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  1. Hadoop HDFS
  2. HDFS-16831

[RBF SBN] GetNamenodesForNameserviceId should shuffle Observer NameNodes every time

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    • Reviewed

    Description

      The method getNamenodesForNameserviceId in MembershipNamenodeResolver.class should shuffle Observer NameNodes every time. The current logic will return the cached list and will caused all of read requests are forwarding to the first observer namenode. 

       

      The related code as bellow:

      @Override
public List<? extends FederationNamenodeContext> getNamenodesForNameserviceId(
    final String nsId, boolean listObserversFirst) throws IOException {

  List<? extends FederationNamenodeContext> ret = cacheNS.get(Pair.of(nsId, listObserversFirst));
  if (ret != null) {
    return ret;
  } 
  ...
}

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          is caused by

          Sub-task - The sub-task of the issue HDFS-13522 HDFS-13522: Add federated nameservices states to client protocol and propagate it between routers and clients.

          • Major - Major loss of function.
          • Resolved
          relates to

          Sub-task - The sub-task of the issue HDFS-13522 HDFS-13522: Add federated nameservices states to client protocol and propagate it between routers and clients.

          • Major - Major loss of function.
          • Resolved
          links to

          Web Link GitHub Pull Request #5098

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              xuzq_zander ZanderXu
              xuzq_zander ZanderXu
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                Updated:
                Resolved: