Joel Koshy created KAFKA-1355:
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Summary: Reduce/optimize update metadata requests sent during
leader election
Key: KAFKA-1355
URL: https://issues.apache.org/jira/browse/KAFKA-1355
Project: Kafka
Issue Type: Bug
Affects Versions: 0.8.1
Reporter: Joel Koshy
Priority: Critical
Fix For: 0.8.1.1
This is part of the investigation into slow shutdowns in 0.8.1. While
logging contributes to bulk of the regression, this one also adds
quite a bit of overhead:
In addLeaderAndIsrRequest (called for every partition that is led by the
broker being shut down) we also add an UpdateMetadataRequest - each call to
addUpdateMetadataRequests does two traversals over _all_ (global)
partitions. I think it should be straightforward to optimize this a bit.
Marking as critical, since it is not as big an overhead as the logging.
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