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Posted to hdfs-issues@hadoop.apache.org by "Shilun Fan (Jira)" <ji...@apache.org> on 2024/01/28 07:56:00 UTC
[jira] [Updated] (HDFS-16831) [RBF SBN] GetNamenodesForNameserviceId should shuffle Observer NameNodes every time
[ https://issues.apache.org/jira/browse/HDFS-16831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shilun Fan updated HDFS-16831:
------------------------------
Affects Version/s: 3.4.0
> [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
> Components: namanode, rbf
> Affects Versions: 3.4.0
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> 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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