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From "Uma Maheswara Rao G (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3085) Local data node may need to reconsider for read, while reading a very big file as it may get recover in some time.
Date Tue, 13 Mar 2012 18:34:42 GMT
Local data node may need to reconsider for read, while reading a very big file as it may get
recover in some time.
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                 Key: HDFS-3085
                 URL: https://issues.apache.org/jira/browse/HDFS-3085
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node, hdfs client
    Affects Versions: 0.24.0
            Reporter: Uma Maheswara Rao G


While reading the file, we will add the DN to deadNodes list and will skip from reads.
If we are reading very huge file (may take hours), and failed read from local datanode, then
this will be added to deadnode list and will be excluded for the further reads for that file.
If the local node recovered immediately,but that will not used for further read. Read may
continue with the remote nodes. It will effect the read performance.

It will be good if we reconsider the local node after certain period based on some factors.

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