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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1755) Putting 'Meta' table into ZooKeeper
Date Mon, 14 Sep 2009 16:17:59 GMT

    [ 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."

> 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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