Talk about arcane! Good find! On Fri, Mar 27, 2015 at 9:48 AM, Shawn Heisey (JIRA) <j...@apache.org> wrote: > > [ > https://issues.apache.org/jira/browse/SOLR-7319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel > ] > > Shawn Heisey updated SOLR-7319: > ------------------------------- > Attachment: SOLR-7319.patch > > New patch, this time against trunk, resolving a merge conflict on CHANGES.txt > with another commit. > >> Workaround the "Four Month Bug" causing GC pause problems >> --------------------------------------------------------- >> >> Key: SOLR-7319 >> URL: https://issues.apache.org/jira/browse/SOLR-7319 >> Project: Solr >> Issue Type: Bug >> Components: scripts and tools >> Affects Versions: 5.0 >> Reporter: Shawn Heisey >> Assignee: Shawn Heisey >> Fix For: 5.1 >> >> Attachments: SOLR-7319.patch, SOLR-7319.patch, SOLR-7319.patch >> >> >> A twitter engineer found a bug in the JVM that contributes to GC pause >> problems: >> http://www.evanjones.ca/jvm-mmap-pause.html >> Problem summary (in case the blog post disappears): The JVM calculates >> statistics on things like garbage collection and writes them to a file in >> the temp directory using MMAP. If there is a lot of other MMAP write >> activity, which is precisely how Lucene accomplishes indexing and merging, >> it can result in a GC pause because the mmap write to the temp file is >> delayed. >> We should implement the workaround in the solr start scripts (disable >> creation of the mmap statistics tempfile) and document the impact in >> CHANGES.txt. > > > > -- > 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 >
--------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org
