* HDFS-15383. RBF: Add support for router delegation token without watch (#2047)
Improving router's performance for delegation tokens related operations. It achieves the goal by removing watchers from router on tokens since based on our experience. The huge number of watches inside Zookeeper is degrading Zookeeper's performance pretty hard. The current limit is about 1.2-1.5 million.
* HADOOP-17835. Use CuratorCache implementation instead of PathChildrenCache / TreeCache (#3266)
Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
Co-authored-by: lfengnan <lfengnan@uber.com>
Co-authored-by: Viraj Jasani <vjasani@apache.org>
Co-authored-by: Melissa You <myou@myou-mn1.linkedin.biz>
* HADOOP-16579 - Upgrade to Apache Curator 4.2.0 and ZooKeeper 3.5.5
- Add 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, so to keep the ZooKeeper 3.4.x behavior
we enabled it for the tests)
- Also fix ZKFailoverController to look for relevant fail-over ActiveAttempt
records. The new ZooKeeper seems to respond quicker during the fail-over
tests than the ZooKeeper, so we made sure to catch all the relevant records
by adding a new parameter to ZKFailoverontroller.waitForActiveAttempt().
Co-authored-by: Norbert Kalmár <nkalmar@cloudera.com>
