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ASF GitHub Bot commented on HDFS-16943: --------------------------------------- simbadzina commented on code in PR #5469: URL: https://github.com/apache/hadoop/pull/5469#discussion_r1155038678 ########## hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/driver/StateStoreDriver.java: ########## @@ -35,6 +36,7 @@ * provider. Driver implementations will extend this class and implement some of * the default methods. */ +@InterfaceAudience.Public Review Comment: It is possible to statically import Public, but I think it makes the code less readable having just `@Public` vs `@InterfaceAudience.Public`. The oracle documentation also only recommends static imports when there is frequent access to the value. https://docs.oracle.com/javase/7/docs/technotes/guides/language/static-import.html#:~:text=So%20when%20should%20you%20use,from%20one%20or%20two%20classes. > 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. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org