[jira] [Created] (HADOOP-18979) Create curator client the same way possibly with the same code for all services

["István Fajth (Jira)" <ji...@apache.org>]

István Fajth created HADOOP-18979:
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             Summary: Create curator client the same way possibly with the same code for all services
                 Key: HADOOP-18979
                 URL: https://issues.apache.org/jira/browse/HADOOP-18979
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: István Fajth


Currently ZKSignerSecretProvider and ZKDelegationTokenSecretManager classes are using the same ZookeeperClient class to create their respective Zookeeper connection via a Curator client.
In order to have a standardized way of creating Zookeeper connections, we have two areas to fix:
- YARN and its Curator instantiation
- HDFS ZKFC, which currently uses a Zookeeper client directly, so it should also be migrated to Curator if we want to utilize the common instantiation.

The problem that we would solve is that currently we have 3 places where we create ZK connections, and all of them has its own things, along with some duplications.
We also have the HadoopZookeeperFactory, that I think we do not need. The only thing that is different for this is how we set up SASL permission provider for the connection. I believe that can also be unified, with that the whole Zookeeper connection creation can be pushed down to the recently added code that handles this for ZKDelegationTokenSecretManager and ZKSignerSecretProvider.



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