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Posted to hdfs-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2010/11/17 02:09:18 UTC

[jira] Created: (HDFS-1501) The logic that makes namenode exit safemode should be pluggable

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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