In the Cassandra versions 2.1.11 - 2.1.16, after we decommission a node or datacenter, we observe the decommissioned nodes marked as DOWN in the cluster when you do a "nodetool describecluster". The nodes however do not show up in the "nodetool status" command. The decommissioned node also does not show up in the "system_peers" table on the nodes.
The workaround we follow is rolling restart of the cluster, which removes the decommissioned nodes from the "UNREACHABLE STATE", and shows the actual state of the cluster. The workaround is tedious for huge clusters. We also verified the decommission process in CCM tool, and observed the same issue for clusters with versions from 2.1.12 to 2.1.16. The issue was not observed in versions prior to or later than the ones mentioned above. Has anybody in the community observed similar issue? We've also raised a JIRA issue regarding this. https://issues.apache.org/jira/browse/CASSANDRA-13144 Below are the observed logs from the versions without the bug, and with the bug. The one's highlighted in yellow show the expected logs. The one's highlighted in red are the one's where the node is recognized as down, and shows as UNREACHABLE. Cassandra 2.1.1 Logs showing the decommissioned node : (Without the bug) 2017-01-19 20:18:56,415 [GossipStage:1] DEBUG ArrivalWindow Ignoring interval time of 2049943233 for /X.X.X.X 2017-01-19 20:18:56,416 [GossipStage:1] DEBUG StorageService Node /X.X.X.X state left, tokens [ 59353109817657926242901533144729725259, 60254520910109313597677907197875221475, 75698727618038614819889933974570742305, 84508739091270910297310401957975430578] 2017-01-19 20:18:56,416 [GossipStage:1] DEBUG Gossiper adding expire time for endpoint : /X.X.X.X (1485116334088) 2017-01-19 20:18:56,417 [GossipStage:1] INFO StorageService Removing tokens [100434964734820719895982857900842892337, 114144647582686041354301802358217767299, 132090888860517964702932350041942412177, 138409460913927199437556572481804704749] for /X.X.X.X 2017-01-19 20:18:56,418 [HintedHandoff:3] INFO HintedHandOffManager Deleting any stored hints for /X.X.X.X 2017-01-19 20:18:56,424 [GossipStage:1] DEBUG MessagingService Resetting version for /X.X.X.X 2017-01-19 20:18:56,424 [GossipStage:1] DEBUG Gossiper removing endpoint /X.X.X.X 2017-01-19 20:18:56,437 [GossipStage:1] DEBUG StorageService Ignoring state change for dead or unknown endpoint: /X.X.X.X 2017-01-19 20:19:02,022 [WRITE-/X.X.X.X] DEBUG OutboundTcpConnection attempting to connect to /X.X.X.X 2017-01-19 20:19:02,023 [HANDSHAKE-/X.X.X.X] INFO OutboundTcpConnection Handshaking version with /X.X.X.X 2017-01-19 20:19:02,023 [WRITE-/X.X.X.X] DEBUG MessagingService Setting version 7 for /X.X.X.X 2017-01-19 20:19:08,096 [GossipStage:1] DEBUG ArrivalWindow Ignoring interval time of 2074454222 for /X.X.X.X 2017-01-19 20:19:54,407 [GossipStage:1] DEBUG ArrivalWindow Ignoring interval time of 4302985797 for /X.X.X.X 2017-01-19 20:19:57,405 [GossipTasks:1] DEBUG Gossiper 60000 elapsed, /X.X.X.X gossip quarantine over 2017-01-19 20:19:57,455 [GossipStage:1] DEBUG ArrivalWindow Ignoring interval time of 3047826501 for /X.X.X.X 2017-01-19 20:19:57,455 [GossipStage:1] DEBUG StorageService Ignoring state change for dead or unknown endpoint: /X.X.X.X Cassandra 2.1.16 Logs showing the decommissioned node : (The logs in 2.1.16 show the same as 2.1.1 upto "DEBUG Gossiper 60000 elapsed, /X.X.X.X gossip quarantine over", and then is followed by "NODE is now DOWN" 017-01-19 19:52:23,687 [GossipStage:1] DEBUG StorageService.java:1883 - Node /X.X.X.X state left, tokens [-1112888759032625467, -228773855963737699, -311455042375 4381391, -4848625944949064281, -6920961603460018610, -8566729719076824066, 1611098831406674636, 7278843689020594771, 7565410054791352413, 9166885764, 8654747784805453046] 2017-01-19 19:52:23,688 [GossipStage:1] DEBUG Gossiper.java:1520 - adding expire time for endpoint : /X.X.X.X (1485114743567) 2017-01-19 19:52:23,688 [GossipStage:1] INFO StorageService.java:1965 - Removing tokens [-1112888759032625467, -228773855963737699, -3114550423754381391, -48486259449 49064281, -6920961603460018610, 5690722015779071557, 6202373691525063547, 7191120402564284381, 7278843689020594771, 7565410054791352413, 8524200089166885764, 865474778 4805453046] for /X.X.X.X 2017-01-19 19:52:23,689 [HintedHandoffManager:1] INFO HintedHandOffManager.java:230 - Deleting any stored hints for /X.X.X.X 2017-01-19 19:52:23,689 [GossipStage:1] DEBUG MessagingService.java:840 - Resetting version for /X.X.X.X 2017-01-19 19:52:23,690 [GossipStage:1] DEBUG Gossiper.java:417 - removing endpoint /X.X.X.X 2017-01-19 19:52:23,691 [GossipStage:1] DEBUG StorageService.java:1552 - Ignoring state change for dead or unknown endpoint: /X.X.X.X 2017-01-19 19:52:31,617 [MessagingService-Outgoing-/X.X.X.X] DEBUG OutboundTcpConnection.java:372 - attempting to connect to /X.X.X.X 2017-01-19 19:52:31,618 [HANDSHAKE-/X.X.X.X] INFO OutboundTcpConnection.java:488 - Handshaking version with /X.X.X.X 2017-01-19 19:52:31,619 [MessagingService-Outgoing-/X.X.X.X] DEBUG MessagingService.java:826 - Setting version 8 for /X.X.X.X 2017-01-19 19:53:19,914 [GossipStage:1] DEBUG FailureDetector.java:423 - Ignoring interval time of 6004119075 for /X.X.X.X 2017-01-19 19:53:23,702 [GossipTasks:1] DEBUG Gossiper.java:795 - 60000 elapsed, /X.X.X.X gossip quarantine over 2017-01-19 19:53:23,985 [GossipStage:1] DEBUG StorageService.java:1552 - Ignoring state change for dead or unknown endpoint: /X.X.X.X 2017-01-19 19:53:26,223 [GossipStage:1] DEBUG FailureDetector.java:423 - Ignoring interval time of 6309159352 for /X.X.X.X 2017-01-19 19:53:50,709 [GossipTasks:1] DEBUG Gossiper.java:336 - Convicting /X.X.X.X with status LEFT - alive true 2017-01-19 19:53:50,709 [GossipTasks:1] INFO Gossiper.java:1008 - InetAddress /X.X.X.X is now DOWN 2017-01-19 19:53:50,709 [GossipTasks:1] DEBUG MessagingService.java:429 - Resetting pool for /X.X.X.X 2017-01-19 19:53:51,710 [GossipTasks:1] DEBUG Gossiper.java:336 - Convicting /X.X.X.X with status LEFT - alive false 2017-01-19 19:53:53,711 [MessagingService-Outgoing-/X.X.X.X] DEBUG OutboundTcpConnection.java:372 - attempting to connect to /X.X.X.X 2017-01-19 19:53:53,711 [GossipTasks:1] DEBUG Gossiper.java:336 - Convicting /X.X.X.X with status LEFT - alive false 2017-01-19 19:53:54,711 [GossipTasks:1] DEBUG Gossiper.java:336 - Convicting /X.X.X.X with status LEFT - alive false thanks Sai
