I've opened a JIRA for this issue: https://issues.apache.org/jira/browse/FLINK-4870

On 20.10.2016 16:25, Radu Tudoran wrote:

Hi,

 

As you found the source of the error I am not sure if the outputs that you asked for are needed anymore. Nevertheless, see below

 

new File("D:\\dir\\myfile.csv").exists(); => true

 

FileSystem.getLocalFileSystem().getFileStatus(new Path(<relative path>)).getPath(); =>  “file:/D:/dir/myfile.csv”

 

 

Fabian’s suggestion of specifying the file like “"file:/D:/dir/myfile.csv"?” => works!

 

 

Nevertheless, IMHO I would suggest to fix the issue as it is in general more practical to specify paths in the form of D:\\dir\\myfile.csv  … mainly as it can be understood also by other file readers outside flink

 

 

From: Chesnay Schepler [mailto:chesnay@apache.org]
Sent: Thursday, October 20, 2016 4:06 PM
To: user@flink.apache.org
Subject: Re: org.apache.flink.core.fs.Path error?

 

I believe i found the issue. The ContinuousFileMonitoringFunction never converts the given string to a Path, but directly generates a URI from it.

On 20.10.2016 15:48, Fabian Hueske wrote:

The error message suggests that Flink tries to resolve "D:" as a file system schema such as "file:" or "hdfs:".


Can you try to use specify your path as "file:/D:/dir/myfile.csv"?

Best, Fabian

 

2016-10-20 14:41 GMT+02:00 Radu Tudoran <radu.tudoran@huawei.com>:

Hi,

 

I know that Flink in general supports files also on windows. For example I just tested successfully with relative file paths (e.g. place the file in the local directory and give just the file name then everything is working correctly). However with absolute paths it does not work as per my previous explanation. Nevertheless, please see also the error log below.

 

 

Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: Job execution failed.

     at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$8.apply$mcV$sp(JobManager.scala:822)

     at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$8.apply(JobManager.scala:768)

     at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$8.apply(JobManager.scala:768)

     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:41)

     at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:401)

     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.IOException: No file system found with scheme D, referenced in file URI 'D:/dir/myfile.csv'.

     at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:297)

     at org.apache.flink.streaming.api.functions.source.ContinuousFileMonitoringFunction.run(ContinuousFileMonitoringFunction.java:120)

     at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:80)

     at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:53)

     at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56)

     at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:266)

     at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584)

     at java.lang.Thread.run(Thread.java:745)

 

 

in addition to this there is some additional error if I dig through the output logs

 

 

4:33:32,651 ERROR org.apache.hadoop.util.Shell                                  - Failed to locate the winutils binary in the hadoop binary path

java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

     at org.apache.hadoop.util.Shell.getQualifiedBinPath(Shell.java:318)

     at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:333)

     at org.apache.hadoop.util.Shell.<clinit>(Shell.java:326)

     at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:76)

     at org.apache.hadoop.security.Groups.parseStaticMapping(Groups.java:92)

     at org.apache.hadoop.security.Groups.<init>(Groups.java:76)

     at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:239)

     at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:255)

     at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:232)

     at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:718)

     at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:703)

     at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:605)

     at org.apache.hadoop.fs.viewfs.ViewFileSystem.<init>(ViewFileSystem.java:130)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

     at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

     at java.lang.Class.newInstance(Class.java:379)

     at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:373)

     at java.util.ServiceLoader$1.next(ServiceLoader.java:445)

     at org.apache.hadoop.fs.FileSystem.loadFileSystems(FileSystem.java:2283)

     at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2294)

     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

     at java.lang.reflect.Method.invoke(Method.java:606)

     at org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.getDefaultHDFSClass(HadoopFileSystem.java:91)

     at org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.<init>(HadoopFileSystem.java:75)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

     at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

     at org.apache.flink.core.fs.FileSystem.instantiateHadoopFileSystemWrapper(FileSystem.java:334)

     at org.apache.flink.core.fs.FileSystem.getHadoopWrapperClassNameForFileSystem(FileSystem.java:358)

     at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:280)

     at org.apache.flink.streaming.api.functions.source.ContinuousFileMonitoringFunction.run(ContinuousFileMonitoringFunction.java:120)

     at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:80)

     at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:53)

     at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56)

     at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:266)

     at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584)

     at java.lang.Thread.run(Thread.java:745)

 

From: Chesnay Schepler [mailto:chesnay@apache.org]
Sent: Thursday, October 20, 2016 2:22 PM
To: user@flink.apache.org
Subject: Re: org.apache.flink.core.fs.Path error?

 

Hello Radu,

Flink can handle windows paths, this alone can't be the problem. If you could post the error you are getting we may pinpoint the issue,
but right now i would suggest the usual: check that the path is indeed correct, that you have sufficient permissions to access the file.

And yes, you can report problems here ;)

Regards,
Chesnay

On 20.10.2016 13:17, Radu Tudoran wrote:

Hi,

 

I am running a program that is suppose to read a CSV file from the local disk (I am still using Flink 1.1..i did not check if the situation is the same for 1.2). I am currently running the test on a windows OS.

I am creating the path to the file e.g. “D:\\dir\\myfile.csv”

However, I see that the CSV reader converts this to a Path object from flink core

 

“val inputFormat = new TupleCsvInputFormat(new Path(path), rowDelim, fieldDelim, typeInfo)”  In CSVTableSource

 

This ends up representing the initial path as an URI and changes \ to / resulting in ““D:/dir/myfile.csv””. The problem is that this is never changed when the file is actually open and accessed which leads to an error.

 

…not sure if signaling this error here is the best place or if I should have used some other media..

 

Best regards,

 

Dr. Radu Tudoran

Senior Research Engineer - Big Data Expert

IT R&D Division

 

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E-mail: radu.tudoran@huawei.com

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