[jira] [Created] (HDFS-12662) lost+found strategy for bad/corrupt blocks to improvate data replication 'SLA' for small clusters

["Gruust (JIRA)" <ji...@apache.org>]

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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