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https://issues.apache.org/jira/browse/TS-4485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15302918#comment-15302918
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ASF subversion and git services commented on TS-4485:
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Commit d1f56335ca5170e9b4228e2441d7d4328c2bdec4 in trafficserver's branch
refs/heads/master from [~jacksontj]
[ https://git-wip-us.apache.org/repos/asf?p=trafficserver.git;h=d1f5633 ]
Merge pull request #670 from jacksontj/TS-4485
TS-4485 schedule HostDBSyncer in ET_TASK threads instead of ET_NET threads
> 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
>
> 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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