[jira] [Created] (HDDS-8867) Datanode re-registration memory leak

["Attila Doroszlai (Jira)" <ji...@apache.org>]

Attila Doroszlai created HDDS-8867:
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             Summary: Datanode re-registration memory leak
                 Key: HDDS-8867
                 URL: https://issues.apache.org/jira/browse/HDDS-8867
             Project: Apache Ozone
          Issue Type: Bug
          Components: SCM
            Reporter: Attila Doroszlai
            Assignee: Attila Doroszlai


SCM does not properly remove datanode address to UUID mapping for the old address when datanode re-registers with different address.  It tries to remove {{dnsName}} (address) from the set of UUIDs:

{code:title=https://github.com/apache/ozone/blob/3846cd249d10a6f7d937853be0f97c848d9ea6a6/hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/SCMNodeManager.java#L481-L492}
  private synchronized void removeEntryFromDnsToUuidMap(String dnsName) {
    if (!dnsToUuidMap.containsKey(dnsName)) {
      return;
    }
    Set<String> dnSet = dnsToUuidMap.get(dnsName);
    if (dnSet.contains(dnsName)) {
      dnSet.remove(dnsName);
    }
    if (dnSet.isEmpty()) {
      dnsToUuidMap.remove(dnsName);
    }
  }
{code}



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