[HDFS-14546] Document block placement policies

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.1, 3.4.0
• Fix Version/s: 3.3.1, 3.4.0
• Component/s: documentation
• Labels: documentation
• Target Version/s: 3.3.1, 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Amithsha
• Reporter: Íñigo Goiri
• Created: 04/Jun/19 22:42
• Updated: 11/Feb/24 12:48
• Resolved: 21/Jun/20 12:00

Description

Currently, all the documentation refers to the default block placement policy.
However, over time there have been new policies:

• BlockPlacementPolicyRackFaultTolerant (HDFS-7891)
• BlockPlacementPolicyWithNodeGroup (HDFS-3601)
• BlockPlacementPolicyWithUpgradeDomain (HDFS-9006)

We should update the documentation to refer to them explaining their particularities and probably how to setup each one of them.

Issue Links

• relates to: HDFS-14220 Enable Replica Placement Value Per Rack