[jira] [Commented] (CASSANDRA-7825) node decommission leaves ghost nodes in system.peers table and JMX

["Yuping Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867164#comment-16867164 ] 

Yuping Wang commented on CASSANDRA-7825:
----------------------------------------

Hi,

 thanks for all of the information. Questions:

  was this concluded as a Cassandra bug or DSE? The history showed there was reopen and patch in April 2019. But the resolution status shows no reproducible. Can you please elaborate what happened?

> node decommission leaves ghost nodes in system.peers table and JMX
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-7825
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7825
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: OS: Ubuntu 12.04.4 LTS
> Cassandra: ReleaseVersion: 2.0.8.39
> DSE 4.5.1
> OpsCenter: 5.0.0
>            Reporter: nayden kolev
>            Assignee: Brandon Williams
>            Priority: Low
>
> I have a 4-node cluster (split in 2 DCs) running DSE 4.5.1, C* 2.0.8.39. I needed to cycle a node (add a new node and remove one). I followed this doc (more specifically steps 1 and 2):
> http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_remove_node_t.html
> After the decom, the decommissioned node logged this:
> INFO [RMI TCP Connection(17)-10.1.129.27] 2014-08-23 09:57:08,243 ThriftServer.java (line 141) Stop listening to thrift clients
> INFO [RMI TCP Connection(17)-10.1.129.27] 2014-08-23 09:57:08,269 Server.java (line 182) Stop listening for CQL clients
> INFO [RMI TCP Connection(17)-10.1.129.27] 2014-08-23 09:57:08,270 Gossiper.java (line 1279) Announcing shutdown
> INFO [RMI TCP Connection(17)-10.1.129.27] 2014-08-23 09:57:10,271 MessagingService.java (line 683) Waiting for messaging service to quiesce
> INFO [ACCEPT-/10.1.129.27] 2014-08-23 09:57:10,272 MessagingService.java (line 923) MessagingService has terminated the accept() thread
> INFO [RMI TCP Connection(17)-10.1.129.27] 2014-08-23 09:57:10,280 StorageService.java (line 1007) DECOMMISSIONED
> The decommissioned node no longer appears in OpsCenter, and 'nodetool status' shows it gone from the cluster as well, with the remaining 4 nodes un UN state.
> All is good... Then I noticed that the DownEndpointCount (still) shows as 1 - using a JMX console, and browsing to org.apache.cassandra.net, FailureDetector, Attributes, DownEdpointCount. While there, I also noticed that SimpleStates shows the decommissioned node as down, and the AllEndpointStates shows it as STATUS:LEFT
> I tried running a 'nodetool removenode decom-node's-host-id', but it failed with "Host ID not found", which I expected, given I decommissioned it and it does not show in nodetool status.
> nodetool describecluster lists only the expected 4 nodes (does not show the decommissioned node)
> checking the system.peers table lists the decomm-ed node with a null host_id, rack, release_version, rpc_address, schema_version, etc.
> Adding JVM_OPTS="$JVM_OPTS -Dcassandra.load_ring_state=false" to the Cassandra-env.sh as suggested here:
> https://issues.apache.org/jira/browse/CASSANDRA-6053
> does not help. I have actually tried this before, when I was decommissioning a node on an older C* version and it worked, but now it does nothing. If I delete the row mentioning the decommissioned node from the system.peers table it stays out of there until the next dse service restart.
> This is causing apps to timeout, since they get a invalid node's IP... As a workaround I remove the entry from the peers table, but it is not permanent...



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