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Apache Hadoop 0.23.9 Release Notes

These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

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• HDFS-4832 | Critical | Namenode doesn't change the number of missing blocks in safemode when DNs rejoin or leave

This change makes name node keep its internal replication queues and data node state updated in manual safe mode. This allows metrics and UI to present up-to-date information while in safe mode. The behavior during start-up safe mode is unchanged.