AWS emr documentation change
Summary
Added explicit warnings about potential HDFS data loss during graceful decommissioning and emphasized data backup requirements
Security assessment
Changes address data integrity and availability risks during cluster operations but do not document security features or mitigate security vulnerabilities. The warnings about data loss relate to operational reliability rather than security controls.
Diff
diff --git a/emr/latest/ManagementGuide/emr-scaledown-behavior.md b/emr/latest/ManagementGuide/emr-scaledown-behavior.md index edd4224f0..874e17e9f 100644 --- a//emr/latest/ManagementGuide/emr-scaledown-behavior.md +++ b//emr/latest/ManagementGuide/emr-scaledown-behavior.md @@ -23 +23,9 @@ When terminate at task completion is specified, Amazon EMR deny lists and drains -Amazon EMR allows you to scale down your cluster without affecting your workload. Amazon EMR gracefully decommissions YARN, HDFS, and other daemons on core and task nodes during a resize down operation without losing data or interrupting jobs. Amazon EMR only reduces instance group size if the work assigned to the groups has completed and they are idle. For YARN NodeManager Graceful Decommission, you can manually adjust the time a node waits for decommissioning. +Amazon EMR allows you to scale down your cluster without affecting your workload. Amazon EMR attempts to gracefully decommission YARN, HDFS, and other daemons on core and task nodes during a resize down operation without losing data or interrupting jobs. Amazon EMR only reduces instance group size if the work assigned to the groups has completed and they are idle. For YARN NodeManager Graceful Decommission, you can manually adjust the time a node waits for decommissioning. + +###### Note + +When graceful decommissioning occurs, there can be data loss. Be sure to back up your data. + +###### Important + +It is possible that HDFS data can be permanently lost during the graceful replacement of an unhealthy core instance. We recommend that you always back up your data.