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Investigate the cause of short but huge spikes in tp99
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Description

It happens once a day when QPS is at its highest point, we can see a huge spikes in tp99 (20sec) for the comp_suggest queries but a spike is also visible on full_test queries.
Looking at hive there's few queries (17 for March 22 around 20h30 UTC) that can take around 2 minutes to complete.
I'm not sure sure to understand, after looking at some nodes I see nothing obvious that could cause such spikes.

Event Timeline

dcausse created this task.Mar 23 2016, 2:32 PM
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