[jboss-jira] [JBoss JIRA] (JGRP-1982) RequestCorrelator: use IntHashMap / LongHashmap for request correlation

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144141#comment-13144141 ] 

Bela Ban edited comment on JGRP-1982 at 12/25/15 10:10 AM:
-----------------------------------------------------------

Even better: if we keep requests in an array, we don't need to maintain {{REQUEST_ID}} (in {{Request}}), e.g.:
{noformat}
offset=100 | R100 | R101 | R102 | R103 |
{noformat}

The next request would be R104, then R105 etc. The index into the current array plus the offset (which is adjusted on a compaction) give us a unique and monotonically increasing request-id.
Similar to {{Table}}, the array can grow, but it also can be compacted, e.g. by shifting elements in the array to the left (to index 0)...


was (Author: belaban):
Even better: if we keep requests in an array, we don't need to generate request-ids, e.g.:
{noformat}
offset=100 | R100 | R101 | R102 | R103 |
{noformat}

The next request would be R104, then R105 etc. The index into the current array plus the offset (which is adjusted on a compaction) give us a unique and monotonically increasing request-id.
Similar to {{Table}}, the array can grow, but it also can be compacted, e.g. by shifting elements in the array to the left (to index 0)...

> RequestCorrelator: use IntHashMap / LongHashmap for request correlation
> -----------------------------------------------------------------------
>
>                 Key: JGRP-1982
>                 URL: https://issues.jboss.org/browse/JGRP-1982
>             Project: JGroups
>          Issue Type: Enhancement
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>            Priority: Minor
>             Fix For: 3.6.7
>
>
> In RequestCorrelator (and possibly other classes), use an IntHashMap or LongHashmap for the request table. Goal: use less space when we have a lot of requests.



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