negative # of items and backfill_remaining under TAP_Queue clients section

[root@localhost ~]# /opt/membase/bin/mbstats localhost:11210 tap
ep_tap_ack_grace_period: 300
ep_tap_ack_interval: 1000
ep_tap_ack_window_size: 10
ep_tap_backoff_period: 5
ep_tap_bg_fetch_requeued: 0
ep_tap_bg_fetched: 0
ep_tap_bg_max_pending: 500
ep_tap_count: 2
ep_tap_deletes: 0
ep_tap_fg_fetched: 9873095
ep_tap_keepalive: 300
ep_tap_noop_interval: 20
ep_tap_queue_backfillremaining: 2
ep_tap_queue_backoff: 0
ep_tap_queue_drain: 9839195
ep_tap_queue_fill: 0
ep_tap_queue_itemondisk: 0
ep_tap_throttled: 0
ep_tap_total_backlog_size: 5
ep_tap_total_fetched: 9882314
ep_tap_total_queue: 2
eq_tapq:anon_180:connected: true
eq_tapq:anon_180:created: 393
eq_tapq:anon_180:num_checkpoint_end: 2966
eq_tapq:anon_180:num_checkpoint_end_failed: 0
eq_tapq:anon_180:num_checkpoint_start: 2966
eq_tapq:anon_180:num_checkpoint_start_failed: 0
eq_tapq:anon_180:num_delete: 0
eq_tapq:anon_180:num_delete_failed: 0
eq_tapq:anon_180:num_flush: 0
eq_tapq:anon_180:num_flush_failed: 0
eq_tapq:anon_180:num_mutation: 9805262
eq_tapq:anon_180:num_mutation_failed: 0
eq_tapq:anon_180:num_opaque: 2
eq_tapq:anon_180:num_opaque_failed: 0
eq_tapq:anon_180:num_unknown: 0
eq_tapq:anon_180:num_vbucket_set: 0
eq_tapq:anon_180:num_vbucket_set_failed: 0
eq_tapq:anon_180:pending_disconnect: false
eq_tapq:anon_180:reserved: 0
eq_tapq:anon_180:supports_ack: true
eq_tapq:anon_180:type: consumer
eq_tapq:replication_ns_1@10.2.1.15:ack_log_size: 61
eq_tapq:replication_ns_1@10.2.1.15:ack_playback_size: 61
eq_tapq:replication_ns_1@10.2.1.15:ack_seqno: 9845855
eq_tapq:replication_ns_1@10.2.1.15:ack_window_full: false
eq_tapq:replication_ns_1@10.2.1.15:bg_backlog_size: 0
eq_tapq:replication_ns_1@10.2.1.15:bg_jobs_completed: 0
eq_tapq:replication_ns_1@10.2.1.15:bg_jobs_issued: 0
eq_tapq:replication_ns_1@10.2.1.15:bg_queue_size: 0
eq_tapq:replication_ns_1@10.2.1.15:bg_queued: 0
eq_tapq:replication_ns_1@10.2.1.15:bg_result_size: 0
eq_tapq:replication_ns_1@10.2.1.15:bg_results: 0
eq_tapq:replication_ns_1@10.2.1.15:bg_wait_for_results: false
eq_tapq:replication_ns_1@10.2.1.15:complete: false
eq_tapq:replication_ns_1@10.2.1.15:connected: true
eq_tapq:replication_ns_1@10.2.1.15:created: 358
eq_tapq:replication_ns_1@10.2.1.15:disconnects: 1
eq_tapq:replication_ns_1@10.2.1.15:empty: false
eq_tapq:replication_ns_1@10.2.1.15:flags: 85 (ack,backfill,vblist,checkpoints)
eq_tapq:replication_ns_1@10.2.1.15:has_item: false
eq_tapq:replication_ns_1@10.2.1.15:has_queued_item: true
eq_tapq:replication_ns_1@10.2.1.15:idle: false
eq_tapq:replication_ns_1@10.2.1.15:num_tap_nack: 0
eq_tapq:replication_ns_1@10.2.1.15:num_tap_tmpfail_survivors: 0
eq_tapq:replication_ns_1@10.2.1.15:paused: 1
eq_tapq:replication_ns_1@10.2.1.15:pending_backfill: false
eq_tapq:replication_ns_1@10.2.1.15:pending_disconnect: false
eq_tapq:replication_ns_1@10.2.1.15:pending_disk_backfill: false
eq_tapq:replication_ns_1@10.2.1.15:qlen: 2
eq_tapq:replication_ns_1@10.2.1.15:qlen_high_pri: 0
eq_tapq:replication_ns_1@10.2.1.15:qlen_low_pri: 0
eq_tapq:replication_ns_1@10.2.1.15:queue_backfillremaining: 2
eq_tapq:replication_ns_1@10.2.1.15:queue_backoff: 0
eq_tapq:replication_ns_1@10.2.1.15:queue_drain: 9839194
eq_tapq:replication_ns_1@10.2.1.15:queue_fill: 0
eq_tapq:replication_ns_1@10.2.1.15:queue_itemondisk: 0
eq_tapq:replication_ns_1@10.2.1.15:queue_memory: 32
eq_tapq:replication_ns_1@10.2.1.15:rec_fetched: 9845855
eq_tapq:replication_ns_1@10.2.1.15:reconnects: 1
eq_tapq:replication_ns_1@10.2.1.15:recv_ack_seqno: 9845793
eq_tapq:replication_ns_1@10.2.1.15:reserved: 1
eq_tapq:replication_ns_1@10.2.1.15:supports_ack: true
eq_tapq:replication_ns_1@10.2.1.15:suspended: false
eq_tapq:replication_ns_1@10.2.1.15:total_backlog_size: 3
eq_tapq:replication_ns_1@10.2.1.15:type: producer
eq_tapq:replication_ns_1@10.2.1.15:vb_filter:

eq_tapq:replication_ns_1@10.2.1.15:vb_filters: 512