simbadzina opened a new pull request, #5469:
URL: https://github.com/apache/hadoop/pull/5469
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### Description of PR
RBF supports two types of StateStoreDrivers
- StateStoreFileImpl
- StateStoreZooKeeperImpl
This PR mplements a third driver that is backed by MySQL.
- StateStoreZooKeeperImpl requires an additional Zookeeper cluster.
- StateStoreFileImpl can use one of the namenodes in the HDFS cluster, but
that namenode becomes a single point of failure, introducing coupling between
the federated clusters.
[HADOOP-18535](https://issues.apache.org/jira/browse/HADOOP-18535)
implemented a MySQL token store. When tokens are stored in MySQL, using MySQL
for the StateStore as well reduces the number of external dependencies for
routers.
### How was this patch tested?
New tests in TestStateStoreMySQL
### For code changes:
- [X ] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [X] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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