[HADOOP-11550] Enhance ErasureCoder API to support multiple encoding/decoding steps - ASF JIRA

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Details

Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: None
Labels:
None

Description

In ~~HADOOP-11646~~, ErasureCoder API is defined to support encoding/decoding of a block group considering the most simple but often case that only one coding step is involved. This is to enhance the API to support complex cases requiring multiple steps for encoding/decoding of a block group.

Recovering parity blocks will be supported here also, because it involves at least two steps: step 1. recover data blocks first; step2. call encoder to compute the erased parity blocks with all the ready data blocks.