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From "Shalin Shekhar Mangar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-8777) Duplicate Solr process can cripple a running process
Date Wed, 09 Mar 2016 20:08:40 GMT

    [ https://issues.apache.org/jira/browse/SOLR-8777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15187828#comment-15187828
] 

Shalin Shekhar Mangar commented on SOLR-8777:
---------------------------------------------

bq. I suppose we could spin for a while waiting for the previous ephemeral node to disappear,
and if it doesn't, error out and refuse to start?

Yeah, spinning for say 2 * sessionTimeout should do the trick. This effectively removes this
optimisation for fast node restarts and we can look into bringing it back in some form at
a later date.

bq. Not completely related, but it seems like there's a bug in jetty's SocketConnector. It
uses the ServerSocket constructor that automatically binds the port, then attempts to set
setReuseAddress(), which makes no sense. It should use the other constructor, set the reuse_address
option, then call bind() manually.

Perhaps [~joakime] or [~gregw] can chime in here?

bq. In other news, I don't know that there's a way to change Jetty's startup sequence.. the
best I could do is try to use reflection to pull the connectors off the Server and start them
early. But that seems ungood.

Theoretically, now that we control the app server -- we could move to using embedded Jetty
(like we do for tests with JettySolrRunner) and control the lifecycle pretty much exactly
but that is way overkill for this issue.

> Duplicate Solr process can cripple a running process
> ----------------------------------------------------
>
>                 Key: SOLR-8777
>                 URL: https://issues.apache.org/jira/browse/SOLR-8777
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 5.3.1
>            Reporter: Shalin Shekhar Mangar
>
> Thanks to [~mewmewball] for catching this one.
> Accidentally executing the same instance of Solr twice causes the second start instance
to die with an "Address already in use", but not before deleting the first instance's live_node
entry, emitting "Found a previous node that still exists while trying to register a new live
node <node> - removing existing node to create another".
> The second start instance dies and its ephemeral node is then removed, causing /live_nodes/<node>
to be empty since the first start instance's live_node was deleted by the second.



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