Apache Hadoop 2.8.3 Release Notes

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

Conf HTTP service should set response’s content type according to the Accept header in the request.

Configuration.dumpConfiguration no longer prints out the clear text values for the sensitive keys listed in `hadoop.security.sensitive-config-keys`. Callers can override the default list of sensitive keys either to redact more keys or print the clear text values for a few extra keys for debugging purpose.

Added new configuration “dfs.client.block.write.replace-datanode-on-failure.min-replication”.

The minimum number of replications that are needed to not to fail
  the write pipeline if new datanodes can not be found to replace
  failed datanodes (could be due to network failure) in the write pipeline.
  If the number of the remaining datanodes in the write pipeline is greater
  than or equal to this property value, continue writing to the remaining nodes.
  Otherwise throw exception.

  If this is set to 0, an exception will be thrown, when a replacement
  can not be found.