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From "Taras Ledkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-4756) Print info about partition distribution to log
Date Fri, 08 Sep 2017 10:09:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-4756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158415#comment-16158415
] 

Taras Ledkov commented on IGNITE-4756:
--------------------------------------

[~javaller], looks good. Please do the minor cosmetic changes:
# {{GridAffinityAssignmentCache}} fix import order.
# {{GridAffinityAssignmentCache#printDistribution}} please use {{partsCnt}} instead of the
{{assignment.size()}} to calculate {{expectedCnt}}

> Print info about partition distribution to log 
> -----------------------------------------------
>
>                 Key: IGNITE-4756
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4756
>             Project: Ignite
>          Issue Type: Improvement
>          Components: general
>            Reporter: Taras Ledkov
>            Assignee: Vadim Opolski
>            Priority: Minor
>              Labels: newbie
>             Fix For: 2.3
>
>
> Summarize discussions:
> Add log message in case partitions distribution is not close to even distribution:
> # Add system property IGNITE_PART_DISTRIBUTION_WARN_THRESHOLD with default value 0.1
to print warn message only when nodes count differs more then threshold;
> # The statistic is calculated and printed only for the local node;
> # Statistic is placed at the {{GridAffinityAssignmentCache#calculate}} and calculated
for new {{idealAssignment}}.
> # Message format is
> {noformat}
> Local node affinity assignment distribution is not ideal [cache=<cache_name>, expectedPrimary=<ideal_count_of_primary_partitions>,
exectedBackups=<ideal_count_of_backups>, primary=<count_of_primary_partitions>,
backups=<count_of_backup_partitions>].
> {noformat}
> e.g. for cache with name "test", 2 backups, 4 partition, 3 nodes:
> {noformat}
> Local node affinity assignment distribution is not ideal [cache=test, expectedPrimary=1.33
(33.3%), exectedBackups=2.66 (66.66%), primary=1 (25%), backups=3(75%)].
> {noformat}



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