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https://issues.apache.org/jira/browse/HDFS-7363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kai Zheng reopened HDFS-7363:
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Assignee: Kai Zheng
Let me reuse this item as a sub task of HDFS-7337, where BlockGrouper is
defined for this purpose as part of a codec. Its role:
Given desired data blocks, BlockGrouper calculates and arranges a BlockGroup
for encoding. Different code can have different layout about a BlockGroup. In
LRC(6, 2, 2), we have 3 child block groups: 2 local groups plus 1 global group;
In RS, we have 1 block group. Given a BlockGroup with some blocks missing,
BlockGroups also calculates and determines how to recover if recoverable, like
using which blocks to recover a missing block. With such information the
corresponding ErasureCoder can
perform the concrete decoding work.
> Pluggable algorithms to form block groups in erasure coding
> -----------------------------------------------------------
>
> Key: HDFS-7363
> URL: https://issues.apache.org/jira/browse/HDFS-7363
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Zhe Zhang
> Assignee: Kai Zheng
>
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