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From Kyle Hamlin <hamlin...@gmail.com>
Subject Re: BucketingSink broken in flink 1.4.0 ?
Date Wed, 10 Jan 2018 14:28:11 GMT
I'm having similar issues after moving from 1.3..2 to 1.4.0

*My mailing list thread: *BucketingSink doesn't work anymore moving from
1.3.2 to 1.4.0
<http://mail-archives.apache.org/mod_mbox/flink-user/201801.mbox/%3CCADAFrT8vonuRAhrrFwCen42wjojZ99LVGkhpyP2Qy0=7BLRxnQ@mail.gmail.com%3E>

I'm not actually using hdfs as my sink. I'll be using s3 as my final sink
but I get the following error even when I've given a local file path to the
BucketingSink.

java.lang.RuntimeException: Error while creating FileSystem when
initializing the state of the BucketingSink.
at
org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.initializeState(BucketingSink.java:358)
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:259)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:694)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:682)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:253)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Cannot instantiate file system for URI:
hdfs://localhost:12345/
at
org.apache.flink.runtime.fs.hdfs.HadoopFsFactory.create(HadoopFsFactory.java:187)
at
org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:401)
at
org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.createHadoopFileSystem(BucketingSink.java:1154)
at
org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.initFileSystem(BucketingSink.java:411)
at
org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.initializeState(BucketingSink.java:355)
... 9 more
Caused by: java.lang.ClassCastException






On Wed, Jan 10, 2018 at 1:39 PM Chesnay Schepler <chesnay@apache.org> wrote:

> Your analysis looks correct, the code in question will never properly
> detect hadoop file systems. I'll open a jira.
>
> Your suggestion to replace it with getUnguardedFileSystem() was my first
> instinct as well.
>
> Good job debugging this.
>
>
> On 10.01.2018 14:17, jelmer wrote:
>
> Hi I am trying to convert some jobs from flink 1.3.2 to flink 1.4.0
>
> But i am running into the issue that the bucketing sink will always try
> and connect to hdfs://localhost:12345/ instead of the hfds url i have
> specified in the constructor
>
> If i look at the code at
>
>
> https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-filesystem/src/main/java/org/apache/flink/streaming/connectors/fs/bucketing/BucketingSink.java#L1125
>
>
> It tries to create the hadoop filesystem like this
>
> final org.apache.flink.core.fs.FileSystem flinkFs =
> org.apache.flink.core.fs.FileSystem.get(path.toUri());
> final FileSystem hadoopFs = (flinkFs instanceof HadoopFileSystem) ?
> ((HadoopFileSystem) flinkFs).getHadoopFileSystem() : null;
>
> But FileSystem.getUnguardedFileSystem will always return a
>
>
> But FileSystem.get will always return a SafetyNetWrapperFileSystem so the
> instanceof check will never indicate that its a hadoop filesystem
>
>
> Am i missing something or is this a bug and if so what would be the
> correct fix ? I guess replacing FileSystem.get with
> FileSystem.getUnguardedFileSystem would fix it but I am afraid I lack the
> context to know if that would be safe
>
>
>

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