[Xapian-tickets] [Xapian] #3: Replace Xapian::ErrorHandler

[Xapian]

#3: Replace Xapian::ErrorHandler
-------------------------+-------------------------------
 Reporter:  Olly Betts   |             Owner:  Olly Betts
     Type:  enhancement  |            Status:  assigned
 Priority:  lowest       |         Milestone:  2.0.0
Component:  Library API  |           Version:  git master
 Severity:  minor        |        Resolution:
 Keywords:               |        Blocked By:
 Blocking:               |  Operating System:  All
-------------------------+-------------------------------
Changes (by Olly Betts):

 * version:  SVN trunk => git master
 * milestone:  1.4.x => 2.0.0

Comment:

 [2399442c690b7c032c7e165ec9e4b647d0cb0955] removed the `ErrorHandler`
 class from git master (in 2017).

 The original webtop motivation seems the main one here - i.e. when
 searching several remote servers, have a way to present results from those
 that respond even if one fails to.  I struggle to see another realistic
 use case.

 I don't believe we've had user requests for such a feature since webtop,
 which was over 20 years ago so I'm bumping the milestone for this.

 The simplest way to handle this situation is just to retry the query - it
 means a slow response when a server fails and means setting timeouts
 appropriately matters, but it means the system always gives complete
 results.  Results excluding one server are problematic as (a) users may
 notice if they fail to find a document they know is there and (b) further
 search results where the bad server does respond may be inconsistent (for
 example, narrowing the query by adding a term could return more results;
 also if paging does another search then the paging may be inconsistent).
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Ticket URL: <https://trac.xapian.org/ticket/3#comment:16>
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