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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3842) [UMBRELLA] Remove non-transient data from ZooKeeper
Date Fri, 22 May 2015 21:24:17 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14556851#comment-14556851
] 

Sean Busbey commented on ACCUMULO-3842:
---------------------------------------

my understanding was that proper configuration changes were going to be one of the features
built on top of procv2. Unfortunately, I'm similarly only kind-of-paying-attention to the
feature.

> [UMBRELLA] Remove non-transient data from ZooKeeper
> ---------------------------------------------------
>
>                 Key: ACCUMULO-3842
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3842
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client, tserver
>            Reporter: Josh Elser
>             Fix For: 1.8.0
>
>
> Wanted to start brainstorming about this.
> We store a lot of persistent data in ZooKeeper that would better stored in something
backed by HDFS. ZooKeeper can be a very convenient place to store persisted data so that it's
available to all nodes, but it comes at a price and often must be asynchronously accessed
to achieve good performance.
> * Table/Namespace configuration
> * Users/Authorizations
> * Problem reports (maybe?)
> * System configuration overrides (maybe?)
> Some benefits we'd see from this:
> * Loss of ZooKeeper doesn't lose table configuration and users.
> * Greatly reduce zookeeper watchers (assume watchers=50*num_tables*num_tservers)
> * Consistent updates of table constraints and all other table properties
> The last note is the most important one IMO. The number of test issues alone that we've
had with constraints not being seen on all servers are bound to affect users.



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