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https://issues.apache.org/jira/browse/FLINK-33694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17792901#comment-17792901
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Patrick Lucas commented on FLINK-33694:
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I've updated the PR to more explicitly look for the specific Hadoop connector
config for this option instead of defining it as a Flink {{{}ConfigOption{}}}.
> GCS filesystem does not respect gs.storage.root.url config option
> -----------------------------------------------------------------
>
> Key: FLINK-33694
> URL: https://issues.apache.org/jira/browse/FLINK-33694
> Project: Flink
> Issue Type: Bug
> Components: FileSystems
> Affects Versions: 1.18.0, 1.17.2
> Reporter: Patrick Lucas
> Priority: Major
> Labels: gcs, pull-request-available
>
> The GCS FileSystem's RecoverableWriter implementation uses the GCS SDK
> directly rather than going through Hadoop. While support has been added to
> configure credentials correctly based on the standard Hadoop implementation
> configuration, no other options are passed through to the underlying client.
> Because this only affects the RecoverableWriter-related codepaths, it can
> result in very surprising differing behavior whether the FileSystem is being
> used as a source or a sink—while a {{{}gs://{}}}-URI FileSource may work
> fine, a {{{}gs://{}}}-URI FileSink may not work at all.
> We use [fake-gcs-server|https://github.com/fsouza/fake-gcs-server] in
> testing, and so we override the Hadoop GCS FileSystem config option
> {{{}gs.storage.root.url{}}}. However, because this option is not considered
> when creating the GCS client for the RecoverableWriter codepath, in a
> FileSink the GCS FileSystem attempts to write to the real GCS service rather
> than fake-gcs-server. At the same time, a FileSource works as expected,
> reading from fake-gcs-server.
> The fix should be fairly straightforward, reading the {{gs.storage.root.url}}
> config option from the Hadoop FileSystem config in
> [{{GSFileSystemOptions}}|https://github.com/apache/flink/blob/release-1.18.0/flink-filesystems/flink-gs-fs-hadoop/src/main/java/org/apache/flink/fs/gs/GSFileSystemOptions.java#L30]
> and, if set, passing it to {{storageOptionsBuilder}} in
> [{{GSFileSystemFactory}}|https://github.com/apache/flink/blob/release-1.18.0/flink-filesystems/flink-gs-fs-hadoop/src/main/java/org/apache/flink/fs/gs/GSFileSystemFactory.java].
> The only workaround for this is to build a custom flink-gs-fs-hadoop JAR with
> a patch and use it as a plugin.
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