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hadoop-common-project/hadoop-common/src/site/markdown/release/3.1.2/RELEASENOTES.3.1.2.md

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Apache Hadoop 3.1.2 Release Notes

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

  • HADOOP-15638 | Major | KMS Accept Queue Size default changed from 500 to 128 in Hadoop 3.x

Restore the KMS accept queue size to 500 in Hadoop 3.x, making it the same as in Hadoop 2.x.

  • HADOOP-15677 | Major | WASB: Add support for StreamCapabilities

WASB: Support for StreamCapabilities.

  • HADOOP-15684 | Critical | triggerActiveLogRoll stuck on dead name node, when ConnectTimeoutException happens.

When a namenode A sends request RollEditLog to a remote NN, either the remote NN is standby or IO Exception happens, A should continue to try next NN, instead of getting stuck on the problematic one. This Patch is based on trunk.

  • HADOOP-14445 | Major | Use DelegationTokenIssuer to create KMS delegation tokens that can authenticate to all KMS instances
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This patch improves the KMS delegation token issuing and authentication logic, to enable tokens to authenticate with a set of KMS servers. The change is backport compatible, in that it keeps the existing authentication logic as a fall back.

Historically, KMS delegation tokens have ip:port as service, making KMS clients only able to use the token to authenticate with the KMS server specified as ip:port, even though the token is shared among all KMS servers at server-side. After this patch, newly created tokens will have the KMS URL as service.

A DelegationTokenIssuer interface is introduced for token creation.

  • YARN-8986 | Minor | publish all exposed ports to random ports when using bridge network

support -p and -P for bridge type network;

  • YARN-9071 | Critical | NM and service AM don't have updated status for reinitialized containers

In progress upgrade status may show READY state sooner than actual upgrade operations. External caller to upgrade API is recommended to wait minimum 30 seconds before querying yarn app -status.

  • YARN-9084 | Major | Service Upgrade: With default readiness check, the status of upgrade is reported to be successful prematurely

Improve transient container status accuracy for upgrade.

  • HADOOP-15996 | Major | Plugin interface to support more complex usernames in Hadoop

This patch enables "Hadoop" and "MIT" as options for "hadoop.security.auth_to_local.mechanism" and defaults to 'hadoop'. This should be backward compatible with pre-HADOOP-12751.

This is basically HADOOP-12751 plus configurable + extended tests.