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https://issues.apache.org/jira/browse/SOLR-16701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17768189#comment-17768189
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ASF subversion and git services commented on SOLR-16701:
--------------------------------------------------------
Commit f1ba2c2cb8050ad958326141d86e573a28ab0516 in solr's branch
refs/heads/branch_9x from patsonluk
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=f1ba2c2cb80 ]
SOLR-16701: Race condition on PRS enabled collection deletion (#1460)
(cherry picked from commit f22a51cc64f83f7b1268d9f3a4c50e36249bdd87)
> Fetching PRS enabled collection might throw SolrException: Error fetching
> per-replica-states if the collection is deleted during the fetch
> ------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-16701
> URL: https://issues.apache.org/jira/browse/SOLR-16701
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: main (10.0)
> Reporter: Patson Luk
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> It's found that a race condition could arise and trigger SolrException, if:
> 1. `fetchCollectionState` is called, and the state.json is fetched
> 2. But before the `fetchCollectionState` fetches the PRS entries, the
> collection state.json/PRS are deleted by someone else
> 3. `fetchCollectionState` would throw below exception when it reaches the PRS
> fetching logic
> {{org.apache.solr.common.SolrException: Error fetching per-replica states}}
> {{ at
> __randomizedtesting.SeedInfo.seed([C2BFFBF8FE49C1E1:F1C8D9E308D2745]:0)}}
> {{ at
> app//org.apache.solr.common.cloud.PerReplicaStatesFetcher.fetch(PerReplicaStatesFetcher.java:49)}}
> {{ at
> app//org.apache.solr.common.cloud.PerReplicaStatesFetcher$LazyPrsSupplier.lambda$new$0(PerReplicaStatesFetcher.java:62)}}
> {{ at
> app//org.apache.solr.common.cloud.DocCollection$PrsSupplier.get(DocCollection.java:515)}}
> {{ at
> app//org.apache.solr.common.cloud.Replica.isLeader(Replica.java:314)}}
> {{ at app//org.apache.solr.common.cloud.Slice.findLeader(Slice.java:242)}}
> {{ at
> app//org.apache.solr.common.cloud.Slice.setPrsSupplier(Slice.java:56)}}
> {{ at
> app//org.apache.solr.common.cloud.DocCollection.<init>(DocCollection.java:123)}}
> {{ at
> app//org.apache.solr.common.cloud.ClusterState.collectionFromObjects(ClusterState.java:305)}}
> {{ at
> app//org.apache.solr.common.cloud.ClusterState.createFromCollectionMap(ClusterState.java:254)}}
> {{ at
> app//org.apache.solr.client.solrj.impl.ZkClientClusterStateProvider.createFromJsonSupportingLegacyConfigName(ZkClientClusterStateProvider.java:117)}}
> {{ at
> app//org.apache.solr.common.cloud.ZkStateReader.fetchCollectionState(ZkStateReader.java:1695)}}
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