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https://issues.apache.org/jira/browse/SOLR-17804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18004113#comment-18004113
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ASF subversion and git services commented on SOLR-17804:
--------------------------------------------------------
Commit 623159d3e6c81e4b36f297dc7bd0174518076692 in solr's branch
refs/heads/main from Andrzej Bialecki
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=623159d3e6c ]
SOLR-17804: re-create SolrClient if closed. (#3411)
> CrossDC Consumer tries to reuse an already closed SolrClient
> ------------------------------------------------------------
>
> Key: SOLR-17804
> URL: https://issues.apache.org/jira/browse/SOLR-17804
> Project: Solr
> Issue Type: Bug
> Components: module - crossDC
> Affects Versions: 9.8.1
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.9
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When network is down for a while a CloudSolrClient used by the Consumer
> application becomes unusable because its ZkClientStateProvider gets closed:
> {code:java}
> 272746 ERROR (KafkaCrossDcConsumerWorker) [n: c:ab-test s: r: x: t:]
> o.a.s.c.m.SolrMessageProcessor Unable to connect to solr server. Not
> consuming.
>
> => org.apache.solr.common.AlreadyClosedException
>
>
>
> at
> org.apache.solr.client.solrj.impl.ZkClientClusterStateProvider.getZkStateReader(ZkClientClusterStateProvider.java:222)
>
>
> org.apache.solr.common.AlreadyClosedException: null
>
>
>
> at
> org.apache.solr.client.solrj.impl.ZkClientClusterStateProvider.getZkStateReader(ZkClientClusterStateProvider.java:222)
>
>
> at
> org.apache.solr.client.solrj.impl.ZkClientClusterStateProvider.connect(ZkClientClusterStateProvider.java:217)
>
>
> at
> org.apache.solr.client.solrj.impl.CloudSolrClient.connect(CloudSolrClient.java:364)
>
>
> at
> org.apache.solr.crossdc.messageprocessor.SolrMessageProcessor.connectToSolrIfNeeded(SolrMessageProcessor.java:363)
>
>
> at
> org.apache.solr.crossdc.messageprocessor.SolrMessageProcessor.handleItem(SolrMessageProcessor.java:74)
>
>
> at
> org.apache.solr.crossdc.consumer.KafkaCrossDcConsumer.lambda$sendBatch$2(KafkaCrossDcConsumer.java:375)
>
>
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
>
>
>
> at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
>
>
>
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> [?:?]
>
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> [?:?]
>
>
> at java.lang.Thread.run(Thread.java:829) [?:?] {code}
> The Consumer keeps trying to use this client instance, which results in
> multiple errors and no recovery without restarting the Consumer application.
> The immediate fix is for the Consumer to try to recover from this state by
> re-creating the SolrClient.
> A broader question (to address in another ticket) is what should be the
> proper behavior of CloudSolrClient when its ClusterStateProvider gets closed
> - IMHO the client should be closed too.
>
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