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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4284) BlockReaderLocal not notified of failed disks
Date Thu, 06 Dec 2012 22:40:35 GMT
Andy Isaacson created HDFS-4284:
-----------------------------------

             Summary: BlockReaderLocal not notified of failed disks
                 Key: HDFS-4284
                 URL: https://issues.apache.org/jira/browse/HDFS-4284
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.0.2-alpha, 3.0.0
            Reporter: Andy Isaacson


When a DN marks a disk as bad, it stops using replicas on that disk.

However a long-running {{BlockReaderLocal}} instance will continue to access replicas on the
failing disk.

Somehow we should let the in-client BlockReaderLocal know that a disk has been marked as bad
so that it can stop reading from the bad disk.

>From HDFS-4239:
bq. To rephrase that, a long running BlockReaderLocal will ride over local DN restarts and
disk "ejections". We had to drain the RS of all its regions in order to stop it from using
the bad disk.



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