[jira] [Commented] (SOLR-11685) CollectionsAPIDistributedZkTest.testCollectionsAPI fails regularly with leader mismatch

["Varun Thacker (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-11685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16283148#comment-16283148 ] 

Varun Thacker commented on SOLR-11685:
--------------------------------------

{code}
    if ((isLeader && !localIsLeader) || (isSubShardLeader && !localIsLeader)) {
      log.error("ClusterState says we are the leader, but locally we don't think so");
+      if (from == null) {
+        //if leader=null means the client sent the request. If we aren't the leader (the client has old info) return a exception which the client can +retry on
+      }
      throw new SolrException(ErrorCode.SERVICE_UNAVAILABLE,
          "ClusterState says we are the leader (" + zkController.getBaseUrl()
              + "/" + req.getCore().getName() + "), but locally we don't think so. Request came from " + from);
    }
{code}

> CollectionsAPIDistributedZkTest.testCollectionsAPI fails regularly with leader mismatch
> ---------------------------------------------------------------------------------------
>
>                 Key: SOLR-11685
>                 URL: https://issues.apache.org/jira/browse/SOLR-11685
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Varun Thacker
>         Attachments: jenkins_7x_257.log, jenkins_master_7045.log
>
>
> I've been noticing lots of failures on Jenkins where the document add get's rejected because of leader conflict and throws an error like 
> {code}
> ClusterState says we are the leader (https://127.0.0.1:38715/solr/awhollynewcollection_0_shard2_replica_n2), but locally we don't think so. Request came from null
> {code}
> Scanning Jenkins logs I see that these failures have increased since Sept 28th and has been failing daily.



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