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From Henrik Brautaset Aronsen <henrik.aron...@gmail.com>
Subject Performance degradation after upgrading from 6.2.1 to 6.4.1
Date Tue, 14 Feb 2017 09:52:56 GMT
We are seeing performance degradation on our SolrCloud instances after
upgrading to 6.4.1.


Here are a couple of graphs.  As you can see, 6.4.1 was introduced 2/10
1200:


https://www.dropbox.com/s/qrc0wodain50azz/solr1.png?dl=0

https://www.dropbox.com/s/sdk30imm8jlomz2/solr2.png?dl=0


These are two very different usage scenarios:


* Solr1 has constant updates and very volatile data (30 minutes TTL, 20
shards with no replicas, across 8 servers).  Requests in the 99 percentile
went from ~400ms to 1000-1500ms. (Hystrix cutoff at 1.5s)


* Solr2 is a more traditional instance with long-lived data (updated once a
day, 24 shards with 2 replicas, across 8 servers).  Requests in the 99
percentile went from ~400ms to at least 1s. (Hystrix cutoff at 1s)


I've been looking around, but cannot really find a reason for the
performance degradation.  Does any of you have an idea?


Cheers,

Henrik

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