Apache Hadoop 0.23.5 Release Notes

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

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• HADOOP-8926 | Major | hadoop.util.PureJavaCrc32 cache hit-ratio is low for static data

Speed up Crc32 by improving the cache hit-ratio of hadoop.util.PureJavaCrc32

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• HDFS-4080 | Major | Add a separate logger for block state change logs to enable turning off those logs

Add a separate logger “BlockStateChange” for block state change logs.