Hi all，
我们在使用flink-1.10.1 on YARN(版本:
3.0.0-cdh6.3.2)的时候，使用StreamingFileSink时遇到异常信息，详细信息如下：
代码部分：
public static <IN> StreamingFileSink<IN> build(String dir,
BucketAssigner<IN, String> assigner, String prefix){
return StreamingFileSink.forRowFormat(new Path(dir), new
SimpleStringEncoder<IN>())
.withRollingPolicy(
DefaultRollingPolicy.builder()
.withRolloverInterval(TimeUnit.HOURS.toMillis(2))
.withInactivityInterval(TimeUnit.MINUTES.toMillis(10))
.withMaxPartSize(1024L * 1024L * 1024L * 50) // Max 50GB
.build()
)
.withBucketAssigner(assigner)
.withOutputFileConfig(OutputFileConfig.builder().withPartPrefix(prefix).build())
.build();
}
当任务执行一段时间后，会抛出异常：
java.io.IOException: Problem while truncating file:
hdfs:///home/2020-08-11/.home-69-71.inprogress.29cb86c7-a943-411f-aa22-6d12692ae523
at
org.apache.flink.runtime.fs.hdfs.HadoopRecoverableFsDataOutputStream.safelyTruncateFile(HadoopRecoverableFsDataOutputStream.java:168)
at
org.apache.flink.runtime.fs.hdfs.HadoopRecoverableFsDataOutputStream.<init>(HadoopRecoverableFsDataOutputStream.java:91)
at
org.apache.flink.runtime.fs.hdfs.HadoopRecoverableWriter.recover(HadoopRecoverableWriter.java:83)
at
org.apache.flink.streaming.api.functions.sink.filesystem.Bucket.restoreInProgressFile(Bucket.java:144)
at
org.apache.flink.streaming.api.functions.sink.filesystem.Bucket.<init>(Bucket.java:131)
at
org.apache.flink.streaming.api.functions.sink.filesystem.Bucket.restore(Bucket.java:407)
at
org.apache.flink.streaming.api.functions.sink.filesystem.DefaultBucketFactoryImpl.restoreBucket(DefaultBucketFactoryImpl.java:67)
at
org.apache.flink.streaming.api.functions.sink.filesystem.Buckets.handleRestoredBucketState(Buckets.java:182)
at
org.apache.flink.streaming.api.functions.sink.filesystem.Buckets.initializeActiveBuckets(Buckets.java:170)
at
org.apache.flink.streaming.api.functions.sink.filesystem.Buckets.initializeState(Buckets.java:154)
at
org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink.initializeState(StreamingFileSink.java:434)
at
org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)
at
org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)
at
org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:284)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.initializeStateAndOpen(StreamTask.java:989)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$0(StreamTask.java:453)
at
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$SynchronizedStreamTaskActionExecutor.runThrowing(StreamTaskActionExecutor.java:94)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:448)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:460)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:708)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:533)
at java.lang.Thread.run(Thread.java:748)
Caused by:
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException):
Failed to TRUNCATE_FILE
/home/2020-08-11/.shop_home_recommend-69-71.inprogress.29cb86c7-a943-411f-aa22-6d12692ae523
for DFSClient_NONMAPREDUCE_-1035692182_1 on 10.131.79.228 because
DFSClient_NONMAPREDUCE_-1035692182_1 is already the current lease holder.
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.recoverLeaseInternal(FSNamesystem.java:2522)
at
org.apache.hadoop.hdfs.server.namenode.FSDirTruncateOp.truncate(FSDirTruncateOp.java:119)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.truncate(FSNamesystem.java:2091)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.truncate(NameNodeRpcServer.java:1070)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.truncate(ClientNamenodeProtocolServerSideTranslatorPB.java:669)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:869)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:815)
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:1875)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2675)
at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1499)
at org.apache.hadoop.ipc.Client.call(Client.java:1445)
at org.apache.hadoop.ipc.Client.call(Client.java:1355)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
at com.sun.proxy.$Proxy10.truncate(Unknown Source)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.truncate(ClientNamenodeProtocolTranslatorPB.java:366)
at sun.reflect.GeneratedMethodAccessor146.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:422)
at
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165)
at
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157)
at
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359)
at com.sun.proxy.$Proxy11.truncate(Unknown Source)
at org.apache.hadoop.hdfs.DFSClient.truncate(DFSClient.java:1545)
at
org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:862)
at
org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:859)
at
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem.truncate(DistributedFileSystem.java:869)
at sun.reflect.GeneratedMethodAccessor145.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.apache.flink.runtime.fs.hdfs.HadoopRecoverableFsDataOutputStream.truncate(HadoopRecoverableFsDataOutputStream.java:203)
at
org.apache.flink.runtime.fs.hdfs.HadoopRecoverableFsDataOutputStream.safelyTruncateFile(HadoopRecoverableFsDataOutputStream.java:166)
... 22 more
根据错误堆栈信息和log信息，结合flink源码可以看到，是由于HadoopRecoverableFsDataOutputStream类的safelyTruncateFile方法中，waitUntilLeaseIsRevoked方法没有做到真正的等待hdfs文件租约取消，导致执行truncate代码的时候，拿不到文件租约而抛出异常。
[image: image.png]
在waitUntilLeaseIsRevoked方法中，while循环的判断条件是文件没有被关闭并且deadline还有剩余时间，但是实际情况中，文件没有关闭，但是deadline剩余时间已过，这个时候不会继续sleep等待，而是方法直接返回true，这个时候safelyTruncateFile没有任何判断而直接申请租约，这就会出现异常。
[image: image.png]
这个问题已经在Stack Overflow上提交了issue:
https://stackoverflow.com/questions/63027777/flink-streamingfilesink-fails-due-to-truncating-hdfs-file-failure
JIRA上提交了ticket:
https://stackoverflow.com/questions/63027777/flink-streamingfilesink-fails-due-to-truncating-hdfs-file-failure
谢谢。
王剑
