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ASF subversion and git services commented on SOLR-8973: ------------------------------------------------------- Commit b663e5bcad9974f2d80c16b85c862407a38290e0 in lucene-solr's branch refs/heads/branch_6_0 from [~dragonsinth] [ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=b663e5b ] SOLR-8973: Zookeeper frenzy when a core is first created. For branch_6_0: Modified ZkStateReaderTest to use ZkStateReader.updateClusterState() instead of .forceUpdateCollection(), since SOLR-8745 will land in 6.1. > TX-frenzy on Zookeeper when collection is put to use > ---------------------------------------------------- > > Key: SOLR-8973 > URL: https://issues.apache.org/jira/browse/SOLR-8973 > Project: Solr > Issue Type: Bug > Components: SolrCloud > Affects Versions: 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 6.0 > Reporter: Janmejay Singh > Assignee: Scott Blum > Labels: collections, patch-available, solrcloud, zookeeper > Fix For: 5.5.1, 5.6, 6.0.1, 6.1, master (7.0) > > Attachments: SOLR-8973-ZkStateReader.patch, SOLR-8973.patch, > SOLR-8973.patch, SOLR-8973.patch > > > This is to do with a distributed data-race. Core-creation happens at a time > when collection is not yet visible to the node. In this case a fallback > code-path is used which de-references collection-state lazily (on demand) as > opposed to setting a watch and keeping it cached locally. > Due to this, as requests towards the core mount, it generates ZK fetch for > collection proportionately. On a large solr-cloud cluster, this generates > several Gbps of TX traffic on ZK nodes. This affects indexing > throughput(which floors) in addition to running ZK node out of network > bandwidth. > On smaller solr-cloud clusters its hard to run into, because probability of > this race materializing reduces. -- 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