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From "Eugene Kirpichov (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (BEAM-2406) NullPointerException when writing an empty table to BigQuery
Date Sat, 15 Jul 2017 17:06:00 GMT

     [ https://issues.apache.org/jira/browse/BEAM-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eugene Kirpichov closed BEAM-2406.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 2.1.0

> NullPointerException when writing an empty table to BigQuery
> ------------------------------------------------------------
>
>                 Key: BEAM-2406
>                 URL: https://issues.apache.org/jira/browse/BEAM-2406
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-gcp
>    Affects Versions: 2.0.0
>            Reporter: Ben Chambers
>            Assignee: Reuven Lax
>            Priority: Minor
>             Fix For: 2.1.0
>
>
> Originally reported on Stackoverflow:
> https://stackoverflow.com/questions/44314030/handling-empty-pcollections-with-bigquery-in-apache-beam
> It looks like if there is no data to write, then WritePartitions will return a null destination,
as explicitly stated in the comments:
> https://github.com/apache/beam/blob/v2.0.0/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/WritePartition.java#L126
> But, the ConstantTableDestination doesn't turn that into the constant destination as
the comment promises, instead it returns that `null` destination:
> https://github.com/apache/beam/blob/53c9bf4cd325035fabde192c63652ef6d591b93c/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/DynamicDestinationsHelpers.java#L74
> This leads to a null pointer error here since the `tableDestination` is that null result
from calling `getTable`:
> https://github.com/apache/beam/blob/v2.0.0/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/WriteTables.java#L97



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