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Special Forums UNIX and Linux Applications Infrastructure Monitoring Event processing & machine learning in monitoring system Post 302821333 by DGPickett on Friday 14th of June 2013 11:44:01 AM
Old 06-14-2013
There is some of this sort of event predition in network protocols, to detect defective or slow paths to avoid, but servers are just supposed to run, not fail, predictable or not. The two flavors of handling this are parallel redundant concurrent load division where a dead server is detected and not sent any more load until it can respond to periodic tests. Recovery from services sent to a dying server is mostly left to client retry, but some systems of transactional middleware do requeue services that do not run to final commit, so they are run on alternative servers. Of course, query services are easier to handle than churn, where you need to rollback all when there is failure, before you requeue. Some systems do not use transactions, but structure churn so it can be applied any number of times and not have duplicate side effects (history filtering or believe the last of that seq. #).
 

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bup-server(1)						      General Commands Manual						     bup-server(1)

NAME
bup-server - the server side of the bup client-server relationship SYNOPSIS
bup server DESCRIPTION
bup server is the server side of a remote bup session. If you use bup-split(1) or bup-save(1) with the -r option, they will ssh to the remote server and run bup server to receive the transmitted objects. There is normally no reason to run bup server yourself. MODES
smart In this mode, the server checks each incoming object against the idx files in its repository. If any object already exists, it tells the client about the idx file it was found in, allowing the client to download that idx and avoid sending duplicate data. This is bup-server's default mode. dumb In this mode, the server will not check its local index before writing an object. To avoid writing duplicate objects, the server will tell the client to download all of its .idx files at the start of the session. This mode is useful on low powered server hard- ware (ie router/slow NAS). FILES
$BUP_DIR/bup-dumb-server Activate dumb server mode, as discussed above. This file is not created by default in new repositories. SEE ALSO
bup-save(1), bup-split(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-server(1)
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