Jason Gustafson created KAFKA-3766:
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Summary: Unhandled "not enough replicas" errors in SyncGroup
Key: KAFKA-3766
URL: https://issues.apache.org/jira/browse/KAFKA-3766
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Caught by [~ijuma]. We seem to be missing at least a couple error codes when
handling the append log response when writing group metadata to the offsets
topic in the SyncGroup handler. In particular, we are missing checks for
NOT_ENOUGH_REPLICAS and NOT_ENOUGH_REPLICAS_AFTER_APPEND. Currently these
errors are returned directly in the SyncGroup response and cause an exception
to be raised to the user.
There are two options to fix this problem:
1. We can continue to return these error codes in the sync group response and
add a handler on the client side to retry.
2. We can convert the errors on the server to something like
COORDINATOR_NOT_AVAILABLE, which will cause the client to retry with the
existing logic.
The second option seems a little nicer to avoid exposing the internal
implementation of the SyncGroup request (i.e. that we write group metadata to a
partition). It also has the nice side effect of fixing old clients
automatically when the server is upgraded.
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