[IGNITE-4756] Print info about partition distribution to log

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.7
• Component/s: general
• Labels: newbie
• Assignee: Vyacheslav Daradur
• Reporter: Taras Ledkov
• Created: 27/Feb/17 12:28
• Updated: 26/Jun/18 17:50
• Resolved: 11/Apr/18 11:45

Description

Summarize discussions:
Add log message in case partitions distribution is not close to even distribution:

1. 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;
2. The statistic is calculated and printed only for the local node;
3. Statistic is placed at the GridAffinityAssignmentCache#calculate and calculated for new idealAssignment.
4. Message format is

   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>].
   

   e.g. for cache with name "test", 2 backups, 4 partition, 3 nodes:

   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%)].
   

Issue Links

• is related to: IGNITE-3018 Cache affinity calculation is slow with large nodes number
• is related to: IGNITE-8315 Prevent printing the partition distribution on clients nodes
• links to: GitHub Pull Request #3679
• links to: PR tests
• links to: Upsource review #531