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Flink and AWS S3 integration: java.lang.NullPointerException: null uri host


Hi, I'm trying to set up Checkpoints for Flink Jobs with S3 as a filesystem backend. I configured the following:

state.backend=filesystem
state.backend.fs.checkpointdir=s3:///mybucket/
state.checkpoints.dir=s3:///mybucket/
state.checkpoints.num-retained=3

I also copied the flink-s3-fs-hadoop-1.5.0.jar into the lib folder.

I get now though the following error message:

Caused by: java.lang.NullPointerException: null uri host.
    at java.util.Objects.requireNonNull(Objects.java:228)
    at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.fs.s3native.S3xLoginHelper.buildFSURI(S3xLoginHelper.java:65)
    at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.fs.s3a.S3AFileSystem.initialize(S3AFileSystem.java:165)
    at org.apache.flink.fs.s3hadoop.S3FileSystemFactory.create(S3FileSystemFactory.java:133)

I tried to dig deeper into the source code, but struggled to find 
  • what is meant with this URI
  • where to configure it
Can anybody give some advice how to set up the S3 Backend with the new shaded lib jar?

Thanks in advance
--

Fabian Wollert
Zalando SE

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