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From Ted Yu <yuzhih...@gmail.com>
Subject Re: HBase Exception: org.apache.hadoop.hbase.UnknownRowLockException
Date Fri, 28 Feb 2014 16:25:19 GMT
See this thread for previous discussion on RowLocks :

http://search-hadoop.com/m/b60Oj2IFfL3/Rowlocks+are+used+by+RegionServers&subj=Re+RowLocks


On Fri, Feb 28, 2014 at 1:09 AM, kaushik m <bigdatacslt@gmail.com> wrote:

> You should be passing the obtained rowLock object  as parameter for the
> Constructor of put object.
>
> On Friday, February 28, 2014, Shailesh Samudrala <shailesh2088@gmail.com>
> wrote:
>
> > >
> > > I'm running a sample code I wrote to test HBase lockRow() and
> > unlockRow() methods.
> > > The sample code is below:
> > >
> > > HTable table = new HTable(config, "test");
> > > RowLock rowLock = table.lockRow(Bytes.toBytes(row));
> > > System.out.println("Obtained rowlock on " + row + "\nRowLock: " +
> > rowLock);
> > >
> > > Put p = new Put(Bytes.toBytes(row));
> > > p.add(Bytes.toBytes("colFamily"), Bytes.toBytes(colFamily),
> > Bytes.toBytes(value));
> > > table.put(p);
> > > System.out.println("put row");
> > > table.unlockRow(rowLock);
> > > System.out.println("Unlocked row!");
> > >
> > >
> > >  When I execute my code, I get an UnknownRowLockException. The
> > > documentation says that this error is thrown when an unknown row lock
> is
> > > passed to the region servers. I'm not sure how this is happening & how
> to
> > > resolve it.
> > >
> > > The stack trace is below:
> > >
> > > Obtained rowlock on row2
> > > RowLock: org.apache.hadoop.hbase.client.RowLock@15af33d6
> > > put row
> > > Exception in thread "main"
> > org.apache.hadoop.hbase.UnknownRowLockException:
> > org.apache.hadoop.hbase.UnknownRowLockException: 5763272717012243790
> > >     at
> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.unlockRow(HRegionServer.java:2099)
> > >     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > >     at
> >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > >     at
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> > >     at java.lang.reflect.Method.invoke(Method.java:597)
> > >     at
> > org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:604)
> > >     at
> >
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1055)
> > >
> > >     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > Method)
> > >     at
> >
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> > >     at
> >
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> > >     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> > >     at
> >
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:96)
> > >     at
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.translateException(HConnectionManager.java:1268)
> > >     at
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithRetries(HConnectionManager.java:1014)
> > >     at org.apache.hadoop.hbase.client.HTable.unlockRow(HTable.java:870)
> > >     at HelloWorld.Hello.HelloWorld.main(HelloWorld.java:41)
> > >
> > >
> >
>

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