Kidd53685368 opened a new pull request, #4901:
URL: https://github.com/apache/hadoop/pull/4901
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### Description of PR
[JIRA-HDFS-16776](https://issues.apache.org/jira/browse/HDFS-16776)
The length of targets should be checked when DN gets a EC reconstruction
task.For some reason
([HDFS-14768](https://issues.apache.org/jira/browse/HDFS-14768),
[HDFS-16739](https://issues.apache.org/jira/browse/HDFS-16739)) , the length of
targets will be larger than additionalReplRequired which causes some elements
in targets get the default value 0. It may trigger the bug which leads to the
data corrupttion just like
[HDFS-14768](https://issues.apache.org/jira/browse/HDFS-14768).
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