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From Shailesh Samudrala <shailesh2...@gmail.com>
Subject HBase Exception: org.apache.hadoop.hbase.UnknownRowLockException
Date Fri, 28 Feb 2014 05:56:51 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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