[HDFS-13099] RBF: Use the ZooKeeper as the default State Store

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.1.0, 2.10.0, 2.9.1, 3.0.3
• Component/s: documentation
• Labels: incompatible incompatibleChange
• Target Version/s: 3.1.0, 2.9.1
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: Change default State Store from local file to ZooKeeper. This will require additional zk address to be configured.
• Assignee: Yiqun Lin
• Reporter: Yiqun Lin
• Created: 01/Feb/18 10:03
• Updated: 05/Apr/18 20:03
• Resolved: 09/Feb/18 06:06

Description

Currently the State Store Driver relevant settings only written in its implement classes.

public class StateStoreZooKeeperImpl extends StateStoreSerializableImpl {
...

  /** Configuration keys. */
  public static final String FEDERATION_STORE_ZK_DRIVER_PREFIX =
      DFSConfigKeys.FEDERATION_STORE_PREFIX + "driver.zk.";
  public static final String FEDERATION_STORE_ZK_PARENT_PATH =
      FEDERATION_STORE_ZK_DRIVER_PREFIX + "parent-path";
  public static final String FEDERATION_STORE_ZK_PARENT_PATH_DEFAULT =
      "/hdfs-federation";
..

Actually, they should be moved into class DFSConfigKeys and documented in file hdfs-default.xml. This will help more users know these settings and know how to use.