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https://issues.apache.org/jira/browse/SOLR-12047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16382984#comment-16382984
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Cao Manh Dat commented on SOLR-12047:
-------------------------------------
Patch for this ticket, I think it can be committed soon.
> Solr 7.x restart can fail to load some cores
> --------------------------------------------
>
> Key: SOLR-12047
> URL: https://issues.apache.org/jira/browse/SOLR-12047
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.0
> Reporter: Varun Thacker
> Priority: Major
> Attachments: SOLR-12047.patch
>
>
> I've seen this with 2 users running Solr 7.2.1 in the last 2 days where a
> restart fails to load some cores on a node.
>
> Here's the stack trace
>
>
> {noformat}
> date time ERROR
> (coreLoadExecutor-6-thread-2-processing-n:solr-number:8983_solr) [c:name
> s:shard r:core_node130 x:collection_shard_replica] o.a.s.c.ZkController
> org.apache.solr.common.SolrException: coreNodeName core_node130 does not
> exist in shard shard4:
> DocCollection(collection_name//collections/collection_name/state.json/2385)={
> ..collection state.json ...
> }
> at org.apache.solr.cloud.ZkController.checkStateInZk(ZkController.java:1687)
> at org.apache.solr.cloud.ZkController.preRegister(ZkController.java:1590)
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1030)
> ...
> at java.lang.Thread.run(Thread.java:748)
> date time ERROR
> (coreContainerWorkExecutor-2-thread-1-processing-n:solr-number:8983_solr) [ ]
> o.a.s.c.CoreContainer Error waiting for SolrCore to be created
> java.util.concurrent.ExecutionException:
> org.apache.solr.common.SolrException: Unable to create core
> [collection_shardX_replica_n129]
> ...
> at java.lang.Thread.run(Thread.java:748)
> Caused by: org.apache.solr.common.SolrException: Unable to create core
> [collection_shardX_replica_n129]
> ...
> ... 5 more
> Caused by: org.apache.solr.common.SolrException:
> at org.apache.solr.cloud.ZkController.preRegister(ZkController.java:1619)
> at
> org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1030)
> ... 7 more{noformat}
> I created the Jira saying Solr 7.x since it's tied to legacyCloud being set
> to false by default starting Solr 7.0
>
>
> In ZkController#checkStateInZk where the block is only run with
> legacyCloud=false ( L1645 ) we do a waitForState ( L1667 ) and only wait 3
> seconds. If we don't get the desired state the core will fail to load
>
> With big enough clusters this 3 second timeout is too low and we should
> increase it to a large number such that we don't cause core initialization
> failures
> Line reference is from Solr 7.2.1
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