Performance issue with Confluence due to Jira Metadata plugin
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*Except Fisheye and Crucible
Problem
When application-linked with Jira, if Jira blocks all traffic, or is placed under high load and/or unresponsive for other reasons such as network conditions, all Confluence HTTP threads can be occupied by Jira metadata aggregation tasks.
This can lead to thread pool saturation and possibly an outage, depending on conditions.
Diagnosis
Environment
Confluence 6.x with application link to Jira
All or most runnable threads will have the following in thread dumps:
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x000000034d5e64e0> (a java.util.concurrent.FutureTask)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
at java.util.concurrent.FutureTask.get(FutureTask.java:191)
at com.atlassian.confluence.plugins.metadata.jira.aggregate.JiraAggregateCacheLoader.getAggregateFromTask(JiraAggregateCacheLoader.java:132)
at com.atlassian.confluence.plugins.metadata.jira.aggregate.JiraAggregateCacheLoader.getValue(JiraAggregateCacheLoader.java:116)
at com.atlassian.confluence.plugins.metadata.jira.aggregate.JiraAggregateCache.getAggregateData(JiraAggregateCache.java:74)
at com.atlassian.confluence.plugins.metadata.jira.service.JiraMetadataService.getAggregateData(JiraMetadataService.java:74)
at com.atlassian.confluence.plugins.metadata.jira.rest.JiraMetadataResource.getAggregateData(JiraMetadataResource.java:33)In particular:
com.atlassian.confluence.plugins.metadata.jira.aggregate.JiraAggregateCacheLoader.getAggregateFromTask(JiraAggregateCacheLoader.java:132)Steps to reproduce issue
- Create an app link between Confluence and Jira
- Block connections from Confluence to Jira e.g. use a firewall to block all traffics to JIRA
- In Confluence, open more than 10 new pages per every 5 seconds (This throughput will make the queue to process Jira metadata aggregation to grow gradually)
Cause
A bug has been created to track this issue and determine root cause CONFSERVER-58526 - Requests to aggregate Jira metadata in Confluence can exhaust HTTP threads and cause outages
Workaround
Disable the "Confluence Jira Metadata" plugin.
The only functionality that will be lost is the "Jira Links" list at the top of the Confluence page if the page contains links to Jira. The actual links within the content of the page will still work.