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https://issues.apache.org/jira/browse/HDFS-16831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629651#comment-17629651
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ASF GitHub Bot commented on HDFS-16831:
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ZanderXu commented on PR #5098:
URL: https://github.com/apache/hadoop/pull/5098#issuecomment-1305225730
> +1 LGTM after last commit. @ZanderXu - Do you think we need to add a UT ?
@ashutoshcipher Sir, thanks for your review. I will add one UT to test it.
Do you have some good ideas to test shuffling result?
> [RBF SBN] GetNamenodesForNameserviceId should shuffle Observer NameNodes
> every time
> -----------------------------------------------------------------------------------
>
> Key: HDFS-16831
> URL: https://issues.apache.org/jira/browse/HDFS-16831
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
>
> 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:
> {code:java}
> @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;
> }
> ...
> }{code}
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