Check this if it solves your problem : http://helpmetocode.blogspot.in/2012/05/issueif-you-master-machines-region.html
On Fri, May 25, 2012 at 7:25 PM, Kevin <[email protected]> wrote: > Hi, > > I'm starting to give coprocessors a try, but I'm having trouble getting the > HBase cluster to start up properly after deploying the new configuration. > My coprocessor is trivial, but it is only to get my feet wet. I override > the prePut method to add the row being put into a table into another table > as well. > > public class MyCustomRegionObserver extends BaseRegionObserver { > > public void prePut(final ObserverContext<RegionCoprocessorEnvironment> > e, > final Put put, final WALEdit edit, boolean writeToWAL) > throws IOException { > HTableInterface hti = > e.getEnvironment().getTable(Bytes.toBytes("accesses")); > try { > hti.put(new Put(put.getRow()).add(Bytes.toBytes("num"), > Bytes.toBytes("value"), Bytes.toBytes(0))); > } finally { > hti.close(); > } > } > > } > > I updated hbase-site.xml to reflect this coprocessor. > > <property> > <name>hbase.coprocessor.region.classes</name> > > <value>com.hbase.example.region.coprocessors.MyCustomRegionObserver</value> > </property> > > I update all the machines with the new configuration and I added the > coprocessor jar to /usr/lib/hbase/lib on each machine (I don't change the > default HBase classpath in hbase-env.sh) > > When I restart my HBase cluster the cluster does not ever finish assigning > META region. In the master's log there are a lot of > NotServingRegionExceptions: Region is not online: .META.,,1. Other than > that I can't see any log messages that indicate any specific about loading > the coprocessor. If I then comment out the coprocessor property in > hbase-site.xml and restart the cluster, then HBase starts up fine. > > I am new to coprocessors so any help is great. > > Thanks. > -- ∞ Shashwat Shriparv
