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From Thiru M <>
Subject Spike in SOLR Process and Frequent GC
Date Sat, 27 Aug 2016 15:08:53 GMT
Dear Folks,

We are using Solr 5.4.0 - "stand-alone" mode in our production boxes hosted
in Red Hat Enterprise Linux (RHEL) OS.

Each box have number of different cores. Have attached the screenshot shot
with the Solr core & system details.

1. Earlier indexing was performed every 30 minutes in both production

2. In linux-a server 30 (stand-alone) cores created on same day and content
indexed into it,

3. we then spotted unusual GC performing every 2 to 7 seconds in linux-a
server and the  Solr process spiked,

4. Then we removed the indexing in linux-a server for a week, monitored the
both Solr process and GC.(No indexing performed during this time),

5. No one uses the system during night time which we ensured it from our
end. But both Solr process and GC were in its peak, even "during non
business hours",

6. Have restated Solr instance in linux-a server. GC started again after
Solr instance brought up,

7. In linux-b server no spike in Solr process and no issues with GC,

We couldn't figure out why Solr process is hight and GC performing
frequently in linux-a server.

Have anyone encountered similar issue?
Can anyone help to suggest on ways to spot the issue please ?

Thirukumaran M

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