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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-729) fsck option to list only corrupted files
Date Fri, 30 Oct 2009 00:22:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771715#action_12771715
] 

dhruba borthakur commented on HDFS-729:
---------------------------------------

I am planning to follow Raghu's advice and add the following API to the namenode:

{quote}
  /**
   * Returns a list of files that are corrupted.
   * <p>
   * Returns a list of files that have at least one block that has no valid replicas.
   * The returned list has numExpectedFiles files in it. If the number of files
   * returned is smaller than numExpectedFiles, then it implies that no more 
   * corrupted files are available in the system. The startingNumber is the 
   * startingNumber-th corrupted file in the system. 
   * 
   * @param numExpectedFiles the maximum number of files to be returned 
   * @param startingNumber list files starting from startingNumberth to 
   *                       (startingNumber + numExpectedFiles)th in the 
   *                       list of corrupted files
   * @throws AccessControlException if the superuser privilege is violated.
   * @throws IOException if unable to retrieve information of a corrupt file
   */
  public LocatedBlocks[] getCorruptFiles(int numExpectedFiles, int startingNumber) throws
IOException;

{quote}

This will be used by fsck (or any other application) to quickly detect corrupted files.

> fsck option to list only corrupted files
> ----------------------------------------
>
>                 Key: HDFS-729
>                 URL: https://issues.apache.org/jira/browse/HDFS-729
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> An option to fsck to list only corrupted files will be very helpful for frequent monitoring.

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