listCorruptFileBlocks should be functional while the name node is still in safe
mode
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Key: HDFS-1476
URL: https://issues.apache.org/jira/browse/HDFS-1476
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Patrick Kling
This would allow us to detect whether missing blocks can be fixed using Raid
and if that is the case exit safe mode earlier.
One way to make listCorruptFileBlocks available before the name node has exited
from safe mode would be to perform a scan of the blocks map on each call to
listCorruptFileBlocks to determine if there are any blocks with no replicas.
This scan could be parallelized by dividing the space of block IDs into
multiple intervals than can be scanned independently.
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