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From "Alex Petrov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12509) Shutdown process triggered twice during if the node is drained
Date Thu, 29 Sep 2016 13:19:20 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Petrov updated CASSANDRA-12509:
------------------------------------
    Assignee: Alex Petrov
    Reviewer: Stefania
      Status: Patch Available  (was: Open)

Moving the bugfix here from [CASSANDRA-12461], re-triggering CI:

|[12509-trunk|https://github.com/ifesdjeen/cassandra/tree/12509-trunk]|[dtest|http://cassci.datastax.com/job/ifesdjeen-12509-trunk-dtest/]|[utest|http://cassci.datastax.com/job/ifesdjeen-12509-trunk-testall/]|
|[12509-3.0|https://github.com/ifesdjeen/cassandra/tree/12509-3.0]|[dtest|http://cassci.datastax.com/job/ifesdjeen-12509-3.0-dtest/]|[utest|http://cassci.datastax.com/job/ifesdjeen-12509-3.0-testall/]|

> Shutdown process triggered twice during if the node is drained
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-12509
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12509
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Alex Petrov
>            Assignee: Alex Petrov
>
> If the node is drained, the {{StorageService#drain}} [method|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/service/StorageService.java#L4212]
is called, which triggers shutdown of mutation stage, messaging service, compaction, batchlog
etc. In the end of this process, the node is moved to {{DRAINED}} status with the process
still running. 
> When JVM is shutdown, the JVM shutdown hooks are ran, which are subscribed during the
server initialisation: {{Runtime.getRuntime().addShutdownHook(drainOnShutdown);}} [here|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/service/StorageService.java#L575-L636].

> I noticed this behaviour while reviewing [CASSANDRA-12461], as if we'd like add custom
pre and post-shutdown hooks, most likely it makes sense to run them once (or user might expect
such behaviour). 
> Is this behaviour correct? Should we run whole shutdown process twice or just once in
"drain" and no-op during JVM shutdown?  



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