TeaKeeper: Hot standby support using bookkeeper
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Key: ZOOKEEPER-1016
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1016
Project: ZooKeeper
Issue Type: Improvement
Reporter: Ivan Kelly
Assignee: Ivan Kelly
Priority: Minor
Attachments: tledger.pdf
Currently Bookkeeper provides functionality for cold backups. If the entity
logging to bookkeeper fails, its replacement must recover the ledgers which had
been used for backup before becoming available. This is acceptable in some
cases, such as HBase Wals where a small delay in recovery only results in a
small percentage of data being unavailable.
However, systems such as the HDFS namenode, this delay can be unacceptable,
such as cases where data is being served to customers. Secondary namenodes
should be ready to go the instant the primary goes down.
TeaKeeper proposes a wrapper library around Bookkeeper providing T-Junction
like functionality for logging. It also provides for primary/secondary election
and automated hot failover.
HDFS namenode is primary target of this work.
The attached design doc contains more details.
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