public void deleteMetaLocation(ZooKeeperWatcher zookeeper, int replicaId) throws KeeperException {
if (replicaId == HRegionInfo.DEFAULT_REPLICA_ID) {
LOG.info("Deleting hbase:meta region location in ZooKeeper");
} else {
LOG.info("Deleting hbase:meta for " + replicaId + " region location in ZooKeeper");
}
try {
// Just delete the node. Don't need any watches.
ZKUtil.deleteNode(zookeeper, zookeeper.getZNodeForReplica(replicaId));
} catch (KeeperException.NoNodeException nne) {
// Has already been deleted
}
}
/**
* Sets the location of <code>hbase:meta</code> in ZooKeeper to the specified server address.
*
* @param zookeeper
* @param serverName
* @param replicaId
* @param state
* @throws KeeperException
*/
public static void setMetaLocation(
ZooKeeperWatcher zookeeper, ServerName serverName, int replicaId, RegionState.State state)
throws KeeperException {
LOG.info("Setting hbase:meta region location in ZooKeeper as " + serverName);
// Make the MetaRegionServer pb and then get its bytes and save this as
// the znode content.
MetaRegionServer pbrsr =
MetaRegionServer.newBuilder()
.setServer(ProtobufUtil.toServerName(serverName))
.setRpcVersion(HConstants.RPC_CURRENT_VERSION)
.setState(state.convert())
.build();
byte[] data = ProtobufUtil.prependPBMagic(pbrsr.toByteArray());
try {
ZKUtil.setData(zookeeper, zookeeper.getZNodeForReplica(replicaId), data);
} catch (KeeperException.NoNodeException nne) {
if (replicaId == HRegionInfo.DEFAULT_REPLICA_ID) {
LOG.debug("META region location doesn't exist, create it");
} else {
LOG.debug("META region location doesn't exist for replicaId " + replicaId + ", create it");
}
ZKUtil.createAndWatch(zookeeper, zookeeper.getZNodeForReplica(replicaId), data);
}
}
/**
* Load the meta region state from the meta server ZNode.
*
* @param zkw
* @param replicaId
* @return regionstate
* @throws KeeperException
*/
public static RegionState getMetaRegionState(ZooKeeperWatcher zkw, int replicaId)
throws KeeperException {
RegionState.State state = RegionState.State.OPEN;
ServerName serverName = null;
try {
byte[] data = ZKUtil.getData(zkw, zkw.getZNodeForReplica(replicaId));
if (data != null && data.length > 0 && ProtobufUtil.isPBMagicPrefix(data)) {
try {
int prefixLen = ProtobufUtil.lengthOfPBMagic();
ZooKeeperProtos.MetaRegionServer rl =
ZooKeeperProtos.MetaRegionServer.PARSER.parseFrom(
data, prefixLen, data.length - prefixLen);
if (rl.hasState()) {
state = RegionState.State.convert(rl.getState());
}
HBaseProtos.ServerName sn = rl.getServer();
serverName = ServerName.valueOf(sn.getHostName(), sn.getPort(), sn.getStartCode());
} catch (InvalidProtocolBufferException e) {
throw new DeserializationException("Unable to parse meta region location");
}
} else {
// old style of meta region location?
serverName = ServerName.parseFrom(data);
}
} catch (DeserializationException e) {
throw ZKUtil.convert(e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
if (serverName == null) {
state = RegionState.State.OFFLINE;
}
return new RegionState(
RegionReplicaUtil.getRegionInfoForReplica(HRegionInfo.FIRST_META_REGIONINFO, replicaId),
state,
serverName);
}
