Jeff Kim created KAFKA-13007:
--------------------------------
Summary: KafkaAdminClient getListOffsetsCalls builds cluster
snapshot for every topic partition
Key: KAFKA-13007
URL: https://issues.apache.org/jira/browse/KAFKA-13007
Project: Kafka
Issue Type: Bug
Components: clients
Affects Versions: 2.8.0
Reporter: Jeff Kim
Assignee: Jeff Kim
>From KafkaAdminClient#getListOffsetsCalls:
```
for (Map.Entry<TopicPartition, OffsetSpec> entry:
topicPartitionOffsets.entrySet()) {
...
Node node = mr.cluster().leaderFor(tp);
```
here we build the cluster snapshot for each topic partition. instead, we should
reuse a snapshot. this will reduce the time complexity from O(n^2) to O(n).
for manual testing (used AK 2.8), i've passed in a map of 6K topic partitions
to listOffsets
without snapshot reuse:
duration of building futures from metadata response: 15582 milliseconds
total duration of listOffsets: 15743 milliseconds
with reuse:
duration of building futures from metadata response: 24 milliseconds
total duration of listOffsets: 235 milliseconds
Affects all versions since Admin & KafkaAdminClient introduced listOffsets
(original PR:
https://github.com/apache/kafka/pull/7296/files#diff-5422d10d9a7f4776c6538ae3aea27f24e94cf4ecf5e752040125aca6edc795d3R3673)
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