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https://issues.apache.org/jira/browse/HBASE-2098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798274#action_12798274
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Andrew Purtell commented on HBASE-2098:
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@Berk: Thank you for all of the very helpful comment.
> [EC2] Build a HA cluster
> ------------------------
>
> Key: HBASE-2098
> URL: https://issues.apache.org/jira/browse/HBASE-2098
> Project: Hadoop HBase
> Issue Type: Sub-task
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Priority: Minor
> Fix For: 0.21.0
>
>
> The Hadoop NameNode is a single point of failure. If the master instance
> fails, HDFS is down; therefore, HBase as well. So we do not try to deploy
> HBase in a multimaster configuration for that reason. Instead we colocate the
> HDFS NameNode and HBase HMaster on the same instance and run with its failure
> as a known risk. As these EC2 scripts are starter scripts which can (and
> should) be customized, this is ok, but we can do better. We should deploy a
> fully fault tolerant Hadoop+HBase cluster as a worked example of how to do
> it.
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