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Posted to hdfs-dev@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2014/03/24 21:46:48 UTC

[jira] [Created] (HDFS-6151) HDFS should refuse to cache blocks >=2GB

Andrew Wang created HDFS-6151:
---------------------------------

             Summary: HDFS should refuse to cache blocks >=2GB
                 Key: HDFS-6151
                 URL: https://issues.apache.org/jira/browse/HDFS-6151
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: caching, datanode
    Affects Versions: 2.4.0
            Reporter: Andrew Wang
            Assignee: Andrew Wang


If you try to cache a block that's >=2GB, the DN will silently fail to cache it since {{MappedByteBuffer}} uses a signed int to represent size. Blocks this large are rare, but we should log or alert the user somehow.



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