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From "Stefania (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-9156) Make the echo callback idempotent in markAlive
Date Mon, 07 Dec 2015 07:42:11 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-9156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stefania updated CASSANDRA-9156:
--------------------------------
    Component/s: Distributed Metadata

> Make the echo callback idempotent in markAlive
> ----------------------------------------------
>
>                 Key: CASSANDRA-9156
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9156
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Distributed Metadata
>            Reporter: Stefania
>            Assignee: Stefania
>            Priority: Minor
>             Fix For: 3.x
>
>
> As discussed in CASSANDRA-7816, in Gossiper.markAlive we send an echo before calling
realMarkAlive. However sometimes we send multiple echos before we get an answer and as a consequence
realMarkAlive could be called multiple times. 
> We should make the echo callback idempotent, i.e., we should make EndpointState#isAlive
an AtomicBoolean, and use CAS in EndpointState#markAlive and EndpointState #markDead, returning
the CAS result (that is, if it was actually dead and turned alive, and vice-versa): this could
be used by the Gossiper to conditionally execute realMarkAlive.
> This would avoid executing realMarkAlive multiple times.



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