GitHub user onurkaraman opened a pull request:
https://github.com/apache/kafka/pull/3427
KAFKA-5501 [WIP]: use async zookeeper apis everywhere
Synchronous zookeeper writes means that we wait an entire round trip before
doing the next write. With respect to the controller, these synchronous writes
are happening at a per-partition granularity in several places, so
partition-heavy clusters suffer from the controller doing many sequential round
trips to zookeeper.
- PartitionStateMachine.electLeaderForPartition updates leaderAndIsr in
zookeeper on transition to OnlinePartition. This gets triggered per-partition
sequentially with synchronous writes during controlled shutdown of the shutting
down broker's replicas for which it is the leader.
- ReplicaStateMachine updates leaderAndIsr in zookeeper on transition to
OfflineReplica when calling KafkaController.removeReplicaFromIsr. This gets
triggered per-partition sequentially with synchronous writes for failed or
controlled shutdown brokers.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/onurkaraman/kafka KAFKA-5501
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/3427.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3427
----
commit d118a542c4e08ea1e14fc577f64c746946ac3dea
Author: Onur Karaman <okara...@linkedin.com>
Date: 2017-06-01T20:14:34Z
use async zookeeper apis everywhere
Synchronous zookeeper writes means that we wait an entire round trip before
doing the next write. With respect to the controller, these synchronous writes
are happening at a per-partition granularity in several places, so
partition-heavy clusters suffer from the controller doing many sequential round
trips to zookeeper.
- PartitionStateMachine.electLeaderForPartition updates leaderAndIsr in
zookeeper on transition to OnlinePartition. This gets triggered per-partition
sequentially with synchronous writes during controlled shutdown of the shutting
down broker's replicas for which it is the leader.
- ReplicaStateMachine updates leaderAndIsr in zookeeper on transition to
OfflineReplica when calling KafkaController.removeReplicaFromIsr. This gets
triggered per-partition sequentially with synchronous writes for failed or
controlled shutdown brokers.
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