Michael Han created ZOOKEEPER-2819:
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Summary: Rolling restarts does not work on 3.5.x.
Key: ZOOKEEPER-2819
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2819
Project: ZooKeeper
Issue Type: Bug
Components: quorum, server
Affects Versions: 3.5.3, 3.5.2, 3.5.1, 3.5.0
Reporter: Michael Han
Priority: Critical
In 3.5.x there is no easy way of doing the rolling restarts because of the
introduction of dynamic reconfig feature in ZOOKEEPER-107, which prevents
direct manual editing of zoo.cfg file.
ZOOKEEPER-2014 introduced a reconfigEnabled flag to turn on / off the reconfig
feature. We can use same flag and when it sets to false, it should disable both
in memory and on disk updates for config files, besides disabling the reconfig
commands on CLI which ZOOKEEPER-2014 already did, so users can continue using
rolling restarts if needed.
We should also document explicitly the support of rolling restarts will be
deprecated at what release time frame and promote reconfig as the replacement.
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