[jboss-jira] [JBoss JIRA] (JGRP-1770) Table: null row when removing last element

[Bela Ban (JIRA)]

Bela Ban created JGRP-1770:
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             Summary: Table: null row when removing last element
                 Key: JGRP-1770
                 URL: https://issues.jboss.org/browse/JGRP-1770
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.5


In Table.removeMany() when nulling the last column of a row, we don't null the entire row. The effect is that we have rows (arrays) with all columns being empty remain in memory, which wastes memory.
Note that Table.purge() actually does null entire rows, this is called by
* NAKACK2: here, method stable() triggered by STABLE calls {{Table.purge(seqno)}}, so we're nulling entire rows. This is not a problem.
* UNICAST3 *sender entries*: here, reception of an ACK(seqno) also calls {{Table.purge(seqno)}}, so this is not an issue, either

The only issue is UNICAST3 *receiver entries*: here, {{Table.purge()}} is never called; elements are only nulled, but not entire rows.

SOLUTION:
When {{Table.removeMany()}} nulls an element, if that element is tha last element of a row (index = {{elements_per_row -1}}, then null the entire row.

EFFECT:
There's less memory held in memory by UNICAST3 receiver entries

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