[jira] [Created] (HADOOP-17729) Datanode client is stuck, waiting for connections map to be empty

["Kiran Kumar Maturi (Jira)" <ji...@apache.org>]

Kiran Kumar Maturi created HADOOP-17729:
-------------------------------------------

             Summary: Datanode client is stuck, waiting for connections map to be empty
                 Key: HADOOP-17729
                 URL: https://issues.apache.org/jira/browse/HADOOP-17729
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 2.10.1
            Reporter: Kiran Kumar Maturi


In our cluster we have observed when close command is issued to Datanode, It is stuck indefinitely waiting for connections map to be empty.

{code:java}
for (Connection conn : connections.values()) {
      conn.interrupt();
      conn.interruptConnectingThread();
    }
    
    // wait until all connections are closed
    while (!connections.isEmpty()) {
      try {
        Thread.sleep(STOP_SLEEP_TIME_MS);
      } catch (InterruptedException e) {
      }
    }
{code}

[code link|https://github.com/apache/hadoop/blob/branch-2.10.1/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java#L1360]




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