“Apache Hadoop” 2.10.2 Release Notes

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

If the caller does not supply a permission, DFSClient#mkdirs and DFSClient#primitiveMkdir will create a new directory with the default directory permission 00777 now, instead of 00666.

Mover could have fail after 20+ minutes if a block move was enqueued for this long, between two DataNodes due to an internal constant that was introduced for Balancer, but affected Mover as well. The internal constant can be configured with the dfs.balancer.max-iteration-time parameter after the patch, and affects only the Balancer. Default is 20 minutes.

In the Dockerfile, nodejs is upgraded to 8.17.0 and yarn 1.12.1 is installed.

The build image has been upgraded to Bionic.

WARNING: No release note provided for this change.

Removed findbugs from the hadoop build images and added spotbugs instead. Upgraded SpotBugs to 4.2.2 and spotbugs-maven-plugin to 4.2.0.

When Timeline Service V1 or V1.5 is used, if “yarn.resourcemanager.system-metrics-publisher.timeline-server-v1.enable-batch” is set to true, ResourceManager sends timeline events in batch. The default value is false. If this functionality is enabled, the maximum number that events published in batch is configured by “yarn.resourcemanager.system-metrics-publisher.timeline-server-v1.batch-size”. The default value is 1000. The interval of publishing events can be configured by “yarn.resourcemanager.system-metrics-publisher.timeline-server-v1.interval-seconds”. By default, it is set to 60 seconds.

log4j 1 was replaced with reload4j which is fork of log4j 1.2.17 with the goal of fixing pressing security issues.

If you are depending on the hadoop artifacts in your build were explicitly excluding log4 artifacts, and now want to exclude the reload4j files, you will need to update your exclusion lists <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-reload4j</artifactId> </exclusion> <exclusion> <groupId>ch.qos.reload4j</groupId> <artifactId>reload4j</artifactId> </exclusion>