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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7510) Notify clients that bootstrap is finished over binary protocol
Date Wed, 09 Jul 2014 13:33:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056228#comment-14056228
] 

Brandon Williams commented on CASSANDRA-7510:
---------------------------------------------

bq. Are you sure that it means "I'm ready to receive client connections"? My reading of the
code is that STATUS_NORMAL is sent as part of SS.joinTokenRing which is itself part of SS.initServer.
The latter being called in CassandraDaemon.setup before we start the thrift and native protocol
servers.

If the node needs to bootstrap, it will send JOINING because joinTokenRing will call bootstrap
which sets it.  It won't send NORMAL until bootstrap finishes and then it calls setTokens.
 Now, this is all before it returns control from initServer back to CassandraDaemon.setup,
so there is a *very* small chance it could gossip it to another node before the rpc servers
are started, but the only way around that is giving control of rpc startup to SS which feels
ugly.

> Notify clients that bootstrap is finished over binary protocol
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-7510
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7510
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Joost Reuzel
>            Priority: Minor
>             Fix For: 2.0.10
>
>         Attachments: 7510.txt
>
>
> Currently, Cassandra will notify clients when a new node is added to a cluster. However,
that node is typically not usable yet. It first needs to gossip its key range and finish loading
all its assigned data before it allows clients to connect. Depending on the amount of data
this may take quite a while. The clients in the mean time have no clue about the bootstrap
status of that node. The only thing they can do is periodically check if it will accept a
connection. 
> My proposal would be to send an additional UP event when the bootstrap is done, this
allows clients to mark the node initially as down/unavailable and simply wait for the UP event
to arrive.
> Kind regards,
> Joost



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