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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7411) Use Netflix's Curator zookeeper library
Date Thu, 27 Jun 2013 05:08:22 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694491#comment-13694491
] 

stack commented on HBASE-7411:
------------------------------

No sure this patch will work [~enis]  There are wide gaps during which getZk() returns null.
 I could wait until recreated but then could be null by the time the client goes to use it.
 This is because we manage our own zk setup rather than let curator do it?  Related, i see
no curator recipes to help w/ idempotent operations (the short that recoverablezk writes at
the start of all data it writes).
                
> Use Netflix's Curator zookeeper library
> ---------------------------------------
>
>                 Key: HBASE-7411
>                 URL: https://issues.apache.org/jira/browse/HBASE-7411
>             Project: HBase
>          Issue Type: New Feature
>          Components: Zookeeper
>    Affects Versions: 0.95.2
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.95.2
>
>         Attachments: 7411v2.txt, 7411v2.txt, 7411v3.txt, 7411v4.txt, 7411v4.txt, hbase-7411_v0.patch
>
>
> We have mentioned using the Curator library (https://github.com/Netflix/curator) elsewhere
but we can continue the discussion in this.  
> The advantages for the curator lib over ours are the recipes. We have very similar retrying
mechanism, and we don't need much of the nice client-API layer. 
> We also have similar Listener interface, etc. 
> I think we can decide on one of the following options: 
> 1. Do not depend on curator. We have some of the recipes, and some custom recipes (ZKAssign,
Leader election, etc already working, locks in HBASE-5991, etc). We can also copy / fork some
code from there.
> 2. Replace all of our zk usage / connection management to curator. We may keep the current
set of API's as a thin wrapper. 
> 3. Use our own connection management / retry logic, and build a custom CuratorFramework
implementation for the curator recipes. This will keep the current zk logic/code intact, and
allow us to use curator-recipes as we see fit. 
> 4. Allow both curator and our zk layer to manage the connection. We will still have 1
connection, but 2 abstraction layers sharing it. This is the easiest to implement, but a freak
show? 
> I have a patch for 4, and now prototyping 2 or 3 whichever will be less painful. 
> Related issues: 
> HBASE-5547
> HBASE-7305
> HBASE-7212

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