The logic that makes namenode exit safemode should be pluggable
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Key: HDFS-1501
URL: https://issues.apache.org/jira/browse/HDFS-1501
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: dhruba borthakur
Assignee: Patrick Kling
HDFS RAID creates parity blocks for data blocks. So, even if all replicas of a
block is missing, it is possible ro recreate it from the parity blocks. Thus,
when the namenode restarts, it should use a different RAID-aware logic to
figure out whether all blocks are healthy or not.
My proposal is to make the code that NN uses to exit safemode be pluggable.
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