Apache Hadoop 2.8.2 Release Notes

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

Permissions are now checked when moving a file to Trash.

Allow a block to complete if the number of replicas on live nodes, decommissioning nodes and nodes in maintenance mode satisfies minimum replication factor. The fix prevents block recovery failure if replica of last block is being decommissioned. Vice versa, the decommissioning will be stuck, waiting for the last block to be completed. In addition, file close() operation will not fail due to last block being decommissioned.

Switch the default ADLS access token provider type from Custom to ClientCredential.

New fsck option “-upgradedomains” has been added to display upgrade domains of any block.

Reverted HDFS-10797 to fix a scalability regression brought by the commit.

The size of the TCP socket buffers are no longer hardcoded by default. Instead the OS now will automatically tune the size for the buffer.