[HDFS-9039] Separate client and server side methods of o.a.h.hdfs.NameNodeProxies

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Mingliang Liu
• Reporter: Mingliang Liu
• Created: 08/Sep/15 23:10
• Updated: 30/Aug/16 01:27
• Resolved: 23/Sep/15 03:55

Description

Currently the org.apache.hadoop.hdfs.NameNodeProxies class is used by both org.apache.hadoop.hdfs.server package (for server side protocols) and DFSClient class (for ClientProtocol). The DFSClient class should be moved to hadoop-hdfs-client module (see HDFS-8053 ). As the org.apache.hadoop.hdfs.NameNodeProxies class also depends on server side protocols (e.g. JournalProtocol and NamenodeProtocol), we can't simply move this class to the hadoo-hdfs-client module as well.

This jira tracks the effort of moving ClientProtocol related static methods in org.apache.hadoop.hdfs.NameNodeProxies class to hadoo-hdfs-client module. A good place to put these static methods is a new class named NameNodeProxiesClient.

The checkstyle warnings can be addressed in HDFS-8979, and removing the slf4j logger guards when calling LOG.debug() and LOG.trace() can be addressed in HDFS-8971.

Issue Links

• blocks: HDFS-8053 Move DFSIn/OutputStream and related classes to hadoop-hdfs-client
• blocks: HDFS-8740 Move DistributedFileSystem to hadoop-hdfs-client
• is blocked by: HDFS-9022 Move NameNode.getAddress() and NameNode.getUri() to hadoop-hdfs-client
• is blocked by: HDFS-9111 Move hdfs-client protobuf convert methods from PBHelper to PBHelperClient