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https://issues.apache.org/jira/browse/BEAM-5496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Cwik resolved BEAM-5496.
-----------------------------
Resolution: Fixed
Fix Version/s: 2.9.0
> MqttIO fails to deserialize checkpoint
> --------------------------------------
>
> Key: BEAM-5496
> URL: https://issues.apache.org/jira/browse/BEAM-5496
> Project: Beam
> Issue Type: Bug
> Components: io-java-mqtt
> Reporter: Luke Cwik
> Assignee: Island Chen
> Priority: Major
> Fix For: 2.9.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Source of bug report:
> [https://lists.apache.org/thread.html/3de5a946bcb539dea9f18a31f712d6af5b66f9fbb6b01eed452c5afb@%3Cdev.beam.apache.org%3E]
>
> There is a bug of the built-in MqttIO, please check the
> <https://github.com/apache/beam/blob/master/sdks/java/io/mqtt/src/main/java/org/apache/beam/sdk/io/mqtt/MqttIO.java#L336>,
> this readObject() method forget to invoke the "stream.defaultReadObject()"
> method.
>
> {code:java}
> // set an empty list to messages when deserialize
> private void readObject(java.io.ObjectInputStream stream)
> throws IOException, ClassNotFoundException {
> messages = new ArrayList<>();
> }{code}
>
> So there is an exception while the runner tried to deserialize the checkpoint
> object.
> {code:java}
> java.lang.RuntimeException: org.apache.beam.sdk.coders.CoderException: 95
> unexpected extra bytes after decoding
> org.apache.beam.sdk.io.mqtt.MqttIO$MqttCheckpointMark@6764e219
> at
> org.apache.beam.runners.direct.DirectRunner$DirectPipelineResult.waitUntilFinish(DirectRunner.java:340)
> ...{code}
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