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https://issues.apache.org/jira/browse/SOLR-14504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17176291#comment-17176291
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Colvin Cowie commented on SOLR-14504:
-------------------------------------
[~ab] this did make it into 8.6 right? But it's not been closed/
> ZkController LiveNodesListener has NullPointerException in startup race
> -----------------------------------------------------------------------
>
> Key: SOLR-14504
> URL: https://issues.apache.org/jira/browse/SOLR-14504
> Project: Solr
> Issue Type: Bug
> Affects Versions: 7.7, 7.7.1, 7.7.2, 8.0, 8.1, 8.2, 7.7.3, 8.1.1, 8.3,
> 8.4, 8.3.1, 8.5, 8.4.1, 8.5.1
> Reporter: Colvin Cowie
> Priority: Minor
> Attachments: SOLR-14504.patch
>
>
> If a NODELOST event happens before the cloudManager is initialized then a
> NullPointerException will occur on this line
> [https://github.com/apache/lucene-solr/blob/c18666ad05afc02979c150aacd4810cff02e43f3/solr/core/src/java/org/apache/solr/cloud/ZkController.java#L1020]
> {code:java}
> byte[] json = Utils.toJSON(Collections.singletonMap("timestamp",
> cloudManager.getTimeSource().getEpochTimeNs())); {code}
> Rather than accessing cloudManager directly, getSolrCloudManager() should be
> called.
>
> This happens very rarely, but if it happens it will stop Solr starting,
> result in "CoreContainer is either not initialized or shutting down". Snippet
> from 8.3.1
> {noformat}
> 2020-05-19 03:44:40.241 INFO (main) [ ] o.a.s.c.c.ConnectionManager
> Waiting for client to connect to ZooKeeper
> 2020-05-19 03:44:40.245 INFO (zkConnectionManagerCallback-11-thread-1) [ ]
> o.a.s.c.c.ConnectionManager zkClient has connected
> 2020-05-19 03:44:40.245 INFO (main) [ ] o.a.s.c.c.ConnectionManager Client
> is connected to ZooKeeper
> 2020-05-19 03:44:40.359 INFO (main) [ ] o.a.s.c.c.ConnectionManager
> Waiting for client to connect to ZooKeeper
> 2020-05-19 03:44:40.361 INFO (zkConnectionManagerCallback-13-thread-1) [ ]
> o.a.s.c.c.ConnectionManager zkClient has connected
> 2020-05-19 03:44:40.361 INFO (main) [ ] o.a.s.c.c.ConnectionManager Client
> is connected to ZooKeeper
> 2020-05-19 03:44:40.417 INFO (main) [ ] o.a.s.c.c.ZkStateReader Updated
> live nodes from ZooKeeper... (0) -> (1)
> 2020-05-19
> 03:44:56.606 INFO (zkCallback-12-thread-2) [ ]
> o.a.s.c.c.ZkStateReader Updated live nodes from ZooKeeper... (1) ->
> (0)
> 2020-05-19 03:44:56.614 ERROR (main) [ ]
> o.a.s.s.SolrDispatchFilter Could not start Solr. Check solr/home
> property and the logs
> 2020-05-19 03:44:56.639 ERROR (main) [ ] o.a.s.c.SolrCore
> null:java.lang.NullPointerException
> at
> org.apache.solr.cloud.ZkController.lambda$registerLiveNodesListener$10(ZkController.java:1020)
> at
> org.apache.solr.common.cloud.ZkStateReader.registerLiveNodesListener(ZkStateReader.java:880)
> at
> org.apache.solr.cloud.ZkController.registerLiveNodesListener(ZkController.java:1035)
> at org.apache.solr.cloud.ZkController.init(ZkController.java:917)
> at org.apache.solr.cloud.ZkController.<init>(ZkController.java:473)
> at org.apache.solr.core.ZkContainer.initZooKeeper(ZkContainer.java:115)
> at
> org.apache.solr.core.CoreContainer.load(CoreContainer.java:631){noformat}
>
>
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