Stanislav Kozlovski created KAFKA-8036:
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Summary: Log dir reassignment on followers fails with
FileNotFoundException for the leader epoch cache on leader election
Key: KAFKA-8036
URL: https://issues.apache.org/jira/browse/KAFKA-8036
Project: Kafka
Issue Type: Improvement
Affects Versions: 2.0.1, 1.1.0, 1.0.2
Reporter: Stanislav Kozlovski
Assignee: Stanislav Kozlovski
When changing a partition's log directories for a follower broker, we move all
the data related to that partition to the other log dir (as per
[KIP-113|https://cwiki.apache.org/confluence/display/KAFKA/KIP-113:+Support+replicas+movement+between+log+directories]).
On a successful move, we rename the original directory by adding a suffix
consisting of an UUID and `-delete`. (e.g `test_log_dir` would be renamed to
`test_log_dir-0.32e77c96939140f9a56a49b75ad8ec8d-delete`)
We copy every log file and [initialize a new leader epoch file
cache|[https://github.com/apache/kafka/blob/0d56f1413557adabc736cae2dffcdc56a620403e/core/src/main/scala/kafka/log/Log.scala#L768].]
The problem is that we do not update the associated `Replica` class' leader
epoch cache - it still points to the old `LeaderEpochFileCache` instance.
This results in a FileNotFound exception when the broker is [elected as a
leader for the
partition|[https://github.com/apache/kafka/blob/255f4a6effdc71c273691859cd26c4138acad778/core/src/main/scala/kafka/cluster/Partition.scala#L312].]
This has the unintended side effect of marking the log directory as offline,
resulting in all partitions from that log directory becoming unavailable for
the specific broker.
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