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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3283) Need a mechanism for data nodes to update generation stamps.
Date Sat, 19 Apr 2008 00:38:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590655#action_12590655
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-3283:
------------------------------------------------

One way is to an inter-DataNode protocol for block manipulation:
{code}
interface BlockProtocol extends VersionedProtocol {
  /**
   * Update the GenerationStamp of a block.
   * @return true iff update was required and done successfully. 
   */
  public boolean updateGenerationStamp(Block block,
      GenerationStamp generationstamp) throws IOException;

  /**
   * @return the BlockMetaDataInfo of the block. 
   */
  public BlockMetaDataInfo getBlockMetaDataInfo(Block block) throws IOException;
}
{code}

> Need a mechanism for data nodes to update generation stamps.
> ------------------------------------------------------------
>
>                 Key: HADOOP-3283
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3283
>             Project: Hadoop Core
>          Issue Type: New Feature
>            Reporter: Tsz Wo (Nicholas), SZE
>
> For implementing file append feature (HADOOP-1700), a generation stamp is added to each
block.  We need a mechanism for data nodes to update generation stamps for lease recovery.

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