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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-763) DataBlockScanner reporting of bad blocks is slightly misleading
Date Wed, 11 Nov 2009 07:29:39 GMT
DataBlockScanner reporting of bad blocks is slightly misleading

                 Key: HDFS-763
                 URL: https://issues.apache.org/jira/browse/HDFS-763
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 0.20.1
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur

The Datanode generates a report of the period block scanning that verifies crcs. It reports
something like the following:

Scans since restart : 192266
Scan errors since restart : 33
Transient scan errors : 0

The statement saying that there were 33 errors is slightly midleading because these are not
crc mismatches, rather the block was being deleted when the crc verification was about to

I propose that DataBlockScanner.totalScanErrors is not updated if the dataset.getFile(block)
is null, i.e. the block is now deleted from the datanode. 

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