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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2169) Enable creation of nodes with TTLs
Date Wed, 04 May 2016 07:26:12 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15270242#comment-15270242

Hadoop QA commented on ZOOKEEPER-2169:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 1742171.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    -1 javac.  The patch appears to cause tar ant target to fail.

    -1 findbugs.  The patch appears to cause Findbugs (version 2.0.3) to fail.

    +1 release audit.  The applied patch does not increase the total number of release audit

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/3151//testReport/
Console output: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/3151//console

This message is automatically generated.

> Enable creation of nodes with TTLs
> ----------------------------------
>                 Key: ZOOKEEPER-2169
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2169
>             Project: ZooKeeper
>          Issue Type: New Feature
>          Components: c client, java client, jute, server
>    Affects Versions: 3.6.0
>            Reporter: Camille Fournier
>            Assignee: Jordan Zimmerman
>             Fix For: 3.6.0
>         Attachments: ZOOKEEPER-2169.patch
> As a user, I would like to be able to create a node that is NOT tied to a session but
that WILL expire automatically if action is not taken by some client within a time window.
> I propose this to enable clients interacting with ZK via http or other "thin clients"
to create ephemeral-like nodes.
> Some ideas for the design, up for discussion:
> The node should support all normal ZK node operations including ACLs, sequential key
generation, etc, however, it should not support the ephemeral flag. The node will be created
with a TTL that is updated via a refresh operation. 
> The ZK quorum will watch this node similarly to the way that it watches for session liveness;
if the node is not refreshed within the TTL, it will expire.
> 1) Should we let the refresh operation set the TTL to a different base value?
> 2) If so, should the setting of the TTL to a new base value cause a watch to fire?
> 3) Do we want to allow these nodes to have children or prevent this similar to ephemeral

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