[HDFS-15633] Avoid redundant RPC calls for getDiskStatus

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.3.1, 3.4.0, 3.2.3
• Component/s: dfsclient
• Labels: pull-request-available
• Hadoop Flags: Reviewed
• Assignee: Ayush Saxena
• Reporter: Ayush Saxena
• Created: 14/Oct/20 20:03
• Updated: 17/May/21 02:57
• Resolved: 16/Oct/20 05:07

Description

There are 3 RPC calls to fetch the same values :

  public FsStatus getDiskStatus() throws IOException {
    return new FsStatus(getStateByIndex(0),
        getStateByIndex(1), getStateByIndex(2));
  }

getStateByIndex() is called thrice, which is actually a getStats RPC to namenode, The same could have been achieved by just one call

Issue Links

• links to: GitHub Pull Request #2386