Konstantin Shvachko created HDFS-12943:
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Summary: Consistent Reads from Standby Node
Key: HDFS-12943
URL: https://issues.apache.org/jira/browse/HDFS-12943
Project: Hadoop HDFS
Issue Type: New Feature
Components: hdfs
Reporter: Konstantin Shvachko
StandbyNode in HDFS is a replica of the active NameNode. The states of the
NameNodes are coordinated via the journal. It is natural to consider
StandbyNode as a read-only replica. As with any replicated distributed system
the problem of stale reads should be resolved. Our main goal is to provide
reads from standby in a consistent way in order to enable a wide range of
existing applications running on top of HDFS.
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