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https://issues.apache.org/jira/browse/TS-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15137085#comment-15137085
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Leif Hedstrom commented on TS-4171:
-----------------------------------
Oh, so this is related to proxy.config.http.cache.allow_empty_doc ? We changed
the default for this to be "1" as of v6.0.0. Did you try if turning this off
fixes the problem?
> a problem of cluster
> --------------------
>
> Key: TS-4171
> URL: https://issues.apache.org/jira/browse/TS-4171
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache, Clustering
> Reporter: hahayaoniming
> Fix For: 6.2.0
>
>
> We found that huge amount of 'slow request' appeared during the application
> of ATS in full-cluster mode:
> the slow request log:
> {noformat}
> [Feb 2 14:30:15.336] Server {0x2ba5bc807700} ERROR: <HttpSM.cc:6896
> (update_stats)> [1244] Slow Request: client_ip: 124.126.126.105:35775 url:
> http://live.aishang.ctlcdn.com/00000110240247_1/encoder/3/2016020214/1792253277_928813_5000000000.ts
> status: 200 unique id: redirection_tries: 0 bytes: 1050551 fd: 0 client
> state: 6 server state: 0 ua_begin: 0.000 ua_first_read: 0.000
> ua_read_header_done: 0.000 cache_open_read_begin: 0.000 cache_open_read_end:
> 0.225 dns_lookup_begin: -1.000 dns_lookup_end: -1.000 server_connect: -1.000
> server_first_read: -1.000 server_read_header_done: -1.000 server_close:
> -1.000 ua_close: 90.050 sm_finish: 90.057 plugin_active: -1.000 plugin_total:
> -1.000
> {noformat}
> Every client state is 6, which means 'client active timeout' (when we
> configure the transaction_active_timeout_in as 90 and 900, the condition is
> also the same), and the problem is related to 'http object size': when
> object_size > proxy.config.cache.target_fragment_size, the problem raised;
> when the target_fragment_size was modified to some value larger than
> object_size, the problem dissappeared.
> We are sure that the reason is cluster, as under no-cluster mode there is no
> such problem.
> Finally, the tracking progress is shown as below:
> The 'doc_size' was read out in the 'HttpSM::setup_cache_read_transfer' is -1,
> and this was corresponding to the timeout problem;
> when we backtracked the problem, it was found that when
> 'HttpSM::state_cache_open_read' was called the value of 'doc_size' was found
> as -1 when printed out.
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