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https://issues.apache.org/jira/browse/BEAM-2418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040045#comment-16040045
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Luke Cwik commented on BEAM-2418:
---------------------------------
It sounds like the way in which your packaging your application is not
correctly packaging files needed for Java's ServiceLoader.
Please take a look at
https://stackoverflow.com/questions/44365545/apache-beam-unable-to-find-registrar-for-gs
and instead of looking into
*META-INF/services/org.apache.beam.sdk.io.FileSystemRegistrar*, find whether
*META-INF/services/org.apache.beam.sdk.coders.CoderProviderRegistrar* contains
*org.apache.beam.sdk.extensions.protobuf.ProtobufCoderProviderRegistrar*.
> Datastore IO does not work out of the box
> -----------------------------------------
>
> Key: BEAM-2418
> URL: https://issues.apache.org/jira/browse/BEAM-2418
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-extensions, sdk-java-gcp
> Affects Versions: 2.0.0
> Reporter: Stephen Sisk
> Assignee: Vikas Kedigehalli
> Priority: Blocker
> Fix For: 2.1.0
>
>
> We have user reports that DatastoreIO does not work when they try to use it.
> We believe this is a result of our effort to minimize our dependencies in the
> core SDK (protobuf in this case). ProtoCoder is not registered by default, so
> a user would need explicitly include 'beam-sdks-java-extensions-protobuf' in
> their maven dependencies to get it.
> We need to confirm it, but if so, we will probably need to fix this in the
> next release to have ProtoCoder when using DatastoreIO.
> cc [~vikasrk]
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