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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-13855) URL Seed provider
Date Wed, 17 Jan 2018 20:55:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328759#comment-16328759
] 

Jason Brown edited comment on CASSANDRA-13855 at 1/17/18 8:54 PM:
------------------------------------------------------------------

[~gangil] This is a nice start, thanks!. Here are my initial thoughts:
 - you don't need a reference to {{Config}}. By convention, usually do everything config-related
through {{DatabaseDescriptor}}
 - you don't need to instantiate a new {{ArrayList}} in {{#getSeeds()}} (right before the
try block), as that instance only used in the case of an exception being thrown. In that case
we can collapse the two {{catch}} blocks down to one, and just create the empty {{ArrayList}}
there (You might be able to use {{Collections#emptyList}} to avoid instantiating an empty
list).

 - set connect and read timeouts. You already have the {{URLConnection}} object, so you can
call {{#setReadTimeout}} and so on before opening up the input stream (the socket/connection
is lazily created at that point, not when when you instantiate the {{URLConnection}})

 - retry logic - I'm not sure we need this (or if it's beyond the scope of this ticket), or
we can do it in a follow up ticket. wdyt, [~rustyrazorblade]?
 - TLS support - If we do need this, we can do this in a follow up ticket

 - in {{#getUrlContent}}, please close the resources in a {{finally}} block.
 - might want to log a warning if there are no seeds returned from the call


was (Author: jasobrown):
[~akash] This is a nice start, thanks!. Here are my initial thoughts:
 - you don't need a reference to {{Config}}. By convention, usually do everything config-related
through {{DatabaseDescriptor}}
 - you don't need to instantiate a new {{ArrayList}} in {{#getSeeds()}} (right before the
try block), as that instance only used in the case of an exception being thrown. In that case
we can collapse the two {{catch}} blocks down to one, and just create the empty {{ArrayList}}
there (You might be able to use {{Collections#emptyList}} to avoid instantiating an empty
list).

 - set connect and read timeouts. You already have the {{URLConnection}} object, so you can
call {{#setReadTimeout}} and so on before opening up the input stream (the socket/connection
is lazily created at that point, not when when you instantiate the {{URLConnection}})

 - retry logic - I'm not sure we need this (or if it's beyond the scope of this ticket), or
we can do it in a follow up ticket. wdyt, [~rustyrazorblade]?
 - TLS support - If we do need this, we can do this in a follow up ticket

 - in {{#getUrlContent}}, please close the resources in a {{finally}} block.
 - might want to log a warning if there are no seeds returned from the call

> URL Seed provider
> -----------------
>
>                 Key: CASSANDRA-13855
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13855
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Coordination, Core
>            Reporter: Jon Haddad
>            Assignee: Akash Gangil
>            Priority: Minor
>              Labels: lhf
>         Attachments: 0001-Add-URL-Seed-Provider-trunk.txt
>
>
> Seems like including a dead simple seed provider that can fetch from a URL, 1 line per
seed, would be useful.



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