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From GitBox <...@apache.org>
Subject [GitHub] [fluo-muchos] arvindshmicrosoft commented on a change in pull request #270: Support Accumulo installs on Microsoft Azure
Date Thu, 08 Aug 2019 22:10:30 GMT
arvindshmicrosoft commented on a change in pull request #270: Support Accumulo installs on
Microsoft Azure
URL: https://github.com/apache/fluo-muchos/pull/270#discussion_r312264013
 
 

 ##########
 File path: ansible/roles/common/tasks/os.yml
 ##########
 @@ -17,6 +17,12 @@
 
 - name: "set swappiness to zero"
   sysctl: name=vm.swappiness value=0
+- name: "set vm.min_free_kbytes to 1G"
 
 Review comment:
   Thanks for the question, Keith. In our performance tests on Azure, we found that with larger
numbers of test clients (we are testing with cingest) per tserver node, and with large native
maps, we were hitting strange "page allocation failure" errors (not OOM killer though) with
symptoms similar to those described in these threads:
   * https://bugzilla.kernel.org/show_bug.cgi?id=107111
   * https://access.redhat.com/solutions/90883
   * https://serverfault.com/questions/236170/page-allocation-failure-am-i-running-out-of-memory
   
   Again, if you prefer we keep these conditional when cluster_type == 'azure', that's easy
for us to do.

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