[jboss-jira] [JBoss JIRA] Created: (JGRP-1049) Concurrent hashmaps: set parameters via system properties

[Bela Ban (JIRA)]

Concurrent hashmaps: set parameters via system properties
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                 Key: JGRP-1049
                 URL: https://jira.jboss.org/jira/browse/JGRP-1049
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 2.9


ConcurrentHashMap
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CCHMs have a default initial capacity (16), load factor (0.75) and concurrency level (16). These are OK for most
scenarios, but we have to investigate whether these values are sufficient for 1000 node clusters.

When for example 1000 threads from different senders access the same CCHM, we need to make sure we don't have high
contention, ie. by spreading a 1000 senders over 16 buckets.

Investigate whether we should add CCHM initial sizes, load factors and concurrency levels as system properties.

With ergonomics [1], we could for example set bucket sizes for CCHMs dynamically, e.g. based on cluster size.


[1] https://jira.jboss.org/jira/browse/JGRP-1037


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