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152 changes: 152 additions & 0 deletions
152
core/src/main/java/org/apache/accumulo/core/lock/ServiceLockSupport.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| /* | ||
| * 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 | ||
| * | ||
| * https://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 org.apache.accumulo.core.lock; | ||
|
|
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| import java.util.function.Consumer; | ||
| import java.util.function.Supplier; | ||
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| import org.apache.accumulo.core.lock.ServiceLock.AccumuloLockWatcher; | ||
| import org.apache.accumulo.core.lock.ServiceLock.LockLossReason; | ||
| import org.apache.accumulo.core.lock.ServiceLock.LockWatcher; | ||
| import org.apache.accumulo.core.util.Halt; | ||
| import org.apache.zookeeper.KeeperException.NoAuthException; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| public class ServiceLockSupport { | ||
|
|
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| /** | ||
| * Lock Watcher used by Highly Available services. These are services where only instance is | ||
| * running at a time, but another backup service can be started that will be used if the active | ||
| * service instance fails and loses its lock in ZK. | ||
| */ | ||
| public static class HAServiceLockWatcher implements AccumuloLockWatcher { | ||
|
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| private static final Logger LOG = LoggerFactory.getLogger(HAServiceLockWatcher.class); | ||
|
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| private final String serviceName; | ||
| private volatile boolean acquiredLock = false; | ||
| private volatile boolean failedToAcquireLock = false; | ||
|
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| public HAServiceLockWatcher(String serviceName) { | ||
| this.serviceName = serviceName; | ||
| } | ||
|
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| @Override | ||
| public void lostLock(LockLossReason reason) { | ||
| Halt.halt(serviceName + " lock in zookeeper lost (reason = " + reason + "), exiting!", -1); | ||
| } | ||
|
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| @Override | ||
| public void unableToMonitorLockNode(final Exception e) { | ||
| // ACCUMULO-3651 Changed level to error and added FATAL to message for slf4j compatibility | ||
| Halt.halt(-1, | ||
| () -> LOG.error("FATAL: No longer able to monitor {} lock node", serviceName, e)); | ||
|
|
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| } | ||
|
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| @Override | ||
| public synchronized void acquiredLock() { | ||
| LOG.debug("Acquired {} lock", serviceName); | ||
|
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| if (acquiredLock || failedToAcquireLock) { | ||
| Halt.halt("Zoolock in unexpected state AL " + acquiredLock + " " + failedToAcquireLock, -1); | ||
| } | ||
|
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| acquiredLock = true; | ||
| notifyAll(); | ||
| } | ||
|
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| @Override | ||
| public synchronized void failedToAcquireLock(Exception e) { | ||
| LOG.warn("Failed to get {} lock", serviceName, e); | ||
|
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| if (e instanceof NoAuthException) { | ||
| String msg = | ||
| "Failed to acquire " + serviceName + " lock due to incorrect ZooKeeper authentication."; | ||
| LOG.error("{} Ensure instance.secret is consistent across Accumulo configuration", msg, e); | ||
| Halt.halt(msg, -1); | ||
| } | ||
|
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| if (acquiredLock) { | ||
| Halt.halt("Zoolock in unexpected state acquiredLock true with FAL " + failedToAcquireLock, | ||
| -1); | ||
| } | ||
|
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| failedToAcquireLock = true; | ||
| notifyAll(); | ||
| } | ||
|
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| public synchronized void waitForChange() { | ||
| while (!acquiredLock && !failedToAcquireLock) { | ||
| try { | ||
| LOG.info("{} lock held by someone else, waiting for a change in state", serviceName); | ||
| wait(); | ||
| } catch (InterruptedException e) { | ||
| // empty | ||
| } | ||
| } | ||
| } | ||
|
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| public boolean isLockAcquired() { | ||
| return acquiredLock; | ||
| } | ||
|
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| public boolean isFailedToAcquireLock() { | ||
| return failedToAcquireLock; | ||
| } | ||
|
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| } | ||
|
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| /** | ||
| * Lock Watcher used by non-HA services | ||
| */ | ||
| public static class ServiceLockWatcher implements LockWatcher { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(ServiceLockWatcher.class); | ||
|
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| private final String serviceName; | ||
| private final Supplier<Boolean> shuttingDown; | ||
| private final Consumer<String> lostLockAction; | ||
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| public ServiceLockWatcher(String serviceName, Supplier<Boolean> shuttingDown, | ||
| Consumer<String> lostLockAction) { | ||
| this.serviceName = serviceName; | ||
| this.shuttingDown = shuttingDown; | ||
| this.lostLockAction = lostLockAction; | ||
| } | ||
|
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| @Override | ||
| public void lostLock(final LockLossReason reason) { | ||
| Halt.halt(1, () -> { | ||
| if (!shuttingDown.get()) { | ||
| LOG.error("{} lost lock (reason = {}), exiting.", serviceName, reason); | ||
| } | ||
| lostLockAction.accept(serviceName); | ||
| }); | ||
| } | ||
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| @Override | ||
| public void unableToMonitorLockNode(final Exception e) { | ||
| Halt.halt(1, () -> LOG.error("Lost ability to monitor {} lock, exiting.", serviceName, e)); | ||
| } | ||
|
|
||
| } | ||
|
|
||
| } |
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