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https://issues.apache.org/jira/browse/HBASE-2327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-2327.
-----------------------------------
Resolution: Fixed
Tested a few times. Works ok. I'm a bit concerned about what would happen if
the elastic IP association takes too long. Committed to trunk and 0.20 branch.
We can revisit if there are problems in practice.
> [EC2] Allocate elastic IP addresses for ZK and master nodes
> -----------------------------------------------------------
>
> Key: HBASE-2327
> URL: https://issues.apache.org/jira/browse/HBASE-2327
> Project: Hadoop HBase
> Issue Type: Sub-task
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Fix For: 0.20.4, 0.21.0
>
> Attachments: HBASE-2327.patch
>
>
> Amazon EC2 supports Elastic IP Addresses to implement the effect of having a
> static IP address for public servers running on EC2. Up on hbase-users@ there
> was some recent discussion, confirmed, that when an EC2 instance queries the
> external DNS name of an elastic IP address, EC2 DNS returns the internal IP
> address of the instance to which the elastic IP address is bound, so it is
> safe to use elastic IPs for the ZK and master nodes. We gain the ability to
> do transparent replacement of one instance, e.g. failed, with another without
> incurring any additional cost.
> Update {{launch-hbase-zookeeper}} and {{launch-hbase-master}} to allocate
> elastic IPs:
> {noformat}
> $ ec2-allocate-address
> ADDRESS 1.1.1.1
> {noformat}
> and then assign the elastic IP address to the appropriate instance(s):
> {noformat}
> $ ec2-associate-address -i i-11111111 1.1.1.1
> ADDRESS 1.1.1.1 i-11111111
> {noformat}
> and then get the external DNS name to use when performing substitutions on
> master and slave configs:
> {noformat}
> $ ec2-describe-instances i-11111111 | egrep ^INSTANCE | cut -f4
> ec2-1-1-1-1.compute-1.amazonaws.com
> {noformat}
> When shutting down the cluster, just release the elastic IPs after
> terminating the instances:
> {noformat}
> ec2-release-address 1.1.1.1
> ...
> {noformat}
> NOTE: AWS accounts default to a limit of 5 Elastic IP addresses but most will
> run with 1 master and 3 or 1 ZK instances. And, the ZK ensemble can be
> shared.
> A follow up issue can address making scripts to launch replacements for
> failed instances transparently.
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