AsynchronousException {java.lang.Exception：无法为操作员实现检查点32726来源：
Hadoop：hadoop-2.8.5
Flink：flink-1.7.2-bin-hadoop28-scala_2.11
Hadoop集群正常且健康。
$ hdfs dfsadmin -safemode get
Safe mode is OFF
$ hdfs dfsadmin -report
Configured Capacity: 54716792832 (50.96 GB)
Present Capacity: 37640894006 (35.06 GB)
DFS Remaining: 37224263680 (34.67 GB)
DFS Used: 416630326 (397.33 MB)
DFS Used%: 1.11%
Under replicated blocks: 12
Blocks with corrupt replicas: 0
Missing blocks: 0
Missing blocks (with replication factor 1): 0
Pending deletion blocks: 0
-------------------------------------------------
Live datanodes (3):
Name: 192.168.13.73:50010 (slave1)
Hostname: slave1
Decommission Status : Normal
Configured Capacity: 18238930944 (16.99 GB)
DFS Used: 138713073 (132.29 MB)
Non DFS Used: 4678150159 (4.36 GB)
DFS Remaining: 13422067712 (12.50 GB)
DFS Used%: 0.76%
DFS Remaining%: 73.59%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Tue May 07 10:21:54 CST 2019
Name: 192.168.13.74:50010 (slave2)
Hostname: slave2
Decommission Status : Normal
Configured Capacity: 18238930944 (16.99 GB)
DFS Used: 139204370 (132.76 MB)
Non DFS Used: 7022983406 (6.54 GB)
DFS Remaining: 11076743168 (10.32 GB)
DFS Used%: 0.76%
DFS Remaining%: 60.73%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Tue May 07 10:21:52 CST 2019
Name: 192.168.13.75:50010 (slave3)
Hostname: slave3
Decommission Status : Normal
Configured Capacity: 18238930944 (16.99 GB)
DFS Used: 138712883 (132.29 MB)
Non DFS Used: 5374765261 (5.01 GB)
DFS Remaining: 12725452800 (11.85 GB)
DFS Used%: 0.76%
DFS Remaining%: 69.77%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Tue May 07 10:21:52 CST 2019
env.setStateBackend（（StateBackend）new FsStateBackend（hdfs_path））;
使用Flink Streaming Job正常运行约两天后。
FlinkSQL（rowtime）：HOP窗口（5分钟，1分钟）
重新启动作业后，数据会部分丢失。
异常详细信息：
AsynchronousException{java.lang.Exception: Could not materialize checkpoint 32726 for operator Source: Custom Source -> Filter -> Map -> Timestamps/Watermarks -> from: (...) -> time attribute: (rowtime) (1/3).}
at org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointExceptionHandler.tryHandleCheckpointException(StreamTask.java:1153)
at org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.handleExecutionException(StreamTask.java:947)
at org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.run(StreamTask.java:884)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.Exception: Could not materialize checkpoint 32726 for operator Source: Custom Source -> Filter -> Map -> Timestamps/Watermarks -> from: (...) -> time attribute: (rowtime) (1/3).
at org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.handleExecutionException(StreamTask.java:942)
... 6 more
Caused by: java.util.concurrent.ExecutionException: java.io.IOException: Could not flush and close the file system output stream to hdfs://master:9000/flink/checkpoints/PaycoreContextHopJob/0d71451e3fa1368e500175f9138d1e65/chk-32726/41598f08-35e4-4b9d-81c7-901a0c661fb2 in order to obtain the stream state handle
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.apache.flink.util.FutureUtil.runIfNotDoneAndGet(FutureUtil.java:53)
at org.apache.flink.streaming.api.operators.OperatorSnapshotFinalizer.<init>(OperatorSnapshotFinalizer.java:53)
at org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointRunnable.run(StreamTask.java:853)
... 5 more
Caused by: java.io.IOException: Could not flush and close the file system output stream to hdfs://master:9000/flink/checkpoints/PaycoreContextHopJob/0d71451e3fa1368e500175f9138d1e65/chk-32726/41598f08-35e4-4b9d-81c7-901a0c661fb2 in order to obtain the stream state handle
at org.apache.flink.runtime.state.filesystem.FsCheckpointStreamFactory$FsCheckpointStateOutputStream.closeAndGetHandle(FsCheckpointStreamFactory.java:326)
at org.apache.flink.runtime.state.DefaultOperatorStateBackend$DefaultOperatorStateBackendSnapshotStrategy$1.callInternal(DefaultOperatorStateBackend.java:767)
at org.apache.flink.runtime.state.DefaultOperatorStateBackend$DefaultOperatorStateBackendSnapshotStrategy$1.callInternal(DefaultOperatorStateBackend.java:696)
at org.apache.flink.runtime.state.AsyncSnapshotCallable.call(AsyncSnapshotCallable.java:76)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.flink.util.FutureUtil.runIfNotDoneAndGet(FutureUtil.java:50)
... 7 more
Caused by: org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /flink/checkpoints/PaycoreContextHopJob/0d71451e3fa1368e500175f9138d1e65/chk-32726/41598f08-35e4-4b9d-81c7-901a0c661fb2 could only be replicated to 0 nodes instead of minReplication (=1). There are 3 datanode(s) running and no node(s) are excluded in this operation.
at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1726)
at org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.chooseTargetForNewBlock(FSDirWriteFileOp.java:265)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2567)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:829)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:510)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:447)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:850)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:793)
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:1844)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2489)
at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1489)
at org.apache.hadoop.ipc.Client.call(Client.java:1435)
at org.apache.hadoop.ipc.Client.call(Client.java:1345)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
at com.sun.proxy.$Proxy17.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:444)
at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:409)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:346)
at com.sun.proxy.$Proxy18.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.DataStreamer.locateFollowingBlock(DataStreamer.java:1838)
at org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1638)
at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:704)