question: private void updateDiskGCRVV ( RegionVersionVector diskRVV , RegionVersionVector inMemoryRVV , VersionSource member ) { long diskVersion = diskRVV . getVersionForMember ( member ) ; long memoryGCVersion = inMemoryRVV . getGCVersion ( member ) ; if ( memoryGCVersion <= diskVersion ) { diskRVV . recordGCVersion ( member , memoryGCVersion ) ; } }
target:  Update the on disk GC version for the given member, only if the disk has actually recorded all of the updates including that member.