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Posted to issues@trafficserver.apache.org by "Thomas Jackson (JIRA)" <ji...@apache.org> on 2016/05/26 21:11:12 UTC
[jira] [Assigned] (TS-4485) MultiCache sync causes significant
stalls to various in-flight requests
[ https://issues.apache.org/jira/browse/TS-4485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Jackson reassigned TS-4485:
----------------------------------
Assignee: Thomas Jackson
> MultiCache sync causes significant stalls to various in-flight requests
> -----------------------------------------------------------------------
>
> Key: TS-4485
> URL: https://issues.apache.org/jira/browse/TS-4485
> Project: Traffic Server
> Issue Type: Bug
> Reporter: Thomas Jackson
> Assignee: Thomas Jackson
>
> MultiCache's sync to disk currently schedules the syncer task on the ET_NET thread that is holding the lock for the partition of hostdb. This is a bit unfortunate, as the syncer will actually call `msync` which means its calling a blocking write to disk. I'm seeing this cause some fairly large latency spikes (~100-300ms) on occasion-- even though the disk IO is completely available (since the ET_NET thread gets stalled the entire time, IO that needs to happen is also stalled).
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