> >>
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:290)
> >>         at
> >>
> >>
> org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.seekToDataBlock(HFileBlockIndex.java:213)
> >>         at
> >>
> >>
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:455)
> >>         at
> >>
> >>
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.reseekTo(HFileReaderV2.java:493)
> >>         at
> >>
> >>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseekAtOrAfter(StoreFileScanner.java:242)
> >>         at
> >>
> >>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:167)
> >>         at
> >>
> >>
> org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.doRealSeek(NonLazyKeyValueScanner.java:54)
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Varun Sharma 2012-12-06, 10:32
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ramkrishna vasudevan 2012-12-06, 10:59
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Varun Sharma 2012-12-06, 11:29
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ramkrishna vasudevan 2012-12-06, 11:52
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Varun Sharma 2012-12-06, 00:05