/*
* public synchronized ArrayList<Request> getWorkloadsList() {
* ArrayList<Request> workloads = new ArrayList<Request>();
*
* LOG.debug("Reading " + parentZnode +
* Constants.DEFAULT_ZOOKEEPER_ZNODE_WORKLOADS);
*
* try { List<String> children = getChildren(parentZnode +
* Constants.DEFAULT_ZOOKEEPER_ZNODE_WORKLOADS, null);
*
* if (!children.isEmpty()) { for (String child : children) { Request
* request = new Request(); String workloadZnode = parentZnode +
* Constants.DEFAULT_ZOOKEEPER_ZNODE_WORKLOADS + "/" + child; Stat stat =
* zkc.exists(workloadZnode, false); if (stat != null) { byte[] bytes =
* zkc.getData(workloadZnode, false, stat); try {
* deserializer.deserialize(request, bytes); workloads.add(request); } catch
* (TException e) { e.printStackTrace(); } } } } } catch (Exception e) {
* e.printStackTrace(); }
*
* return workloads; }
*/
public synchronized ArrayList<String> getClientsList() {
ArrayList<String> clients = new ArrayList<String>();
LOG.debug("Reading " + parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_CLIENTS);
try {
List<String> children =
getChildren(parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_CLIENTS, null);
if (!children.isEmpty()) {
for (String child : children) {
clients.add(child);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return clients;
}
private synchronized void getZkRunning() throws Exception {
LOG.debug("Reading " + parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING);
List<String> children =
getChildren(
parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING, new RunningWatcher());
if (!children.isEmpty()) {
for (String child : children) {
// If stop-wms.sh is executed and WMS_MANAGES_ZK then zookeeper
// is stopped abruptly.
// Second scenario is when ZooKeeper fails for some reason
// regardless of whether WMS
// manages it. When either happens the WmsServer running znodes
// still exist in ZooKeeper
// and we see them at next startup. When they eventually timeout
// we get node deleted events for a server that no longer
// exists. So, only recognize
// WmsServer running znodes that have timestamps after last
// WmsMaster startup.
Scanner scn = new Scanner(child);
scn.useDelimiter(":");
String hostName = scn.next();
String instance = scn.next();
int infoPort = Integer.parseInt(scn.next());
long serverStartTimestamp = Long.parseLong(scn.next());
scn.close();
if (serverStartTimestamp < startupTimestamp) continue;
if (!runningServers.contains(child)) {
LOG.debug("Watching running [" + child + "]");
zkc.exists(
parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING + "/" + child,
new RunningWatcher());
runningServers.add(child);
}
}
metrics.setTotalRunning(runningServers.size());
} else {
metrics.setTotalRunning(0);
}
}
private void getServersFile() throws Exception {
InputStream is = this.getClass().getResourceAsStream("/servers");
if (is == null) throw new IOException("Cannot find servers file");
BufferedReader br = new BufferedReader(new InputStreamReader(is));
configuredServers.clear();
String line;
while ((line = br.readLine()) != null) {
configuredServers.add(line);
}
Collections.sort(configuredServers);
if (configuredServers.size() < 1) throw new IOException("No entries found in servers file");
int lnum = 1;
for (int i = 0; i < configuredServers.size(); i++) {
LOG.debug("servers file line " + lnum + " [" + configuredServers.get(i) + "]");
lnum++;
}
}
private synchronized void restartServer(String znodePath) throws Exception {
String child =
znodePath.replace(
parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING + "/", "");
Scanner scn = new Scanner(child);
scn.useDelimiter(":");
String hostName = scn.next();
String instance = scn.next();
int infoPort = Integer.parseInt(scn.next());
long serverStartTimestamp = Long.parseLong(scn.next());
scn.close();
LOG.error("WmsServer [" + hostName + ":" + instance + "] failed.");
if (runningServers.contains(child)) {
LOG.debug("Found [" + child + "], deleting from running servers list");
runningServers.remove(child);
metrics.setTotalRunning(runningServers.size());
}
RestartHandler handler = new RestartHandler(child);
restartQueue.add(handler);
}
