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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-3677) Generate a globally unique identifier for a cluster and store in /hbase/hbase.id
Date Mon, 21 Mar 2011 18:47:06 GMT
Generate a globally unique identifier for a cluster and store in /hbase/hbase.id

                 Key: HBASE-3677
                 URL: https://issues.apache.org/jira/browse/HBASE-3677
             Project: HBase
          Issue Type: Improvement
          Components: master
            Reporter: Gary Helmling
            Priority: Minor
             Fix For: 0.92.0

We don't currently have a way to uniquely identify an HBase cluster, apart for where it's
stored in HDFS or configuration of the ZooKeeper quorum managing it.  It would be generally
useful to be able to identify a cluster via API.

The proposal here is pretty simple:
# When master initializes the filesystem, generate a globally unique ID and store in /hbase/hbase.id
# For existing clusters, generate hbase.id on master startup if it does not exist
# Include unique ID in ClusterStatus returned from master

For token authentication, this will be required to allow selecting the correct token to pass
to a cluster when a single client is communicating to more than one HBase instance.

Chatting with J-D, replication stores it's own cluster id in place with each HLog edit, so
requires as small as possible an identifier, but I think we could automate a mapping from
unique cluster ID -> short ID if we had the unique ID available.

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