[jira] [Issue Comment Deleted] (SOLR-7319) Workaround the Four Month Bug causing GC pause problems
[ https://issues.apache.org/jira/browse/SOLR-7319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Shawn Heisey updated SOLR-7319: --- Comment: was deleted (was: Patch implementing the workaround, and documenting the fact that tools like jstat will no longer function.) 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 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
[jira] [Issue Comment Deleted] (SOLR-7319) Workaround the Four Month Bug causing GC pause problems
[ https://issues.apache.org/jira/browse/SOLR-7319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Shawn Heisey updated SOLR-7319: --- Comment: was deleted (was: The situation where the bug presents itself -- heavy writes via mmap -- is exactly what Solr (Lucene) does when indexing or merging.) 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 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
[jira] [Issue Comment Deleted] (SOLR-7319) Workaround the Four Month Bug causing GC pause problems
[ https://issues.apache.org/jira/browse/SOLR-7319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Otis Gospodnetic updated SOLR-7319: --- Comment: was deleted (was: bq. tools like jstat will no longer function Sounds problematic, no?) 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
