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https://issues.apache.org/jira/browse/CASSANDRA-8791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372498#comment-14372498
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Stuart Bishop commented on CASSANDRA-8791:
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The legend in the 'nodetool status' output should list UD? instead if just UD 
(so 1 more character)

I'm reasonably certain I've seen ? as a transient state with 2.1. In any case, 
tools parsing nodetool output need to be aware of the possiblity as lines 
starting with ? are possibly the most important ones but simple parsers will 
skip those lines entirely (like a nagios check alerting on down nodes, and 
neglecting to alert if something is really screwy and you have ? nodes).

> 'nodetool status' reports nodes in undocumented '?' state
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-8791
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8791
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Stuart Bishop
>            Priority: Minor
>             Fix For: 2.1.4
>
>
> 'nodetool status' self documents the node status with the statement 
> 'Status=Up/Down' which corresponds to the 'U' and 'D' statuses in the first 
> column of the node listing.
> There is also a very important '?' status that is not documented, which seems 
> to appear when a node is bootstrapping.
> Automation and deployment tools need to cope with nodes in this transition 
> state, and the first step is to inform them about it in the documentation.



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