[jira] [Created] (KAFKA-1154) replicas may not have consistent data after becoming follower

["Jun Rao (JIRA)" <ji...@apache.org>]

Jun Rao created KAFKA-1154:
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             Summary: replicas may not have consistent data after becoming follower
                 Key: KAFKA-1154
                 URL: https://issues.apache.org/jira/browse/KAFKA-1154
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.8.1
            Reporter: Jun Rao
            Assignee: Jun Rao
             Fix For: 0.8.1


This is an issued introduced in KAFKA-1001. The issue is that in ReplicaManager.makeFollowers(), we truncate the log before marking the replica as the follower. New messages from the producer can still be added to the log after the log is truncated, but before the replica is marked as the follower. Those newly produced messages can actually be committed, which implies those truncated messages are also committed. However, the new leader is not guaranteed to have those truncated messages.



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