[SPARK-6112] Provide external block store support through HDFS RAM_DISK

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: Block Manager, Spark Core
• Assignee: Unassigned
• Reporter: Zhan Zhang
• Created: 02/Mar/15 18:16
• Updated: 17/May/20 18:20
• Resolved: 01/Mar/16 19:21

Description

HDFS Lazy_Persist policy provide possibility to cache the RDD off_heap in hdfs. We may want to provide similar capacity to Tachyon by leveraging hdfs RAM_DISK feature, if the user environment does not have tachyon deployed.

With this feature, it potentially provides possibility to share RDD in memory across different jobs and even share with jobs other than spark, and avoid the RDD recomputation if executors crash.

Issue Links

• is blocked by: SPARK-6479 Create external block store API
• is related to: SPARK-9203 Make filesystem pluggable in BlockStore and BlockManager
• links to: [Github] Pull Request #6449 (zhzhan)