public void move(final byte[] encodedRegionName, final byte[] destServerName)
throws UnknownRegionException {
Pair<HRegionInfo, ServerName> p =
this.assignmentManager.getAssignment(encodedRegionName);
if (p == null)
throw new UnknownRegionException(Bytes.toStringBinary(encodedRegionName));
ServerName dest = null;
if (destServerName == null || destServerName.length == 0) {
LOG.info("Passed destination servername is null or empty so choosing a server at random");
List<ServerName> destServers = this.serverManager.getOnlineServersList();
destServers.remove(p.getSecond());
// If i have only one RS then destination can be null.
dest = balancer.randomAssignment(destServers);
} else {
dest = new ServerName(Bytes.toString(destServerName));
}
// Now we can do the move
RegionPlan rp = new RegionPlan(p.getFirst(), p.getSecond(), dest);
try {
checkInitialized();
if (this.cpHost != null) {
if (this.cpHost.preMove(p.getFirst(), p.getSecond(), dest)) {
return;
}
}
LOG.info("Added move plan " + rp + ", running balancer");
this.assignmentManager.balance(rp);
if (this.cpHost != null) {
this.cpHost.postMove(p.getFirst(), p.getSecond(), dest);
}
} catch (IOException ioe) {
UnknownRegionException ure = new UnknownRegionException(
Bytes.toStringBinary(encodedRegionName));
ure.initCause(ioe);
throw ure;
}
}