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From Shailesh Samudrala <shailesh2...@gmail.com>
Subject HBase Exception: org.apache.hadoop.hbase.UnknownRowLockException
Date Fri, 28 Feb 2014 06:01:43 GMT
>
> 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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