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Posted to hdfs-issues@hadoop.apache.org by "ZanderXu (Jira)" <ji...@apache.org> on 2022/12/23 06:19:00 UTC
[jira] [Resolved] (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 ]
ZanderXu resolved HDFS-16831.
-----------------------------
Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
> [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
> 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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