[
https://issues.apache.org/jira/browse/FLINK-22685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Moses updated FLINK-22685:
--------------------------
Description:
h3. Scence
I wanna luanch a batch job to process hive table data and write the result to
another table(*T1*), and my SQL statements is wriiten like below:
{code:sql}
-- use hive dialect
SET table.sql-dialect=hive;
-- insert into hive table
insert overwrite table T1
partition (p_day_id,p_file_id)
select distinct ....
{code}
The job was success luanched, but it failed on *Sink* operator. On Flink UI
page I saw all task state is `*FINISHED*`, but *the job failed and it restarted
again*.
And I found exception information like below: (*The path was marksed*)
{code:java}
java.lang.Exception: Failed to finalize execution on master
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.vertexFinished(ExecutionGraph.java:1291)
at
org.apache.flink.runtime.executiongraph.ExecutionVertex.executionFinished(ExecutionVertex.java:870)
at
org.apache.flink.runtime.executiongraph.Execution.markFinished(Execution.java:1125)
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.updateStateInternal(ExecutionGraph.java:1491)
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.updateState(ExecutionGraph.java:1464)
at
org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:497)
at
org.apache.flink.runtime.jobmaster.JobMaster.updateTaskExecutionState(JobMaster.java:386)
at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:284)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:199)
at
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:152)
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123)
at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
at akka.actor.Actor$class.aroundReceive(Actor.scala:517)
at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)
at akka.actor.ActorCell.invoke(ActorCell.scala:561)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
at akka.dispatch.Mailbox.run(Mailbox.scala:225)
at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at
akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: org.apache.flink.table.api.TableException: Exception in
finalizeGlobal
at
org.apache.flink.table.filesystem.FileSystemOutputFormat.finalizeGlobal(FileSystemOutputFormat.java:97)
at
org.apache.flink.runtime.jobgraph.InputOutputFormatVertex.finalizeOnMaster(InputOutputFormatVertex.java:132)
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.vertexFinished(ExecutionGraph.java:1286)
... 31 more
Caused by: java.io.FileNotFoundException: File
/XXXX/XX/XXX/.staging_1621244168369 does not exist.
at
org.apache.hadoop.hdfs.DistributedFileSystem.listStatusInternal(DistributedFileSystem.java:814)
at
org.apache.hadoop.hdfs.DistributedFileSystem.access$700(DistributedFileSystem.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:872)
at
org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:868)
at
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:868)
at
org.apache.hadoop.fs.FilterFileSystem.listStatus(FilterFileSystem.java:246)
at
org.apache.hadoop.fs.viewfs.ChRootedFileSystem.listStatus(ChRootedFileSystem.java:246)
at
org.apache.hadoop.fs.viewfs.ViewFileSystem.listStatus(ViewFileSystem.java:395)
at
org.apache.flink.hive.shaded.fs.hdfs.HadoopFileSystem.listStatus(HadoopFileSystem.java:169)
at
org.apache.flink.table.filesystem.PartitionTempFileManager.headCheckpoints(PartitionTempFileManager.java:140)
at
org.apache.flink.table.filesystem.FileSystemCommitter.commitUpToCheckpoint(FileSystemCommitter.java:98)
at
org.apache.flink.table.filesystem.FileSystemOutputFormat.finalizeGlobal(FileSystemOutputFormat.java:95)
... 33 more
{code}
h3. Assumption
According to the exception, I tracked the code and found that `.staging_`
directory may not be create. Thus, I try to add the following codes to fix it:
In *org.apache.flink.table.filesystem.FileSystemOutputFormat*
{code:java}
@Override
public void open(int taskNumber, int numTasks) throws IOException {
try {
// ---- Create directory if not exists here
final FileSystem fs = fsFactory.create(tmpPath.toUri());
if (!fs.exists(tmpPath)) {
fs.mkdirs(tmpPath);
}
PartitionTempFileManager fileManager = new
PartitionTempFileManager(
fsFactory, tmpPath, taskNumber, CHECKPOINT_ID,
outputFileConfig);
PartitionWriter.Context<T> context = new
PartitionWriter.Context<>(
parameters, formatFactory);
writer = PartitionWriterFactory.<T>get(
partitionColumns.length -
staticPartitions.size() > 0,
dynamicGrouped,
staticPartitions).create(context, fileManager,
computer);
} catch (Exception e) {
throw new TableException("Exception in open", e);
}
}
{code}
I rebuilt flink and execute my statements, and *it really worked*.
Did I used Flink SQL Client *not correctly*? Or this is a *BUG*?
Alse I found the flowing codes in
*org.apache.flink.connectors.hive.HiveTableSink* :
{code:java}
private String toStagingDir(String finalDir, Configuration conf) throws
IOException {
String res = finalDir;
if (!finalDir.endsWith(Path.SEPARATOR)) {
res += Path.SEPARATOR;
}
// TODO: may append something more meaningful than a timestamp, like
query ID
res += ".staging_" + System.currentTimeMillis();
Path path = new Path(res);
FileSystem fs = path.getFileSystem(conf);
Preconditions.checkState(
fs.exists(path) || fs.mkdirs(path), "Failed to create staging
dir " + path);
fs.deleteOnExit(path);
return res;
}
{code}
I guess the purpose of adding `fs.deleteOnExit(path)` is to clean up the dirty
data (while client is shuting down).
So shall I keep my Flink Client alive to wait for the job finish?
was:
h3. Scence
I wanna luanch a batch job to process hive table data and write the result to
another table(*T1*), and my SQL statements is wriiten like below:
{code:sql}
-- use hive dialect
SET table.sql-dialect=hive;
-- insert into hive table
insert overwrite table T1
partition (p_day_id,p_file_id)
select distinct ....
{code}
The job was success luanched, but it failed on *Sink* operator. On Flink UI
page I saw all task state is `*FINISHED*`, but *the job failed and it restarted
again*.
And I found exception information like below: (*The path was marksed*)
{code:}
java.lang.Exception: Failed to finalize execution on master
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.vertexFinished(ExecutionGraph.java:1291)
at
org.apache.flink.runtime.executiongraph.ExecutionVertex.executionFinished(ExecutionVertex.java:870)
at
org.apache.flink.runtime.executiongraph.Execution.markFinished(Execution.java:1125)
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.updateStateInternal(ExecutionGraph.java:1491)
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.updateState(ExecutionGraph.java:1464)
at
org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:497)
at
org.apache.flink.runtime.jobmaster.JobMaster.updateTaskExecutionState(JobMaster.java:386)
at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:284)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:199)
at
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)
at
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:152)
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123)
at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
at akka.actor.Actor$class.aroundReceive(Actor.scala:517)
at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)
at akka.actor.ActorCell.invoke(ActorCell.scala:561)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
at akka.dispatch.Mailbox.run(Mailbox.scala:225)
at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at
akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: org.apache.flink.table.api.TableException: Exception in
finalizeGlobal
at
org.apache.flink.table.filesystem.FileSystemOutputFormat.finalizeGlobal(FileSystemOutputFormat.java:97)
at
org.apache.flink.runtime.jobgraph.InputOutputFormatVertex.finalizeOnMaster(InputOutputFormatVertex.java:132)
at
org.apache.flink.runtime.executiongraph.ExecutionGraph.vertexFinished(ExecutionGraph.java:1286)
... 31 more
Caused by: java.io.FileNotFoundException: File
/XXXX/XX/XXX/.staging_1621244168369 does not exist.
at
org.apache.hadoop.hdfs.DistributedFileSystem.listStatusInternal(DistributedFileSystem.java:814)
at
org.apache.hadoop.hdfs.DistributedFileSystem.access$700(DistributedFileSystem.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:872)
at
org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:868)
at
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:868)
at
org.apache.hadoop.fs.FilterFileSystem.listStatus(FilterFileSystem.java:246)
at
org.apache.hadoop.fs.viewfs.ChRootedFileSystem.listStatus(ChRootedFileSystem.java:246)
at
org.apache.hadoop.fs.viewfs.ViewFileSystem.listStatus(ViewFileSystem.java:395)
at
org.apache.flink.hive.shaded.fs.hdfs.HadoopFileSystem.listStatus(HadoopFileSystem.java:169)
at
org.apache.flink.table.filesystem.PartitionTempFileManager.headCheckpoints(PartitionTempFileManager.java:140)
at
org.apache.flink.table.filesystem.FileSystemCommitter.commitUpToCheckpoint(FileSystemCommitter.java:98)
at
org.apache.flink.table.filesystem.FileSystemOutputFormat.finalizeGlobal(FileSystemOutputFormat.java:95)
... 33 more
{code}
h3. Assumption
According to the exception, I tracked the code and found that `.staging_`
directory may not be create. Thus, I try to add the following codes to fix it:
In *org.apache.flink.table.filesystem.FileSystemOutputFormat*
{code:java}
@Override
public void open(int taskNumber, int numTasks) throws IOException {
try {
final FileSystem fs = fsFactory.create(tmpPath.toUri());
if (!fs.exists(tmpPath)) {
fs.mkdirs(tmpPath);
}
PartitionTempFileManager fileManager = new
PartitionTempFileManager(
fsFactory, tmpPath, taskNumber, CHECKPOINT_ID,
outputFileConfig);
PartitionWriter.Context<T> context = new
PartitionWriter.Context<>(
parameters, formatFactory);
writer = PartitionWriterFactory.<T>get(
partitionColumns.length -
staticPartitions.size() > 0,
dynamicGrouped,
staticPartitions).create(context, fileManager,
computer);
} catch (Exception e) {
throw new TableException("Exception in open", e);
}
}
{code}
I rebuilt flink and execute my statements, and *it really worked*.
Did I used Flink SQL Client *not correctly*? Or this is a *BUG*?
Alse I found the flowing codes in
*org.apache.flink.connectors.hive.HiveTableSink* :
{code:java}
private String toStagingDir(String finalDir, Configuration conf) throws
IOException {
String res = finalDir;
if (!finalDir.endsWith(Path.SEPARATOR)) {
res += Path.SEPARATOR;
}
// TODO: may append something more meaningful than a timestamp, like
query ID
res += ".staging_" + System.currentTimeMillis();
Path path = new Path(res);
FileSystem fs = path.getFileSystem(conf);
Preconditions.checkState(
fs.exists(path) || fs.mkdirs(path), "Failed to create staging
dir " + path);
fs.deleteOnExit(path);
return res;
}
{code}
I guess the purpose of adding `fs.deleteOnExit(path)` is to clean up the dirty
data (while client is shuting down).
So shall I keep my Flink Client alive to wait for the job finish?
> Write data to hive table in batch mode throws FileNotFoundException.
> --------------------------------------------------------------------
>
> Key: FLINK-22685
> URL: https://issues.apache.org/jira/browse/FLINK-22685
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Hive
> Environment: Flink Based on Flink 1.11.1.
> Reporter: Moses
> Priority: Minor
>
> h3. Scence
> I wanna luanch a batch job to process hive table data and write the result to
> another table(*T1*), and my SQL statements is wriiten like below:
> {code:sql}
> -- use hive dialect
> SET table.sql-dialect=hive;
> -- insert into hive table
> insert overwrite table T1
> partition (p_day_id,p_file_id)
> select distinct ....
> {code}
> The job was success luanched, but it failed on *Sink* operator. On Flink UI
> page I saw all task state is `*FINISHED*`, but *the job failed and it
> restarted again*.
> And I found exception information like below: (*The path was marksed*)
> {code:java}
> java.lang.Exception: Failed to finalize execution on master
> at
> org.apache.flink.runtime.executiongraph.ExecutionGraph.vertexFinished(ExecutionGraph.java:1291)
> at
> org.apache.flink.runtime.executiongraph.ExecutionVertex.executionFinished(ExecutionVertex.java:870)
> at
> org.apache.flink.runtime.executiongraph.Execution.markFinished(Execution.java:1125)
> at
> org.apache.flink.runtime.executiongraph.ExecutionGraph.updateStateInternal(ExecutionGraph.java:1491)
> at
> org.apache.flink.runtime.executiongraph.ExecutionGraph.updateState(ExecutionGraph.java:1464)
> at
> org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:497)
> at
> org.apache.flink.runtime.jobmaster.JobMaster.updateTaskExecutionState(JobMaster.java:386)
> at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:497)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:284)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:199)
> at
> org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:152)
> at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
> at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
> at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123)
> at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
> at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)
> at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
> at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
> at akka.actor.Actor$class.aroundReceive(Actor.scala:517)
> at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)
> at akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)
> at akka.actor.ActorCell.invoke(ActorCell.scala:561)
> at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
> at akka.dispatch.Mailbox.run(Mailbox.scala:225)
> at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
> at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
> at
> akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
> at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
> at
> akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
> Caused by: org.apache.flink.table.api.TableException: Exception in
> finalizeGlobal
> at
> org.apache.flink.table.filesystem.FileSystemOutputFormat.finalizeGlobal(FileSystemOutputFormat.java:97)
> at
> org.apache.flink.runtime.jobgraph.InputOutputFormatVertex.finalizeOnMaster(InputOutputFormatVertex.java:132)
> at
> org.apache.flink.runtime.executiongraph.ExecutionGraph.vertexFinished(ExecutionGraph.java:1286)
> ... 31 more
> Caused by: java.io.FileNotFoundException: File
> /XXXX/XX/XXX/.staging_1621244168369 does not exist.
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.listStatusInternal(DistributedFileSystem.java:814)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.access$700(DistributedFileSystem.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:872)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:868)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:868)
> at
> org.apache.hadoop.fs.FilterFileSystem.listStatus(FilterFileSystem.java:246)
> at
> org.apache.hadoop.fs.viewfs.ChRootedFileSystem.listStatus(ChRootedFileSystem.java:246)
> at
> org.apache.hadoop.fs.viewfs.ViewFileSystem.listStatus(ViewFileSystem.java:395)
> at
> org.apache.flink.hive.shaded.fs.hdfs.HadoopFileSystem.listStatus(HadoopFileSystem.java:169)
> at
> org.apache.flink.table.filesystem.PartitionTempFileManager.headCheckpoints(PartitionTempFileManager.java:140)
> at
> org.apache.flink.table.filesystem.FileSystemCommitter.commitUpToCheckpoint(FileSystemCommitter.java:98)
> at
> org.apache.flink.table.filesystem.FileSystemOutputFormat.finalizeGlobal(FileSystemOutputFormat.java:95)
> ... 33 more
> {code}
> h3. Assumption
> According to the exception, I tracked the code and found that `.staging_`
> directory may not be create. Thus, I try to add the following codes to fix it:
> In *org.apache.flink.table.filesystem.FileSystemOutputFormat*
> {code:java}
> @Override
> public void open(int taskNumber, int numTasks) throws IOException {
> try {
> // ---- Create directory if not exists here
> final FileSystem fs = fsFactory.create(tmpPath.toUri());
> if (!fs.exists(tmpPath)) {
> fs.mkdirs(tmpPath);
> }
> PartitionTempFileManager fileManager = new
> PartitionTempFileManager(
> fsFactory, tmpPath, taskNumber, CHECKPOINT_ID,
> outputFileConfig);
> PartitionWriter.Context<T> context = new
> PartitionWriter.Context<>(
> parameters, formatFactory);
> writer = PartitionWriterFactory.<T>get(
> partitionColumns.length -
> staticPartitions.size() > 0,
> dynamicGrouped,
> staticPartitions).create(context, fileManager,
> computer);
> } catch (Exception e) {
> throw new TableException("Exception in open", e);
> }
> }
> {code}
> I rebuilt flink and execute my statements, and *it really worked*.
> Did I used Flink SQL Client *not correctly*? Or this is a *BUG*?
> Alse I found the flowing codes in
> *org.apache.flink.connectors.hive.HiveTableSink* :
> {code:java}
> private String toStagingDir(String finalDir, Configuration conf) throws
> IOException {
> String res = finalDir;
> if (!finalDir.endsWith(Path.SEPARATOR)) {
> res += Path.SEPARATOR;
> }
> // TODO: may append something more meaningful than a timestamp, like
> query ID
> res += ".staging_" + System.currentTimeMillis();
> Path path = new Path(res);
> FileSystem fs = path.getFileSystem(conf);
> Preconditions.checkState(
> fs.exists(path) || fs.mkdirs(path), "Failed to create staging
> dir " + path);
> fs.deleteOnExit(path);
> return res;
> }
> {code}
> I guess the purpose of adding `fs.deleteOnExit(path)` is to clean up the
> dirty data (while client is shuting down).
> So shall I keep my Flink Client alive to wait for the job finish?
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