[jira] [Created] (HDFS-10461) Erasure Coding: Optimize block checksum recalculation logic on the fly by reconstructing multiple missed blocks at a time

["Rakesh R (JIRA)" <ji...@apache.org>]

Rakesh R created HDFS-10461:
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             Summary: Erasure Coding: Optimize block checksum recalculation logic on the fly by reconstructing multiple missed blocks at a time
                 Key: HDFS-10461
                 URL: https://issues.apache.org/jira/browse/HDFS-10461
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Rakesh R
            Assignee: Rakesh R


This is HDFS-9833 follow-on task. HDFS-9833 is recomputing only one block checksum a time. The reconstruction logic can be further optimized by reconstructing multiple blocks at a time.

There are several case to be considered like, 

case-1) Live Block indices : {{0, 4, 5, 6, 7, 8}} - consecutive missing data blocks 1, 2, 3
case-2) Live Block indices : {{0, 2, 4, 6, 7, 8}} - jumbled missing data blocks 1, 3, 5




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