GitHub user enixon reopened a pull request:
https://github.com/apache/zookeeper/pull/628
ZOOKEEPER-3140: Allow Followers to host Observers
Creates a new abstraction, LearnerMaster, to represent the portions of the
Leader logic that are used in LearnerHandler. Leader implements LearnerMaster
and a new class ObserverMaster implements LearnerMaster. Followers have the
option of instantiating a ObserverMaster thread when they assume their role and
so support Learner traffic.
A new parameter 'observerMasterPort' is used to control which Follower
instances host Observers.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/enixon/zookeeper learner-master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zookeeper/pull/628.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 #628
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commit ab5be29541e9968654855115f654207c04e8f9f6
Author: Brian Nixon <nixon@...>
Date: 2018-09-12T21:07:22Z
ZOOKEEPER-3140: Allow Followers to host Observers
commit 1f915d4e1b9b7d4eab67c0117bc668018ab0e791
Author: Brian Nixon <nixon@...>
Date: 2018-09-15T00:12:40Z
address the findbugs nits
commit 0e522c9e572d6ef0732cee5defe84a614598442c
Author: Brian Nixon <nixon@...>
Date: 2018-09-27T01:11:22Z
add comments and address style nits
commit a9cc50fef0921e5b3b390eface3c0401c3fb67dc
Author: Brian Nixon <nixon@...>
Date: 2018-09-27T22:41:39Z
fix flaky test ObserverMasterTest::testAdminCommands
commit 3f453143d900624841d4d3ba1cd3e8a8ca227ab5
Author: Brian Nixon <nixon@...>
Date: 2018-10-09T22:54:17Z
address Michael's initial feedback
todo
- add documentation to
zookeeper-docs/src/documentation/content/xdocs/zookeeperObservers.xml to match
https://jira.apache.org/jira/browse/ZOOKEEPER-3140 description
- rework method docs in Learner to reflect that Followers still connect to
the Leader (not to generic LearnerMaster's)
commit 534eba61c79e933f0fdc54961ffb33dac8d5da0b
Author: Brian Nixon <nixon@...>
Date: 2018-10-10T00:55:07Z
fix 50% failure rate of ObserverMasterTest::testAdminCommands
commit 332ade54b4f314b6e9084b4781da9015f1d8a13f
Author: Brian Nixon <nixon@...>
Date: 2018-10-22T23:45:33Z
add expanded documentation to zookeeperObservers.xml and Learner.java
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