我正在尝试在已实现自定义可并行化套接字源的作业上使用保存点。来源看起来与此类似
@Override
public void run(SourceContext<String> sourceContext) throws Exception {
int idx = getRuntimeContext().getIndexOfThisSubtask();
String[] hosts = (config.hostsStr).split(":");
String[] portStrArr = (config.portsStr).split(":");
int[] ports = new int[portStrArr.length];
for (int i = 0; i < portStrArr.length; i++) {
ports[i] = Integer.parseInt(portStrArr[i]);
}
Socket s = new Socket(hosts[idx], ports[idx]);
BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
//ois = new ObjectInputStream(s.getInputStream());
while (running) {
String str = in.readLine();
sourceContext.collect(str);
}
sourceContext.close();
}
@Override
public void cancel() {
running = false;
}
群集上的异常看起来像这样
flink-1.1.3/bin//flink cancel -s hdfs://flink-master:19000/flink-checkpoints a18499a80099045eb5120ecacdabd421
Retrieving JobManager.
Using address flink-master/10.0.0.16:6123 to connect to JobManager.
Cancelling job a18499a80099045eb5120ecacdabd421 with savepoint to hdfs://flink-master:19000/flink-checkpoints.
java.lang.Exception: Canceling the job with ID a18499a80099045eb5120ecacdabd421 failed.
at org.apache.flink.client.CliFrontend.cancel(CliFrontend.java:637)
at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1092)
at org.apache.flink.client.CliFrontend$2.call(CliFrontend.java:1133)
at org.apache.flink.client.CliFrontend$2.call(CliFrontend.java:1130)
at org.apache.flink.runtime.security.HadoopSecurityContext$1.run(HadoopSecurityContext.java:43)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:40)
at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1130)
Caused by: java.lang.Exception: Failed to trigger savepoint.
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anon$6.apply(JobManager.scala:639)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anon$6.apply(JobManager.scala:629)
at org.apache.flink.runtime.concurrent.impl.FlinkFuture$5.onComplete(FlinkFuture.java:272)
at akka.dispatch.OnComplete.internal(Future.scala:247)
at akka.dispatch.OnComplete.internal(Future.scala:245)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:175)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:172)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.io.EOFException: Premature EOF: no length prefix available
at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:2282)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1347)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1266)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449)
Suppressed: java.lang.IllegalArgumentException: Self-suppression not permitted
at java.lang.Throwable.addSuppressed(Throwable.java:1043)
at java.io.FilterOutputStream.close(FilterOutputStream.java:159)
at org.apache.flink.runtime.checkpoint.savepoint.SavepointStore.storeSavepointToHandle(SavepointStore.java:207)
at org.apache.flink.runtime.checkpoint.savepoint.SavepointStore.storeSavepointToHandle(SavepointStore.java:150)
at org.apache.flink.runtime.checkpoint.PendingCheckpoint.finalizeCheckpointExternalized(PendingCheckpoint.java:281)
at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.completePendingCheckpoint(CheckpointCoordinator.java:888)
at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.receiveAcknowledgeMessage(CheckpointCoordinator.java:813)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$handleCheckpointMessage$1.apply$mcV$sp(JobManager.scala:1462)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$handleCheckpointMessage$1.apply(JobManager.scala:1461)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$handleCheckpointMessage$1.apply(JobManager.scala:1461)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
[CIRCULAR REFERENCE:java.io.EOFException: Premature EOF: no length prefix available]
在我的本地计算机上，以下异常拒绝保存点：
Cancelling job 4c99e0220c8c4683d1287269073b5c2c with savepoint to savepoints/.
java.lang.Exception: Canceling the job with ID 4c99e0220c8c4683d1287269073b5c2c failed.
at org.apache.flink.client.CliFrontend.cancel(CliFrontend.java:637)
at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1092)
at org.apache.flink.client.CliFrontend$2.call(CliFrontend.java:1133)
at org.apache.flink.client.CliFrontend$2.call(CliFrontend.java:1130)
at org.apache.flink.runtime.security.HadoopSecurityContext$1.run(HadoopSecurityContext.java:43)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:40)
at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1130)
Caused by: java.lang.Exception: Failed to trigger savepoint.
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anon$6.apply(JobManager.scala:639)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anon$6.apply(JobManager.scala:629)
at org.apache.flink.runtime.concurrent.impl.FlinkFuture$5.onComplete(FlinkFuture.java:272)
at akka.dispatch.OnComplete.internal(Future.scala:247)
at akka.dispatch.OnComplete.internal(Future.scala:245)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:175)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:172)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.Exception: Checkpoint was declined (tasks not ready)
at org.apache.flink.runtime.checkpoint.PendingCheckpoint.abortDeclined(PendingCheckpoint.java:510)
at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.receiveDeclineMessage(CheckpointCoordinator.java:735)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$handleCheckpointMessage$2.apply$mcV$sp(JobManager.scala:1491)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$handleCheckpointMessage$2.apply(JobManager.scala:1490)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$handleCheckpointMessage$2.apply(JobManager.scala:1490)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
... 6 more
是不是因为我的源无法正常停止，所以检查点不会发生？在群集上它确实说它成功并将位置返回到保存点但该路径上没有文件。
答案 0 :(得分：0)
鉴于源函数摘录，它对我来说几乎看起来不错。你应该做的是在检查点锁定下输出元素。否则，在触发检查点的同时输出元素时，可能会遇到问题。 SourceContext#getCheckpointLock确保这两项操作不会同时发生。
第一个错误看起来有点像在HDFS端有问题。你能检查一下日志是否含有可疑的东西吗？也许数据节点的磁盘空间不足。
第二个例外表明在执行检查点时出现了问题。 JobManager日志应包含一个日志语句，说明检查点失败的原因。它应该具有以下格式：丢弃检查点CHECKPOINT_ID，因为任务EXECUTION_ID：REASON 的检查点拒绝。