/** Restart a dead avatar node as a standby avatar. */
public void restartStandby(int nnIndex) throws IOException {
AvatarInfo dead = getDeadAvatar(nnIndex);
if (getPrimaryAvatar(nnIndex) == null || dead == null) {
throw new IOException("cannot start standby avatar: " + "primary or dead avatar not found");
}
LOG.info("restarting " + dead.startupOption + " as standby");
NameNodeInfo nni = this.nameNodes[nnIndex];
String[] args;
ArrayList<String> argList = new ArrayList<String>();
argList.add(dead.startupOption);
argList.add(AvatarConstants.StartupOption.STANDBY.getName());
argList.add(AvatarConstants.StartupOption.REGULAR.getName());
if (federation) {
argList.add(StartupOption.SERVICE.getName());
argList.add(nni.nameserviceId);
}
args = new String[argList.size()];
argList.toArray(args);
dead.avatar = AvatarNode.createAvatarNode(args, getServerConf(dead.startupOption, nni));
dead.state = AvatarState.STANDBY;
if (dead.avatar == null) {
throw new IOException("cannot start avatar node");
}
}
/** Kill the standby avatar node. */
public void killStandby(int nnIndex) throws IOException {
AvatarInfo standby = getStandbyAvatar(nnIndex);
if (standby != null) {
standby.avatar.shutdownAvatar();
standby.avatar = null;
standby.state = AvatarState.DEAD;
try {
Thread.sleep(1000);
} catch (InterruptedException ignore) {
// do nothing
}
} else {
LOG.info("can't kill standby avatar, already dead");
}
}
/** Make standby avatar the new primary avatar. Kill the old primary avatar first if necessary. */
public void failOver(int nnIndex) throws IOException {
if (getPrimaryAvatar(nnIndex) != null) {
LOG.info("killing primary avatar before failover");
killPrimary(nnIndex);
}
AvatarInfo standby = getStandbyAvatar(nnIndex);
if (standby == null) {
throw new IOException("no standby avatar running");
}
standby.avatar.setAvatar(AvatarConstants.Avatar.ACTIVE);
standby.state = AvatarState.ACTIVE;
registerZooKeeperNode(
standby.nnPort,
standby.nnDnPort,
standby.httpPort,
standby.rpcPort,
this.nameNodes[nnIndex]);
}
/**
* Kill the primary avatar node.
*
* @param clearZK clear zookeeper?
*/
public void killPrimary(int nnIndex, boolean clearZK) throws IOException {
AvatarInfo primary = getPrimaryAvatar(nnIndex);
if (primary != null) {
if (clearZK) {
clearZooKeeperNode(nnIndex);
}
primary.avatar.shutdownAvatar();
primary.avatar = null;
primary.state = AvatarState.DEAD;
try {
Thread.sleep(1000);
} catch (InterruptedException ignore) {
// do nothing
}
} else {
throw new IOException("can't kill primary avatar, already dead");
}
}
