@LifecycleStart
public void start() throws IOException {
synchronized (lock) {
if (started) {
return;
}
log.info("Starting zkCoordinator for server[%s]", me.getName());
final String loadQueueLocation = ZKPaths.makePath(zkPaths.getLoadQueuePath(), me.getName());
final String servedSegmentsLocation =
ZKPaths.makePath(zkPaths.getServedSegmentsPath(), me.getName());
final String liveSegmentsLocation =
ZKPaths.makePath(zkPaths.getLiveSegmentsPath(), me.getName());
loadQueueCache = new PathChildrenCache(curator, loadQueueLocation, true, true, loadingExec);
try {
curator.newNamespaceAwareEnsurePath(loadQueueLocation).ensure(curator.getZookeeperClient());
curator
.newNamespaceAwareEnsurePath(servedSegmentsLocation)
.ensure(curator.getZookeeperClient());
curator
.newNamespaceAwareEnsurePath(liveSegmentsLocation)
.ensure(curator.getZookeeperClient());
loadLocalCache();
loadQueueCache
.getListenable()
.addListener(
new PathChildrenCacheListener() {
@Override
public void childEvent(CuratorFramework client, PathChildrenCacheEvent event)
throws Exception {
final ChildData child = event.getData();
switch (event.getType()) {
case CHILD_ADDED:
final String path = child.getPath();
final DataSegmentChangeRequest request =
jsonMapper.readValue(child.getData(), DataSegmentChangeRequest.class);
log.info("New request[%s] with zNode[%s].", request.asString(), path);
try {
request.go(
getDataSegmentChangeHandler(),
new DataSegmentChangeCallback() {
boolean hasRun = false;
@Override
public void execute() {
try {
if (!hasRun) {
curator.delete().guaranteed().forPath(path);
log.info("Completed request [%s]", request.asString());
hasRun = true;
}
} catch (Exception e) {
try {
curator.delete().guaranteed().forPath(path);
} catch (Exception e1) {
log.error(
e1,
"Failed to delete zNode[%s], but ignoring exception.",
path);
}
log.error(e, "Exception while removing zNode[%s]", path);
throw Throwables.propagate(e);
}
}
});
} catch (Exception e) {
try {
curator.delete().guaranteed().forPath(path);
} catch (Exception e1) {
log.error(
e1, "Failed to delete zNode[%s], but ignoring exception.", path);
}
log.makeAlert(e, "Segment load/unload: uncaught exception.")
.addData("node", path)
.addData("nodeProperties", request)
.emit();
}
break;
case CHILD_REMOVED:
log.info("zNode[%s] was removed", event.getData().getPath());
break;
default:
log.info("Ignoring event[%s]", event);
}
}
});
loadQueueCache.start();
} catch (Exception e) {
Throwables.propagateIfPossible(e, IOException.class);
throw Throwables.propagate(e);
}
started = true;
}
}
@LifecycleStart
public void start() throws IOException {
log.info("Starting zkCoordinator for server[%s]", me);
synchronized (lock) {
if (started) {
return;
}
final String loadQueueLocation = ZKPaths.makePath(zkPaths.getLoadQueuePath(), me.getName());
final String servedSegmentsLocation =
ZKPaths.makePath(zkPaths.getServedSegmentsPath(), me.getName());
final String liveSegmentsLocation =
ZKPaths.makePath(zkPaths.getLiveSegmentsPath(), me.getName());
loadQueueCache =
new PathChildrenCache(
curator,
loadQueueLocation,
true,
true,
new ThreadFactoryBuilder().setDaemon(true).setNameFormat("ZkCoordinator-%s").build());
try {
config.getInfoDir().mkdirs();
curator.newNamespaceAwareEnsurePath(loadQueueLocation).ensure(curator.getZookeeperClient());
curator
.newNamespaceAwareEnsurePath(servedSegmentsLocation)
.ensure(curator.getZookeeperClient());
curator
.newNamespaceAwareEnsurePath(liveSegmentsLocation)
.ensure(curator.getZookeeperClient());
loadCache();
loadQueueCache
.getListenable()
.addListener(
new PathChildrenCacheListener() {
@Override
public void childEvent(CuratorFramework client, PathChildrenCacheEvent event)
throws Exception {
final ChildData child = event.getData();
switch (event.getType()) {
case CHILD_ADDED:
final String path = child.getPath();
final DataSegmentChangeRequest segment =
jsonMapper.readValue(child.getData(), DataSegmentChangeRequest.class);
log.info("New node[%s] with segmentClass[%s]", path, segment.getClass());
try {
segment.go(ZkCoordinator.this);
curator.delete().guaranteed().forPath(path);
log.info("Completed processing for node[%s]", path);
} catch (Exception e) {
try {
curator.delete().guaranteed().forPath(path);
} catch (Exception e1) {
log.info(
e1, "Failed to delete node[%s], but ignoring exception.", path);
}
log.makeAlert(e, "Segment load/unload: uncaught exception.")
.addData("node", path)
.addData("nodeProperties", segment)
.emit();
}
break;
case CHILD_REMOVED:
log.info("%s was removed", event.getData().getPath());
break;
default:
log.info("Ignoring event[%s]", event);
}
}
});
loadQueueCache.start();
} catch (Exception e) {
Throwables.propagateIfPossible(e, IOException.class);
throw Throwables.propagate(e);
}
started = true;
}
}