Neha Narkhede created KAFKA-1021:
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Summary: Write a tool to check replica lag for individual topic
partitions
Key: KAFKA-1021
URL: https://issues.apache.org/jira/browse/KAFKA-1021
Project: Kafka
Issue Type: Improvement
Components: tools
Affects Versions: 0.8
Reporter: Neha Narkhede
Assignee: Neha Narkhede
For highest consistency guarantees, we require all replicas to be in-sync with
the leader. This increases the possibility of picking an in-sync replica as the
next leader, during leader election. However, due to network/disk/CPU
bottleneck, replicas may fall out of ISR. One of the first things to check is
if the replica is making progress and how many messages behind it has fallen.
We need a simple tool that can take in one or more topics/partitions and find
the lag of the replicas. This tool is similar in usage to the
ConsumerOffsetChecker, but work differently since we do not checkpoint replica
offsets in zookeeper.
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