public void moveSegment(
String from, String to, String segmentName, final LoadPeonCallback callback) {
try {
final DruidServer fromServer = serverInventoryView.getInventoryValue(from);
if (fromServer == null) {
throw new IAE("Unable to find server [%s]", from);
}
final DruidServer toServer = serverInventoryView.getInventoryValue(to);
if (toServer == null) {
throw new IAE("Unable to find server [%s]", to);
}
if (to.equalsIgnoreCase(from)) {
throw new IAE(
"Redundant command to move segment [%s] from [%s] to [%s]", segmentName, from, to);
}
final DataSegment segment = fromServer.getSegment(segmentName);
if (segment == null) {
throw new IAE("Unable to find segment [%s] on server [%s]", segmentName, from);
}
final LoadQueuePeon loadPeon = loadManagementPeons.get(to);
if (loadPeon == null) {
throw new IAE("LoadQueuePeon hasn't been created yet for path [%s]", to);
}
final LoadQueuePeon dropPeon = loadManagementPeons.get(from);
if (dropPeon == null) {
throw new IAE("LoadQueuePeon hasn't been created yet for path [%s]", from);
}
final ServerHolder toHolder = new ServerHolder(toServer, loadPeon);
if (toHolder.getAvailableSize() < segment.getSize()) {
throw new IAE(
"Not enough capacity on server [%s] for segment [%s]. Required: %,d, available: %,d.",
to, segment, segment.getSize(), toHolder.getAvailableSize());
}
final String toLoadQueueSegPath =
ZKPaths.makePath(ZKPaths.makePath(zkPaths.getLoadQueuePath(), to), segmentName);
final String toServedSegPath =
ZKPaths.makePath(
ZKPaths.makePath(
serverInventoryView.getInventoryManagerConfig().getInventoryPath(), to),
segmentName);
loadPeon.loadSegment(
segment,
new LoadPeonCallback() {
@Override
protected void execute() {
try {
if (curator.checkExists().forPath(toServedSegPath) != null
&& curator.checkExists().forPath(toLoadQueueSegPath) == null
&& !dropPeon.getSegmentsToDrop().contains(segment)) {
dropPeon.dropSegment(segment, callback);
} else if (callback != null) {
callback.execute();
}
} catch (Exception e) {
throw Throwables.propagate(e);
}
}
});
} catch (Exception e) {
log.makeAlert(e, "Exception moving segment %s", segmentName).emit();
callback.execute();
}
}
@Override
public int compareTo(ServerHolder serverHolder) {
return getAvailableSize().compareTo(serverHolder.getAvailableSize());
}
