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https://issues.apache.org/jira/browse/GEODE-229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anthony Baker closed GEODE-229.
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> Javadocs for DiskStoreFactory.setCompactionThreshold are incorrect
> ------------------------------------------------------------------
>
> Key: GEODE-229
> URL: https://issues.apache.org/jira/browse/GEODE-229
> Project: Geode
> Issue Type: Bug
> Reporter: Dan Smith
> Assignee: Dan Smith
> Fix For: 1.0.0-incubating.M1
>
>
> The javadocs for compaction-threshold imply that we compact as soon as the
> amount of garbage is equal or greater than the threshold.
> From DiskStoreFactory?.setCompactionThreshold
> {noformat}
> When the amount of garbage in an oplog exceeds this percentage then when a
> compaction
> * is done this garbage will be cleaned up freeing up disk space. Garbage
> is created by
> * entry destroys, entry updates, and region destroys.
> {noformat}
> However, looking at the code, it looks like we actually trigger compaction
> when the amount of non-garbage data is equal or less than the threshold:
> Here Oplog.needsCompaction, it looks like its saying the oplog needs
> compaction if the live count is less than the threshold.
> {code}
> long rvHWMtmp = this.totalCount.get();
> if (rvHWMtmp > 0) {
> long tlc = this.totalLiveCount.get();
> if (tlc < 0) {
> tlc = 0;
> }
> double rv = tlc;
> double rvHWM = rvHWMtmp;
> if (((rv / rvHWM) * 100) <= parent.getCompactionThreshold()) {
> return true;
> }
> }
> {code}
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