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  1. Couchbase Server
  2. MB-36618

Plasma stats have negative values for page_bytes, page_itemcnt, avg_page_size

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    Description

      Build : 6.5.0-4659

      Refer to MB-36613 & MB-36616 for the test details. Looking at the Plasma stats, some stats have negative values.

      ==== StorageStats ====
      [
      {
      "Index": "test:idx1", "Id": 730860754992284375, "PartitionId": 0,
      "Stats":
      {
      "MainStore":
      {
      "memory_quota":         18940805773,
      "punch_hole_support":   true,
      "count":                2911904,
      "compacts":             1216557,
      "purges":               0,
      "splits":               275239,
      "merges":               106292,
      "inserts":              2911904,
      "deletes":              0,
      "compact_conflicts":    153,
      "split_conflicts":      204,
      "merge_conflicts":      0,
      "insert_conflicts":     866,
      "delete_conflicts":     0,
      "swapin_conflicts":     0,
      "persist_conflicts":    13,
      "memory_size":          10364866142,
      "memory_size_index":    8418770331,
      "allocated":            883064758763,
      "freed":                872699892621,
      "reclaimed":            872697328498,
      "reclaim_pending":      2564123,
      "reclaim_list_size":    91386387,
      "reclaim_list_count":   620,
      "reclaim_threshold":    2,
      "allocated_index":      13565357631,
      "freed_index":          5146587300,
      "reclaimed_index":      5146536017,
      "num_pages":            168948,
      "items_count":          100100,
      "total_records":        435512,
      "num_rec_allocs":       13261691,
      "num_rec_frees":        13229986,
      "num_rec_swapout":      7310177,
      "num_rec_swapin":       6906370,
      "bytes_incoming":       143071639532,
      "bytes_written":        689071841280,
      "write_amp":            5.37,
      "write_amp_avg":        4.82,
      "lss_gc_status":        "frag 30, data: 47180392952, used: 68376806167, relocated: 1181884, retries: 93514, skipped: 1013998 log:(620693081321 - 689069887488)",
      "lss_fragmentation":    31,
      "lss_data_size":        47180598444,
      "lss_recoverypt_size":  163840,
      "lss_maxsn_size":       4096,
      "lss_used_space":       68381958144,
      "checkpoint_used_space":16836948085,
      "lss_num_reads":        4533280,
      "lss_read_bs":          1129048693619,
      "lss_blk_read_bs":      1128525692928,
      "lss_gc_num_reads":     3818866,
      "lss_gc_reads_bs":      934003504526,
      "lss_blk_gc_reads_bs":  951519924224,
      "lss_rdr_reads_bs":     0,
      "lss_blk_rdr_reads_bs": 0,
      "cache_hits":           2263810,
      "cache_misses":         648094,
      "cache_hit_ratio":      0.60286,
      "rlss_num_reads":       0,
      "rcache_hits":          0,
      "rcache_misses":        0,
      "rcache_hit_ratio":     0.00000,
      "resident_ratio":       0.07280,
      "mvcc_purge_ratio":     4.35077,
      "currSn":               702388,
      "gcSn":                 702386,
      "gcSnIntervals":       "[0 679274 684430 689581 694763 699961 702387]",
      "purger_running":       false,
      "mem_throttled":        false,
      "lss_throttled":        false,
      "lss_head_offset":      620693081321,
      "lss_tail_offset":      689071841280,
      "num_wctxs":            22,
      "num_readers":          24,
      "num_writers":          8,
      "buf_memused":          94027541,
      "page_bytes":           -1768164427,
      "page_cnt":             9883,
      "page_itemcnt":         -32575,
      "avg_item_size":        0,
      "avg_page_size":        -178909,
      "act_max_page_items":   4,
      "act_min_page_items":   1,
      "act_max_delta_len":    100,
      "est_resident_mem":     145059539213
      },
      "BackStore":
      {
      "memory_quota":         18940805773,
      "punch_hole_support":   true,
      "count":                1455952,
      "compacts":             397990,
      "purges":               0,
      "splits":               10994,
      "merges":               326,
      "inserts":              1455952,
      "deletes":              0,
      "compact_conflicts":    218,
      "split_conflicts":      125,
      "merge_conflicts":      0,
      "insert_conflicts":     467,
      "delete_conflicts":     0,
      "swapin_conflicts":     0,
      "persist_conflicts":    114,
      "memory_size":          156641206,
      "memory_size_index":    665123,
      "allocated":            873821934500,
      "freed":                873665293294,
      "reclaimed":            873665293123,
      "reclaim_pending":      171,
      "reclaim_list_size":    4100850,
      "reclaim_list_count":   17,
      "reclaim_threshold":    1,
      "allocated_index":      685287,
      "freed_index":          20164,
      "reclaimed_index":      20164,
      "num_pages":            10669,
      "items_count":          50050,
      "total_records":        98917,
      "num_rec_allocs":       20639355,
      "num_rec_frees":        20620579,
      "num_rec_swapout":      13803812,
      "num_rec_swapin":       13723671,
      "bytes_incoming":       72036012396,
      "bytes_written":        604006903808,
      "write_amp":            0.67,
      "write_amp_avg":        8.38,
      "lss_gc_status":        "frag 30, data: 3463294468, used: 5014716165, relocated: 1311104, retries: 174, skipped: 457203 log:(598983394006 - 603998134272)",
      "lss_fragmentation":    30,
      "lss_data_size":        3472333293,
      "lss_recoverypt_size":  163840,
      "lss_maxsn_size":       4096,
      "lss_used_space":       5060292608,
      "checkpoint_used_space":117,
      "lss_num_reads":        4086670,
      "lss_read_bs":          1385731435261,
      "lss_blk_read_bs":      1155309928448,
      "lss_gc_num_reads":     2931697,
      "lss_gc_reads_bs":      965876711861,
      "lss_blk_gc_reads_bs":  976206221312,
      "lss_rdr_reads_bs":     402968823967,
      "lss_blk_rdr_reads_bs": 178933850112,
      "cache_hits":           1579073,
      "cache_misses":         579830,
      "cache_hit_ratio":      0.67939,
      "rlss_num_reads":       1076305,
      "rcache_hits":          201652,
      "rcache_misses":        501299,
      "rcache_hit_ratio":     0.04545,
      "resident_ratio":       0.18982,
      "mvcc_purge_ratio":     1.97636,
      "currSn":               702388,
      "gcSn":                 702386,
      "gcSnIntervals":       "[0 679274 684430 689581 694763 699961 702387]",
      "purger_running":       false,
      "mem_throttled":        false,
      "lss_throttled":        false,
      "lss_head_offset":      598983394006,
      "lss_tail_offset":      604006903808,
      "num_wctxs":            22,
      "num_readers":          0,
      "num_writers":          8,
      "buf_memused":          91265010,
      "page_bytes":           207389216,
      "page_cnt":             553,
      "page_itemcnt":         20568,
      "avg_item_size":        10083,
      "avg_page_size":        375025,
      "act_max_page_items":   19,
      "act_min_page_items":   1,
      "act_max_delta_len":    30,
      "est_resident_mem":     5929985332
      }}
      }
      ]
      

      Check the values for the following stats for Mainstore.
      "page_bytes": -1768164427,
      "page_itemcnt": -32575,
      "avg_page_size": -178909,

      Attachments

        For Gerrit Dashboard: MB-36618
        # Subject Branch Project Status CR V

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            jliang John Liang
            mihir.kamdar Mihir Kamdar (Inactive)
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            Dates

              Created:
              Updated:
              Resolved:

              PagerDuty