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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1520) HDFS 20 append: Lightweight NameNode operations to trigger lease recovery
Date Mon, 29 Nov 2010 21:32:10 GMT
HDFS 20 append: Lightweight NameNode operations to trigger lease recovery
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                 Key: HDFS-1520
                 URL: https://issues.apache.org/jira/browse/HDFS-1520
             Project: Hadoop HDFS
          Issue Type: New Feature
    Affects Versions: 0.20-append
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
             Fix For: 0.20-append


Currently HBase uses append to trigger the close of HLog during Hlog split. Append is a very
expensive operation, which involves not only NameNode operations but creating a writing pipeline.
If one of datanodes on the pipeline has a problem, this recovery may takes minutes. I'd like
implement a lightweight NameNode operation to trigger lease recovery and make HBase to use
this instead.

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