Post on 19-May-2015
description
LATENCYTHE SILENT
MONITORING SYSTEM KILLER
Saturday, 21 January 2012
#MONITORINGSUCKS
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SCALABILITY
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execute large volumes of monitoring checks under a variety of conditions
(good + bad) with a consistent throughput
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CONSISTENT THROUGHPUT
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SHORT CHECK EXECUTION TIME
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WHAT INTRODUCES VARIABILITY?
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LATENCY INTRODUCED c SYNCHRONOUS CALLS
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= 1 monitoring check
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150 monitoring checkseach executed every 300 secondseach takes 1 secondchecks are executed serially
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all checks executed in 150 secondsmonitoring system at 50% capacity
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DOUBLE THE CHECKS
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all checks executed in 300 secondsmonitoring system at 100% capacity
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DOUBLE THE EXECUTION TIME
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all checks executed in 600 secondsmonitoring system at 200% capacityonly 50% of the checks are “on time”
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CHECK LATENCY
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HOW DO WE FIX THIS!?
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PERFORMANCE ANALYSIS!
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AN ANALOGY
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MONITORING CHECK ==
“ACTION” ON MVC WEB APP
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SEPARATE DATA COLLECTION
FROM
THRESHOLDINGf NOTIFICATIONS
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THIS SHIFTS LATENCY
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IT DOES NOT ELIMINATE IT!
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RRDTOOL IS EVIL
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USE SOMETHING BETTER!
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USE
OPENTSDBOR
GANGLIAWITH
CHECK_TSDBOR
CHECK_GMOND
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A DIFFERENT SET a PROBLEMS
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STORAGE WILL GO AWAY
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CHAOS WILL ENSUE
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PAGERS WILL MELT
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SET UP “META-
PARENTING”
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BUILD A KILL SWITCH
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READ MORE ABOUT THIS:
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bit.ly/yN4mdy
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