STORM-166:Nimbus HA solution based on Zookeeper #61
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| Original file line number | Diff line number | Diff line change |
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| ;; Licensed to the Apache Software Foundation (ASF) under one | ||
| ;; or more contributor license agreements. See the NOTICE file | ||
| ;; distributed with this work for additional information | ||
| ;; regarding copyright ownership. The ASF licenses this file | ||
| ;; to you under the Apache License, Version 2.0 (the | ||
| ;; "License"); you may not use this file except in compliance | ||
| ;; with the License. You may obtain a copy of the License at | ||
| ;; | ||
| ;; http://www.apache.org/licenses/LICENSE-2.0 | ||
| ;; | ||
| ;; Unless required by applicable law or agreed to in writing, software | ||
| ;; distributed under the License is distributed on an "AS IS" BASIS, | ||
| ;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| ;; See the License for the specific language governing permissions and | ||
| ;; limitations under the License. | ||
| (ns backtype.storm.nimbus.leadership | ||
|
There was a problem hiding this comment. This needs an apache license header. |
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| (:import [backtype.storm.nimbus NimbusLeadership]) | ||
| (:use [backtype.storm log])) | ||
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| (defn nimbus-leadership [conf] | ||
| (NimbusLeadership. conf)) | ||
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| (defn get-nimbus-leader-address [conf] | ||
| (.getNimbusLeaderAddress (nimbus-leadership conf))) | ||
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| (defn get-nimbus-hosts [conf] | ||
| (.getNimbusHosts (nimbus-leadership conf))) | ||
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There was a problem hiding this comment. We never call close on the nimbus-leadership. I believe that we are leaking a connection to ZK every time this this and get-nimbus-leader-address is called. There was a problem hiding this comment. The connection to ZK is closed when nimbus shutdown. Considering the "nimbus-leadership" function is only called in "service-handler" in nimbus.clj to acquire leadership when nimbus launching, the relative codes are placed at the end of "service-handler" as "(.close nimbus-leadership)" There was a problem hiding this comment. I see it now you are right. |
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| (defn acquire-leadership [nimbus-leadership] | ||
| (when-let [nimbus-leader-address (.getNimbusLeaderAddress nimbus-leadership)] | ||
| (log-message "Current Nimbus Leader: " nimbus-leader-address)) | ||
| (log-message "acquiring nimbus leadership...") | ||
| (.acquireLeaderShip nimbus-leadership) | ||
| (log-message "acuqired nimbus leadership!")) | ||
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| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package backtype.storm.nimbus; | ||
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| import java.io.UnsupportedEncodingException; | ||
| import java.net.InetAddress; | ||
| import java.net.InetSocketAddress; | ||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import org.apache.curator.framework.CuratorFramework; | ||
| import org.apache.curator.framework.recipes.locks.InterProcessMutex; | ||
| import org.apache.curator.utils.ZKPaths; | ||
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| import backtype.storm.Config; | ||
| import backtype.storm.utils.Utils; | ||
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| @SuppressWarnings("rawtypes") | ||
| public class NimbusLeadership { | ||
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| private static final String STORM_NIMBUS_LEADERSHIP_PATH = "/nimbus/leadership"; | ||
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| private Map conf; | ||
| private CuratorFramework curator; | ||
| private InterProcessMutex mutex; | ||
| private boolean isLeader = false; | ||
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| public NimbusLeadership(final Map conf) { | ||
| this.conf = conf; | ||
| } | ||
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| public void acquireLeaderShip() throws Exception { | ||
| String nimbusHostName = InetAddress.getLocalHost().getCanonicalHostName(); | ||
| Object nimbusPort = conf.get(Config.NIMBUS_THRIFT_PORT); | ||
| String nodeId = nimbusHostName + ":" + nimbusPort.toString(); | ||
| initCurator(); | ||
| initLeadershipMutex(nodeId); | ||
| mutex.acquire(); | ||
| isLeader = true; | ||
| } | ||
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| public InetSocketAddress getNimbusLeaderAddress() throws Exception { | ||
| InetSocketAddress leaderAddress = null; | ||
| initCurator(); | ||
| initLeadershipMutex(null); | ||
| Collection<String> nimbusNodesPath = mutex.getParticipantNodes(); | ||
| if (nimbusNodesPath.size() > 0) { | ||
| leaderAddress = parseAddress(nimbusNodesPath.iterator().next()); | ||
| } | ||
| close(); | ||
| return leaderAddress; | ||
| } | ||
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| public List<InetSocketAddress> getNimbusHosts() throws Exception { | ||
| List<InetSocketAddress> nimbusAddressList = new ArrayList<InetSocketAddress>(); | ||
| initCurator(); | ||
| initLeadershipMutex(null); | ||
| Collection<String> nimbusNodesPath = mutex.getParticipantNodes(); | ||
| for (String nimbusNodePath : nimbusNodesPath) { | ||
| nimbusAddressList.add(parseAddress(nimbusNodePath)); | ||
| } | ||
| close(); | ||
| return nimbusAddressList; | ||
| } | ||
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| public void close() { | ||
| if (isLeader) { | ||
| try { | ||
| mutex.release(); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException("Exception while releasing mutex", e); | ||
| } | ||
| } | ||
| curator.close(); | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| private void initCurator() throws Exception { | ||
| List<String> servers = (List<String>) conf.get(Config.STORM_ZOOKEEPER_SERVERS); | ||
| Object port = conf.get(Config.STORM_ZOOKEEPER_PORT); | ||
| this.curator = Utils.newCuratorStarted(conf, servers, port); | ||
| } | ||
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| private void initLeadershipMutex(final String nodeId) throws Exception { | ||
| String path = (String) conf.get(Config.STORM_ZOOKEEPER_ROOT) + STORM_NIMBUS_LEADERSHIP_PATH; | ||
| ZKPaths.mkdirs(curator.getZookeeperClient().getZooKeeper(), path); | ||
| mutex = new InterProcessMutex(curator, path) { | ||
| @Override | ||
| protected byte[] getLockNodeBytes() { | ||
| try { | ||
| return nodeId == null ? null : nodeId.getBytes("UTF-8"); | ||
| } catch (UnsupportedEncodingException e) { | ||
| throw new RuntimeException("UTF-8 isn't supported", e); | ||
| } | ||
| } | ||
| }; | ||
| } | ||
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| private InetSocketAddress parseAddress(String nimbusNodePath) throws Exception { | ||
| String nimbusNodeData = new String(curator.getData().forPath(nimbusNodePath), "UTF-8"); | ||
| String[] split = nimbusNodeData.split(":"); | ||
| return new InetSocketAddress(split[0], Integer.parseInt(split[1])); | ||
| } | ||
| } |
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if nimbus.host is not used any more we should either deprecate it or just remove it.
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nimbus.host relative config should be removed all over the source codes. I will fix this.