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Posted to issues@trafficserver.apache.org by "Alan M. Carroll (JIRA)" <ji...@apache.org> on 2010/10/09 18:45:30 UTC
[jira] Created: (TS-480) Unresponsive server can stall ATS
Unresponsive server can stall ATS
---------------------------------
Key: TS-480
URL: https://issues.apache.org/jira/browse/TS-480
Project: Traffic Server
Issue Type: Bug
Components: HTTP
Affects Versions: 2.1.3, 2.1.4, 2.1.2, 2.1.1
Reporter: Alan M. Carroll
If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Commented: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919512#action_12919512 ]
Alan M. Carroll commented on TS-480:
------------------------------------
During out testing we have been having problems with ATS stalling out, then recovering when doing multiple simultaneous clients. I think the problem is caused by the default for NetVCOptions::f_blocking_connect being set to true. When I did that fix initially it wasn't clear to me what the correct default was (as evidenced by the comments for NetVCOptions in I_NetVConnection.h state the default as "false").
As a fix, I propose to
1) Change the default to "false" (that is, connect() does not block).
2) Explicit set the opt.f_blocking_connect to false in HttpSM::do_http_server_open.
I am currently testing this fix locally.
My concern is possible side effects from changing the default. I am still not sufficiently familiar with the connection logic to be confident of this change. Note that for this specific issue, (2) should suffice but I now think that overall the expectation of other code is for the default to be non-blocking.
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2, 2.1.1
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Updated: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll updated TS-480:
-------------------------------
Attachment: ts480-patch.txt
Patch as described.
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2, 2.1.1
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Attachments: ts480-patch.txt
>
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Updated: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll updated TS-480:
-------------------------------
Attachment: (was: ts480-patch.txt)
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2, 2.1.1
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Attachments: ts480-patch.txt
>
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Updated: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll updated TS-480:
-------------------------------
Comment: was deleted
(was: Patch as described in comment)
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Attachments: ts480-patch.txt
>
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Updated: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll updated TS-480:
-------------------------------
Affects Version/s: (was: 2.1.1)
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Attachments: ts480-patch.txt
>
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Updated: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll updated TS-480:
-------------------------------
Comment: was deleted
(was: Patch as described.)
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Attachments: ts480-patch.txt
>
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Updated: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll updated TS-480:
-------------------------------
Comment: was deleted
(was: Where this problem was created.)
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Fix For: 2.1.4
>
> Attachments: ts480-patch.txt
>
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Updated: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll updated TS-480:
-------------------------------
Attachment: ts480-patch.txt
Patch as described in comment
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2, 2.1.1
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
> Attachments: ts480-patch.txt
>
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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[jira] Assigned: (TS-480) Unresponsive server can stall ATS
Posted by "Alan M. Carroll (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TS-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan M. Carroll reassigned TS-480:
----------------------------------
Assignee: Alan M. Carroll
> Unresponsive server can stall ATS
> ---------------------------------
>
> Key: TS-480
> URL: https://issues.apache.org/jira/browse/TS-480
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 2.1.4, 2.1.3, 2.1.2, 2.1.1
> Reporter: Alan M. Carroll
> Assignee: Alan M. Carroll
>
> If a cache fill request from ATS to an origin stalls, this can block all other HTTP connections outbound from ATS. ATS appears to be unresponsive until the stalled request fails, at which point ATS resumes operation.
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