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https://issues.apache.org/jira/browse/HDFS-16943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17698558#comment-17698558
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ASF GitHub Bot commented on HDFS-16943:
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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?
> RBF: Implement MySQL based StateStoreDriver
> -------------------------------------------
>
> Key: HDFS-16943
> URL: https://issues.apache.org/jira/browse/HDFS-16943
> Project: Hadoop HDFS
> Issue Type: Task
> Components: hdfs, rbf
> Reporter: Simbarashe Dzinamarira
> Assignee: Simbarashe Dzinamarira
> Priority: Major
>
> RBF supports two types of StateStoreDrivers
> # StateStoreFileImpl
> # StateStoreZooKeeperImpl
> I propose implementing 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 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.
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