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ASF subversion and git services commented on SOLR-10130: -------------------------------------------------------- Commit a9eb001f44ca846b64d4ed6e46af316fe12ce3d0 in lucene-solr's branch refs/heads/branch_6_4 from [~ab] [ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=a9eb001 ] SOLR-10130 Serious performance degradation in Solr 6.4.1 due to the new metrics collection. > Serious performance degradation in Solr 6.4.1 due to the new metrics > collection > ------------------------------------------------------------------------------- > > Key: SOLR-10130 > URL: https://issues.apache.org/jira/browse/SOLR-10130 > Project: Solr > Issue Type: Bug > Security Level: Public(Default Security Level. Issues are Public) > Components: metrics > Affects Versions: 6.4.1 > Environment: Centos 7, OpenJDK 1.8.0 update 111 > Reporter: Ere Maijala > Assignee: Andrzej Bialecki > Priority: Blocker > Labels: perfomance > Fix For: master (7.0), 6.4.2 > > Attachments: SOLR-10130.patch, SOLR-10130.patch, > solr-8983-console-f1.log > > > We've stumbled on serious performance issues after upgrading to Solr 6.4.1. > Looks like the new metrics collection system in MetricsDirectoryFactory is > causing a major slowdown. This happens with an index configuration that, as > far as I can see, has no metrics specific configuration and uses > luceneMatchVersion 5.5.0. In practice a moderate load will completely bog > down the server with Solr threads constantly using up all CPU (600% on 6 core > machine) capacity with a load that normally where we normally see an average > load of < 50%. > I took stack traces (I'll attach them) and noticed that the threads are > spending time in com.codahale.metrics.Meter.mark. I tested building Solr > 6.4.1 with the metrics collection disabled in MetricsDirectoryFactory getByte > and getBytes methods and was unable to reproduce the issue. > As far as I can see there are several issues: > 1. Collecting metrics on every single byte read is slow. > 2. Having it enabled by default is not a good idea. > 3. The comment "enable coarse-grained metrics by default" at > https://github.com/apache/lucene-solr/blob/branch_6x/solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java#L104 > implies that only coarse-grained metrics should be enabled by default, and > this contradicts with collecting metrics on every single byte read. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org