[jira] Updated: (ZOOKEEPER-781) provide a generalized "connection strategy" for ZooKeeper clients

["Qian Ye (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Qian Ye updated ZOOKEEPER-781:
------------------------------

    Attachment: ZOOKEEPER-781.patch

add a draft patch for c client. Here, I add two function prototypes to support the strategy pattern. The conn_chooser_fn is used to initialize the hosts list, before the prime connection, and the conn_picker_fn is used to descide which hosts will be used in the next connection.

typedef int (*conn_chooser_fn)(int addrs_count, int *connect_index,
        struct sockaddr_storage *addrs);

typedef int (*conn_picker_fn)(int addrs_count, int *connect_index,
        struct sockaddr_storage *addrs);

the patch provide two build-in strategies, which support ordered round robin and randomized round robin like the previous version. Programmers can set their own chooser and piccker when they initalize the zookeeper handler.

> provide a generalized "connection strategy" for ZooKeeper clients
> -----------------------------------------------------------------
>
>                 Key: ZOOKEEPER-781
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-781
>             Project: ZooKeeper
>          Issue Type: New Feature
>          Components: c client, java client
>            Reporter: Patrick Hunt
>             Fix For: 3.4.0
>
>         Attachments: ZOOKEEPER-781.patch
>
>
> A connection strategy allows control over the way that ZooKeeper clients (we would implement this for both c and java apis) connect to a serving ensemble. Today we have two strategies, randomized round robin (default) and ordered round robin, both of which are hard coded into the client implementation. We would generalize this interface and allow users to create their own.
> See this page for more detail: http://wiki.apache.org/hadoop/ZooKeeper/ConnectionStrategy

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