public HMasterInterface getMaster() throws MasterNotRunningException {
ZooKeeperWrapper zk = null;
try {
zk = getZooKeeperWrapper();
} catch (IOException e) {
throw new MasterNotRunningException(e);
}
HServerAddress masterLocation = null;
synchronized (this.masterLock) {
for (int tries = 0;
!this.closed &&
!this.masterChecked && this.master == null &&
tries < numRetries;
tries++) {
try {
masterLocation = zk.readMasterAddressOrThrow();
HMasterInterface tryMaster = (HMasterInterface)HBaseRPC.getProxy(
HMasterInterface.class, HBaseRPCProtocolVersion.versionID,
masterLocation.getInetSocketAddress(), this.conf);
if (tryMaster.isMasterRunning()) {
this.master = tryMaster;
break;
}
} catch (IOException e) {
if (tries == numRetries - 1) {
// This was our last chance - don't bother sleeping
LOG.info("getMaster attempt " + tries + " of " + this.numRetries +
" failed; no more retrying.", e);
break;
}
LOG.info("getMaster attempt " + tries + " of " + this.numRetries +
" failed; retrying after sleep of " +
getPauseTime(tries), e);
}
// Cannot connect to master or it is not running. Sleep & retry
try {
Thread.sleep(getPauseTime(tries));
} catch (InterruptedException e) {
// continue
}
}
this.masterChecked = true;
}
if (this.master == null) {
if (masterLocation == null) {
throw new MasterNotRunningException();
}
throw new MasterNotRunningException(masterLocation.toString());
}
return this.master;
}