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https://issues.apache.org/jira/browse/TS-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Rushford updated TS-4287:
------------------------------
Description:
Parent Selection now supports the use of origin servers in the parent list.
It would be useful to add a simple retry feature that would try another parent
when a 404 response is received for content that may not be available on one
origin but may be available on another parent origin in the parent list. This
can happen when packagers are pushing live video chunks to multiple origins and
a request comes into an origin that may not yet have received the requested
file.
It would also be useful to mark a parent origin down and retry a request using
another parent origin if a 503 unavailable response is received or if some
other other application 5xx response were received.
A pull request will follow this ticket that adds the following configuration
parameters to parent.config and that implements the retry functionality.
The following new configuration parameters are available in parent.config when
parent_is_proxy is false (parent origin):
'parent_retry', 'unavailable_server_retry_responses', 'max_simple_retries',
and 'max_unavailable_server_retries'.
'parent_retry' - May be set to the value: 'simple_retry',
'unavailable_server_retry', or 'both'. parent_retry is disabled by default
and may only be enabled with one of these values when 'parent_is_proxy' is
false (parent origin).
if 'parent_retry' is set to 'simple_retry' another parent will be retried when
a 404 response is received from the parent origin. By default only one retry
will be attempted for a 404 response but this may be increased from 1 to 5 with
'max_simple_retries' parameter.
if 'parent_retry' is set to 'unavailable_server_retry' and a response is
received that is contained in a configurable list of response codes (503 by
default), the parent that returned the code is marked down and another parent
is retried. By default only one retry will be attempted but his may be
increased from 1 to 5 using the 'max_unavailable_server_retries' configuration
parameter.
'unavailable_server_retry_responses' is an optional comma separated list of
response codes that may be configured to trigger a unavailable_server_retry
when 'parent_retry' is set to 'unavailable_server_retry'. If not specified in
the parent.config, the default response code is 503.
If 'parent_retry' is set to 'both' then both simple_retry and
unavailable_server_retry are enabled for this list of parents.
'max_simple_retries' is set to 1 by default but may be increased within the
range 1 to 5.
'max_unavailable_server_retries' is set to 1 by default but may be increased
within the range 1 to 5.
was:
Parent Selection now supports the use of origin servers in the parent list.
It would be useful to add a simple retry feature that would try another parent
when a 404 response is received for content that may not be available on one
origin but may be available on another parent origin in the parent list. This
can happen when packagers are pushing live video chunks to multiple origins and
a request comes into an origin that may not yet have received the requested
file.
It would also be useful to mark a parent origin down and retry a request using
another parent origin if a 503 unavailable response is received or if some
other other application 5xx response were received.
A pull request will follow this ticket that adds the following configuration
parameters to parent.config and that implements the retry functionality.
The following new configuration parameters are available in parent.config when
parent_is_proxy is false (parent origin):
'parent_retry', 'dead_server_retry_responses', 'max_simple_retries', and
'max_dead_server_retries'.
'parent_retry' - May be set to the value: 'simple_retry', 'dead_server_retry',
or 'both'. parent_retry is disabled by default and may only be enabled with
one of these values when 'parent_is_proxy' is false (parent origin).
if 'parent_retry' is set to 'simple_retry' another parent will be retried when
a 404 response is received from the parent origin. By default only one retry
will be attempted for a 404 response but this may be increased from 1 to 5 with
'max_simple_retries' parameter.
if 'parent_retry' is set to 'dead_server_retry' and a response is received that
is contained in a configurable list of response codes (503 by default), the
parent that returned the code is marked down and another parent is retried. By
default only one retry will be attempted but his may be increased from 1 to 5
using the 'max_dead_server_retries' configuration parameter.
'dead_server_retry_responses' is an optional comma separated list of response
codes that may be configured to trigger a dead_server_retry when 'parent_retry'
is set to 'dead_server_retry'. If not specified in the parent.config, the
default response code is 503.
If 'parent_retry' is set to 'both' then both simple_retry and dead_server_retry
are enabled for this list of parents.
'max_simple_retries' is set to 1 by default but may be increased within the
range 1 to 5.
'max_dead_server_retries' is set to 1 by default but may be increased within
the range 1 to 5.
Summary: Add a simple and unavailable server retry feature to Parent
Selection. (was: Add a simple and dead server retry feature to Parent
Selection)
> Add a simple and unavailable server retry feature to Parent Selection.
> ----------------------------------------------------------------------
>
> Key: TS-4287
> URL: https://issues.apache.org/jira/browse/TS-4287
> Project: Traffic Server
> Issue Type: New Feature
> Components: Parent Proxy
> Reporter: John Rushford
> Assignee: John Rushford
> Fix For: 6.2.0
>
>
> Parent Selection now supports the use of origin servers in the parent list.
> It would be useful to add a simple retry feature that would try another
> parent when a 404 response is received for content that may not be available
> on one origin but may be available on another parent origin in the parent
> list. This can happen when packagers are pushing live video chunks to
> multiple origins and a request comes into an origin that may not yet have
> received the requested file.
> It would also be useful to mark a parent origin down and retry a request
> using another parent origin if a 503 unavailable response is received or if
> some other other application 5xx response were received.
> A pull request will follow this ticket that adds the following configuration
> parameters to parent.config and that implements the retry functionality.
> The following new configuration parameters are available in parent.config
> when parent_is_proxy is false (parent origin):
> 'parent_retry', 'unavailable_server_retry_responses',
> 'max_simple_retries', and 'max_unavailable_server_retries'.
> 'parent_retry' - May be set to the value: 'simple_retry',
> 'unavailable_server_retry', or 'both'. parent_retry is disabled by default
> and may only be enabled with one of these values when 'parent_is_proxy' is
> false (parent origin).
> if 'parent_retry' is set to 'simple_retry' another parent will be retried
> when a 404 response is received from the parent origin. By default only one
> retry will be attempted for a 404 response but this may be increased from 1
> to 5 with 'max_simple_retries' parameter.
> if 'parent_retry' is set to 'unavailable_server_retry' and a response is
> received that is contained in a configurable list of response codes (503 by
> default), the parent that returned the code is marked down and another parent
> is retried. By default only one retry will be attempted but his may be
> increased from 1 to 5 using the 'max_unavailable_server_retries'
> configuration parameter.
> 'unavailable_server_retry_responses' is an optional comma separated list of
> response codes that may be configured to trigger a unavailable_server_retry
> when 'parent_retry' is set to 'unavailable_server_retry'. If not specified
> in the parent.config, the default response code is 503.
> If 'parent_retry' is set to 'both' then both simple_retry and
> unavailable_server_retry are enabled for this list of parents.
> 'max_simple_retries' is set to 1 by default but may be increased within the
> range 1 to 5.
> 'max_unavailable_server_retries' is set to 1 by default but may be increased
> within the range 1 to 5.
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