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https://issues.apache.org/jira/browse/HDFS-7864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14344990#comment-14344990
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GAO Rui commented on HDFS-7864:
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@Jing Zhao
#After reading "HDFSErasureCodingDesign-20150206.pdf" and some of the related
source codes, Considering both ErasureCoding mechanism and description of this
Jira. I think "striped blocks" in this Jira's description actually denotes to
"BlockGroup" in "HDFSErasureCodingDesign-20150206.pdf" , right? In
"HDFSErasureCodingDesign-20150206.pdf" the term "striped blocks" has never been
used.
#For example, in the case of "striping and ReedÂSolomon (6,3) schema", a
"BlockGroup" is consist of 6 "data blocks" and 3 "parity blocks", so a
"BlockGroup" should be counted as 9 received blocks, right?
> Erasure Coding: Update safemode calculation for striped blocks
> --------------------------------------------------------------
>
> Key: HDFS-7864
> URL: https://issues.apache.org/jira/browse/HDFS-7864
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Jing Zhao
> Assignee: GAO Rui
>
> We need to update the safemode calculation for striped blocks. Specifically,
> each striped block now consists of multiple data/parity blocks stored in
> corresponding DataNodes. The current code's calculation is thus inconsistent:
> each striped block is only counted as 1 expected block, while each of its
> member block may increase the number of received blocks by 1.
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