[jira] [Created] (KAFKA-3766) Unhandled "not enough replicas" errors in SyncGroup

["Jason Gustafson (JIRA)" <ji...@apache.org>]

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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