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From Veiko Kukk <veiko.k...@gmail.com>
Subject Re: very long cache_open_read_end - timeout
Date Mon, 26 Feb 2018 08:15:22 GMT
Hi Bryan,

We decided to create 4 volumes. No strong reasoning behind it, just 2
seemed too little to avoid those blocking timeouts and 4 was next
comfortable to set using 25%.

Veiko


2018-02-23 21:21 GMT+02:00 Bryan Call <bcall@apache.org>:

> Veiko,
>
> How many volumes did you create?
>
> -Bryan
>
>
> On Feb 23, 2018, at 3:14 AM, Veiko Kukk <veiko.kukk@gmail.com> wrote:
>
> Hi, Mateusz
>
> I wonder if you might experience same issue as me.
> https://github.com/apache/trafficserver/issues/3057
>
> For me, solution, or I would rather call it workaround was to create
> volumes.
>
> Unfortunately, documentation regarding to storage performance
> issues/tuning is missing.
>
> Best regards,
> Veiko
>
>
> 2018-02-22 13:59 GMT+02:00 Mateusz Zajakala <zajakala@gmail.com>:
>
>> Hi,
>>
>> I have a problem - from time to time my ATS 7.2.1 has problems with
>> serving static files from origin, client transactions last over 10s and I
>> see the following diagnostic (I have enabled logging "slow requests")
>>
>>  cache_open_read_begin: 0.000 cache_open_read_end: 10.640
>>
>> Any requests to the same URL are blocked for over 10s. Restarting ATS
>> solves the problem.
>>
>> What does it mean? Does it have to do with open_read feature?  but the
>> timeouts don't add...
>>
>> Any suggestions appreciated!
>>
>> Here's my records.config with configs related to avoiding thundering
>> herd...
>>
>> CONFIG proxy.config.cache.enable_read_while_writer INT 1
>> CONFIG proxy.config.http.background_fill_active_timeout INT 0
>> CONFIG proxy.config.http.background_fill_completed_threshold FLOAT
>> 0.000000
>> CONFIG proxy.config.cache.read_while_writer.max_retries INT 5
>> CONFIG proxy.config.cache.read_while_writer_retry.delay INT 200
>> CONFIG proxy.config.http.cache.max_open_read_retries INT 5
>> CONFIG proxy.config.http.cache.open_read_retry_time INT 200
>>
>> CONFIG proxy.config.http.cache.open_write_fail_action INT 2
>>
>>
>
>

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