Uma Maheswara Rao G created HDFS-15760:
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Summary: Validate the target indices in ErasureCoding worker in
reconstruction process
Key: HDFS-15760
URL: https://issues.apache.org/jira/browse/HDFS-15760
Project: Hadoop HDFS
Issue Type: Improvement
Components: ec
Affects Versions: 3.4.0
Reporter: Uma Maheswara Rao G
As we have seen issues like
# HDFS-15186
# HDFS-14768
It is a good idea to validate the indices at the ECWorker side and skip the
unintended in indices from target list.
Both of the issues triggered because, NN accidentally scheduled for
reconstruction in decom process due to busy node. We have fixed to make sure NN
considers busy nodes as live replicas. However, it may be good idea to safe
gaud the condition at ECWorker also in case if any other condition triggers and
that leads ECWroker to calculate the indices similar the above issues, then EC
function returns wrong o/p. I think it's ok to recover only the missing
indices from the given src indices.
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