Hari Shreedharan created SPARK-4707:
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Summary: Reliable Kafka Receiver can lose data if the block
generator fails to store data
Key: SPARK-4707
URL: https://issues.apache.org/jira/browse/SPARK-4707
Project: Spark
Issue Type: Bug
Components: Streaming
Affects Versions: 1.2.0
Reporter: Hari Shreedharan
The Reliable Kafka Receiver commits offsets only when events are actually
stored, which ensures that on restart we will actually start where we left off.
But if the failure happens in the store() call, and the block generator reports
an error the receiver does not do anything and will continue reading from the
current offset and not the last commit. This means that messages between the
last commit and the current offset will be lost.
I will send a PR for this soon - I have a patch which needs some minor fixes,
which I need to test.
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