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https://issues.apache.org/jira/browse/HDFS-16943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17707377#comment-17707377
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Simbarashe Dzinamarira commented on HDFS-16943:
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HDFS-13245 got closed with the comment "related functions have been implemented
in YARN-3663.".
However YARN-3663 implements
[SQLFederationStateStore|https://github.com/apache/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/SQLFederationStateStore.java]
whose interface is specify to YARN federation.
> 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
> Labels: pull-request-available
>
> 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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