Gruust created HDFS-12662:
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Summary: lost+found strategy for bad/corrupt blocks to improvate
data replication 'SLA' for small clusters
Key: HDFS-12662
URL: https://issues.apache.org/jira/browse/HDFS-12662
Project: Hadoop HDFS
Issue Type: Improvement
Components: block placement
Affects Versions: 2.8.1
Reporter: Gruust
Priority: Minor
Corrupt blocks currently need to be removed manually and effectively block the
data node on which they reside to receive a good copy of the same block. In
small clusters (ie. node count == replication factor), this prevents the name
node to find a free data node to keep the desired replication level up until
the user manually runs some fsck command to remove the corrupt block.
I suggest moving the corrupt block out of the way, like it's usually done by
ext2-based filesystems, ie. move the block to /lost+found directory, such that
the name node can replace it immediately.
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