[GitHub] [hadoop] symat opened a new pull request #1656: HADOOP-16579. Upgrade to Curator 4.2.0 and ZooKeeper 3.5.5

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symat opened a new pull request #1656: HADOOP-16579. Upgrade to Curator 4.2.0 and ZooKeeper 3.5.5
URL: https://github.com/apache/hadoop/pull/1656
 
 
   In this PR we upgraded the Apache Curator to 4.0.2 and Apache ZooKeeper to 3.5.5.
   
   While the new ZooKeeper is backward-compatible with the old one, we encountered a few minor issues still. So far the following changes have been made:
   - I added a static initializer for the unit tests using ZooKeeper to enable the four-letter-words diagnostic telnet commands. This is an interface that become disabled by default due to security concerns. (see https://issues.apache.org/jira/browse/ZOOKEEPER-2693) To keep the ZooKeeper 3.4.x behaviour, we enabled it for the tests. Some tests in Hadoop (or other projects using Hadoop-Common) might actually use this feature e.g. to verify the status of ZooKeeper.
   - I also fixed `ZKFailoverController` to look for relevant fail-over ActiveAttempt records. The new ZooKeeper seems to respond quicker during the fail-over tests than the old ZooKeeper, so we made sure to catch all the relevant records by adding a new parameter to `ZKFailoverontroller.waitForActiveAttempt()`.
   

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