[HDFS-9667] StorageType: SSD precede over DISK

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0, 2.7.0
• Component/s: namenode
• Target Version/s: 2.7.3
• Tags: heterogeneous storage
• Assignee: chunde
• Reporter: chunde
• Created: 20/Jan/16 05:10
• Updated: 11/Feb/16 22:55
• Resolved: 20/Jan/16 19:05

Description

We enabled the heterogeneous storage in our cluster and there are only ~50% of datanode & regionserver hosts with SSD. We set hfile with ONE_SSD storagepolicy but we found block's all replica are DISK often even local host with SSD storage. The block placement do not choose SSD first to place replica.

Issue Links

• duplicates: HDFS-8361 Choose SSD over DISK in block placement