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https://issues.apache.org/jira/browse/HDFS-8839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651460#comment-14651460
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Li Bo commented on HDFS-8839:
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hi, Zhe, I remember HDFS-8820 handles the situation that a cluster is smaller
than 9 datanodes. For a cluster with 9 nodes, if one node fails, the namenode
should still allocate 9 locations even it knows one of them is invalid.
Otherwise, the client writing can't go on.
> Erasure Coding: client occasionally gets less block locations when some
> datanodes fail
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-8839
> URL: https://issues.apache.org/jira/browse/HDFS-8839
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Li Bo
> Assignee: Li Bo
>
> 9 datanodes, write two block groups. A datanode dies when writing the first
> block group. When client retrieves the second block group from namenode, the
> returned block group only contains 8 locations occasionally.
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