Alexander Malyga created BEAM-10113:
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Summary: PubSubIO readMessagesWithMessageId() breaks the payload
encoding when using DataflowRunner
Key: BEAM-10113
URL: https://issues.apache.org/jira/browse/BEAM-10113
Project: Beam
Issue Type: Bug
Components: io-java-gcp
Affects Versions: 2.20.0
Environment: Running locally on MacOS Catalina 10.15.4 and as a
Dataflow job in GCP.
Reporter: Alexander Malyga
Fix For: Not applicable
My pipeline reads PubSub messages and parses their payload to objects using
Gson. I use PubsubIO.readMessagesWithMessageId() to get the PubSub message and
the message ID.
I tested the pipeline thoroughly by running it with the DirectRunner in my
local machine and everything works fine, but when running it as a Dataflow job
in GCP using the DataflowRunner, Gson can't parse the messages properly because
the first character of the payload (opening bracket "{") is missing, this only
happens when using the DataflowRunner.
I noticed that the problem no longer happens when using PubsubIO.readStrings()
instead of PubsubIO.readMessagesWithMessageId() and getting the payload
directly (previously I had to decode the payload using new
String(element.getPayload(), StandardCharsets.UTF_8); )
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