kafka-2164; ReplicaFetcherThread: suspicious log message on reset offset; patched by Alexey Ozeritski; reviewed by Jun Rao

core/src/main/scala/kafka/server/ReplicaFetcherThread.scala

@@ -111,9 +111,9 @@ class ReplicaFetcherThread(name:String,
        * Roll out a new log at the follower with the start offset equal to the current leader's start offset and continue fetching.
        */
       val leaderStartOffset = simpleConsumer.earliestOrLatestOffset(topicAndPartition, OffsetRequest.EarliestTime, brokerConfig.brokerId)
-      replicaMgr.logManager.truncateFullyAndStartAt(topicAndPartition, leaderStartOffset)
       warn("Replica %d for partition %s reset its fetch offset from %d to current leader %d's start offset %d"
         .format(brokerConfig.brokerId, topicAndPartition, replica.logEndOffset.messageOffset, sourceBroker.id, leaderStartOffset))
+      replicaMgr.logManager.truncateFullyAndStartAt(topicAndPartition, leaderStartOffset)
       leaderStartOffset
     }
   }