[jira] Commented: (HBASE-1755) Putting 'Meta' table into ZooKeeper

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

    [ https://issues.apache.org/jira/browse/HBASE-1755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755055#action_12755055 ] 

stack commented on HBASE-1755:
------------------------------

"ZooKeeper was not designed to be a general database or large object store. Instead, it manages coordination data. This data can come in the form of configuration, status information, rendezvous, etc. A common property of the various forms of coordination data is that they are relatively small: measured in kilobytes. The ZooKeeper client and the server implementations have sanity checks to ensure that znodes have less than 1M of data, but the data should be much less than that on average. Operating on relatively large data sizes will cause some operations to take much more time than others and will affect the latencies of some operations because of the extra time needed to move more data over the network and onto storage media. If large data storage is needed, the usually pattern of dealing with such data is to store it on a bulk storage system, such as NFS or HDFS, and store pointers to the storage locations in ZooKeeper."  http://hadoop.apache.org/zookeeper/docs/r3.2.1/zookeeperProgrammers.html

> Putting 'Meta' table into ZooKeeper
> -----------------------------------
>
>                 Key: HBASE-1755
>                 URL: https://issues.apache.org/jira/browse/HBASE-1755
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.21.0
>            Reporter: Erik Holstad
>             Fix For: 0.21.0
>
>
> Talking at the hackathon about moving the Meta table into ZooKeeper.

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