diff options
Diffstat (limited to 'src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/KafkaLiveLockAvoider2.java')
-rw-r--r-- | src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/KafkaLiveLockAvoider2.java | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/KafkaLiveLockAvoider2.java b/src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/KafkaLiveLockAvoider2.java new file mode 100644 index 0000000..66ecc84 --- /dev/null +++ b/src/main/java/org/onap/dmaap/dmf/mr/backends/kafka/KafkaLiveLockAvoider2.java @@ -0,0 +1,158 @@ +/******************************************************************************* + * ============LICENSE_START======================================================= + * org.onap.dmaap + * ================================================================================ + * Copyright © 2017 AT&T Intellectual Property. All rights reserved. + * ================================================================================ + * Licensed 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. + * ============LICENSE_END========================================================= + * + * ECOMP is a trademark and service mark of AT&T Intellectual Property. + * + *******************************************************************************/ +package org.onap.dmaap.dmf.mr.backends.kafka; + + +import com.att.eelf.configuration.EELFLogger; +import com.att.eelf.configuration.EELFManager; +import org.apache.curator.framework.CuratorFramework; +import org.apache.curator.framework.recipes.locks.InterProcessMutex; +import org.apache.zookeeper.CreateMode; +import org.apache.zookeeper.Watcher; +import org.springframework.beans.factory.annotation.Autowired; +import org.springframework.beans.factory.annotation.Qualifier; +import org.springframework.stereotype.Component; + +import javax.annotation.PostConstruct; +import java.util.List; +import java.util.concurrent.TimeUnit; + +//@ComponentScan(basePackages="com.att.dmf.mr.backends.kafka") +@Component +public class KafkaLiveLockAvoider2 { + + public static final String ZNODE_ROOT = "/live-lock-avoid"; + public static final String ZNODE_LOCKS = "/locks"; + public static final String ZNODE_UNSTICK_TASKS ="/unstick-tasks"; + + private static String locksPath = ZNODE_ROOT+ZNODE_LOCKS; + private static String tasksPath = ZNODE_ROOT+ZNODE_UNSTICK_TASKS; + private static final EELFLogger log = EELFManager.getInstance().getLogger(KafkaLiveLockAvoider2.class.getName()); + + @Autowired + @Qualifier("curator") + private CuratorFramework curatorFramework; + + @PostConstruct + public void init() { + log.info("Welcome......................................................................................"); + try { + if (curatorFramework.checkExists().forPath(locksPath) == null) { + curatorFramework.create().creatingParentsIfNeeded().forPath(locksPath); + } + if (curatorFramework.checkExists().forPath(tasksPath) == null) { + curatorFramework.create().creatingParentsIfNeeded().forPath(tasksPath); + } + + } catch (Exception e) { + + log.error("Error during creation of permanent Znodes under /live-lock-avoid ",e); + + } + + + } + public void unlockConsumerGroup(String appId, String groupName) throws Exception { + + log.info("Signalling unlock to all conumsers of in group [{}] now, " , groupName); + + String fullLockPath = String.format("%s/%s", locksPath, groupName ); + String fullTasksPath = null; + + try { + + //Use the Curator recipe for a Mutex lock, only one process can be broadcasting unlock instructions for a group + InterProcessMutex lock = new InterProcessMutex(curatorFramework, fullLockPath); + if ( lock.acquire(100L, TimeUnit.MILLISECONDS) ) + { + try + { + List<String> taskNodes = curatorFramework.getChildren().forPath(tasksPath); + for (String taskNodeName : taskNodes) { + if(!taskNodeName.equals(appId)) { + + fullTasksPath = String.format("%s/%s/%s", tasksPath, taskNodeName, groupName); + log.info("Writing groupName {} to path {}",groupName, fullTasksPath); + + + if(curatorFramework.checkExists().forPath(fullTasksPath) != null) { + curatorFramework.delete().forPath(fullTasksPath); + } + curatorFramework.create().withMode(CreateMode.EPHEMERAL).forPath(fullTasksPath); + } + } + + + } + finally + { + //Curator lock recipe requires a acquire() to be followed by a release() + lock.release(); + } + }else { + log.info("Could not obtain the avoider lock, another process has the avoider lock? {}", !lock.isAcquiredInThisProcess() ); + } + + + } catch (Exception e) { + log.error("Error setting up either lock ZNode {} or task ZNode {}",fullLockPath, fullTasksPath,e); + throw e; + } + + + } + + /* + * Shoud be called once per MR server instance. + * + */ + public void startNewWatcherForServer(String appId, LiveLockAvoidance avoidanceCallback) { + LockInstructionWatcher instructionWatcher = new LockInstructionWatcher(curatorFramework,avoidanceCallback,this); + assignNewProcessNode(appId, instructionWatcher); + + } + + + protected void assignNewProcessNode(String appId, Watcher processNodeWatcher ) { + + String taskHolderZnodePath = ZNODE_ROOT+ZNODE_UNSTICK_TASKS+"/"+appId; + + + try { + + if(curatorFramework.checkExists().forPath(taskHolderZnodePath) != null) { + curatorFramework.delete().deletingChildrenIfNeeded().forPath(taskHolderZnodePath); + + } + curatorFramework.create().forPath(taskHolderZnodePath); + //setup the watcher + curatorFramework.getChildren().usingWatcher(processNodeWatcher).inBackground().forPath(taskHolderZnodePath); + log.info("Done creating task holder and watcher for APP name: {}",appId); + + } catch (Exception e) { + log.error("Could not add new processing node for name {}", appId, e); + } + + } + + +} |