4. Behavioral Changes

Behavioral changes denote a marked change in behavior from the previously released version to this version of software. In HDP 2.4.0, behavioral changes affect the following Hadoop components.

Table 1.4. Behavioral Changes

Hortonworks Bug ID Component Apache JIRA Summary Details

Debian 6 support deprecated.

Hortonworks Bug ID	Component	Summary	Details
		Debian 6 support deprecated.	HDP support for Debian 6 is deprecated with HDP 2.4.0. Support for Debian 6 will be removed in a future HDP release.
BUG-50775	YARN	Enable collection of debug information by default	Scenario: Container failures during job execution. Previous Behavior: New feature - no previous behaviour. New Behavior: This feature(enabled by default) enables generation of additional information which is useful for debugging container failures. The extra information generated is: A copy of the `launch_container.sh` script. A listing of the contents of the container work directory. This information is automatically collected if log-aggregation is enabled, or ignored and discarded if log-aggregation is disabled. The feature can be disabled by setting `yarn.nodemanager.log-container-debug-info.enabled` to `false` in `yarn-site.xml`.
BUG-50786	Tez	Increase the default value for MAX_COUNTERS	The default value of the max counter limit has been increased from 2000 to: tez.counters.max: 10000 tez.counters.max.groups: 3000

HDP support for Debian 6 is deprecated with HDP 2.4.0.

Support for Debian 6 will be removed in a future HDP release.

BUG-50775

YARN

Enable collection of debug information by default

Scenario: Container failures during job execution.

Previous Behavior: New feature - no previous behaviour.

New Behavior: This feature(enabled by default) enables generation of additional information which is useful for debugging container failures. The extra information generated is:

A copy of the launch_container.sh script.
A listing of the contents of the container work directory.

This information is automatically collected if log-aggregation is enabled, or ignored and discarded if log-aggregation is disabled. The feature can be disabled by setting yarn.nodemanager.log-container-debug-info.enabled to false in yarn-site.xml.

BUG-50786

Tez

Increase the default value for MAX_COUNTERS

The default value of the max counter limit has been increased from 2000 to:

tez.counters.max: 10000
tez.counters.max.groups: 3000

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