plasma: Optimize backIndex lookup to reduce read amplification

• Type: Improvement
• Resolution: Fixed
• Priority: Major
• Fix Version/s: 5.5.0
• Affects Version/s: 5.5.0
• Component/s: secondary-index
• Labels:

  • plasma
  • vulcan-commited

For Gerrit Dashboard: MB-27836
#	Subject	Branch	Project	Status	CR	V
88684,3	MB-27836 Implement on-demand page segment reading	unstable	plasma	Status: MERGED	+2	+1
88685,3	MB-27836 test: Enhance TestPlasmaIteratorSwapin for multiple page segments	unstable	plasma	Status: MERGED	+2	+1
88686,3	MB-27836 Optimize page swapin by avoiding delta iteration	unstable	plasma	Status: MERGED	+2	+1
88687,2	MB-27836 Add reader num_lss_reads stats	unstable	plasma	Status: MERGED	+2	+1
88828,1	MB-27836 test: Add test for lss_data_size during compact after eviction	unstable	plasma	Status: MERGED	+2	+1
88829,1	MB-27836 page_walker: Fix incorrect data size decrement during page compaction	unstable	plasma	Status: MERGED	+2	+1
88993,2	MB-27836 page: Force swapin page only when full marshal is performed	unstable	plasma	Status: MERGED	+2	+1