[HDFS-8255] Rename getBlockReplication to getPreferredBlockReplication

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Labels: BB2015-05-TBR
• Hadoop Flags: Reviewed
• Assignee: Zhe Zhang
• Reporter: Zhe Zhang
• Created: 26/Apr/15 05:20
• Updated: 30/Aug/16 01:35
• Resolved: 12/May/15 13:40

Description

We should rename BlockCollection#getBlockReplication to getPreferredBlockStorageNum for 2 reasons:

1. Currently, this method actually returns the preferred block replication factor instead of the actual number of replicas. The current name is a little ambiguous. getPreferredBlockStorageNum is also consistent with getPreferredBlockSize
2. With the erasure coding feature, the name doesn't apply to striped blocks.

Issue Links

• is required by: HDFS-8010 Erasure coding: extend UnderReplicatedBlocks to accurately handle striped blocks
• relates to: HDFS-4037 Rename the getReplication() method in BlockCollection to getBlockReplication()