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https://issues.apache.org/jira/browse/TS-2259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13781941#comment-13781941
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James Peach commented on TS-2259:
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I'm currently working on supporting log collation for the error log, but after
that I was planning to work on log host failover. Here's my plan to implement
this in a compatible way for 4.x ...
Currently, we support logging to multiple log hosts, let's call this a target
group. The first step is to add support for a <Failover/> tag. This tag nests
inside the CollationHosts tag and turns it from a target group into a failover
group. The semantics of a failover group are that ATS will log to the first
member, switching to subsequent members when the current target fails.
Now we can support failover, but we have broken target groups. We can bring
back target group support my allowing multiple CollationHosts tags. Each
CollationHosts tag can be defined as a target group or a failover group. The
final target group is the union of all the target groups defined by the
CollationHosts tag.
This is a compatible change for 4.x because none of the semantics are altered
until the administrator adds the new <Failover/> tag.
> Introduce failover for logging system
> -------------------------------------
>
> Key: TS-2259
> URL: https://issues.apache.org/jira/browse/TS-2259
> Project: Traffic Server
> Issue Type: New Feature
> Components: Logging
> Reporter: Yunkai Zhang
>
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