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Scott Blum commented on SOLR-8914: ---------------------------------- Correct, the refreshCollectionListLock solves the same class of bug for the collections list as we needed to solve for live_nodes. However, the implementation is simpler since we don't need to hold getUpdateLock() and therefore there's no deadlock potential. The code to check this.legacyClusterStateVersion >= stat.getVersion() solves that class of bug for clusterstate.json; we already have version guarding code for stateformat 2 collections, it was an oversight not to have it for this also. Net-net: my intent (hope?) is this patch should fix this category of race condition for all the major pieces of ZkStateReader. > ZkStateReader's refreshLiveNodes(Watcher) is not thread safe > ------------------------------------------------------------ > > Key: SOLR-8914 > URL: https://issues.apache.org/jira/browse/SOLR-8914 > Project: Solr > Issue Type: Bug > Reporter: Hoss Man > Attachments: SOLR-8914.patch, SOLR-8914.patch, SOLR-8914.patch, > SOLR-8914.patch, jenkins.thetaphi.de_Lucene-Solr-6.x-Solaris_32.log.txt, > live_node_mentions_port56361_with_threadIds.log.txt, > live_nodes_mentions.log.txt > > > Jenkin's encountered a failure in TestTolerantUpdateProcessorCloud over the > weekend.... > {noformat} > http://jenkins.thetaphi.de/job/Lucene-Solr-6.x-Solaris/32/consoleText > Checking out Revision c46d7686643e7503304cb35dfe546bce9c6684e7 > (refs/remotes/origin/branch_6x) > Using Java: 64bit/jdk1.8.0 -XX:+UseCompressedOops -XX:+UseG1GC > {noformat} > The failure happened during the static setup of the test, when a > MiniSolrCloudCluster & several clients are initialized -- before any code > related to TolerantUpdateProcessor is ever used. > I can't reproduce this, or really make sense of what i'm (not) seeing here in > the logs, so i'm filing this jira with my analysis in the hopes that someone > else can help make sense of it. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org