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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3205) FSInputChecker and FSOutputSummer should allow better access to user buffer
Date Tue, 08 Apr 2008 06:15:24 GMT
FSInputChecker and FSOutputSummer should allow better access to user buffer
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                 Key: HADOOP-3205
                 URL: https://issues.apache.org/jira/browse/HADOOP-3205
             Project: Hadoop Core
          Issue Type: Bug
          Components: fs
            Reporter: Raghu Angadi
            Assignee: Raghu Angadi



Implementations of FSInputChecker and FSOutputSummer like DFS do not have access to full user
buffer. At any time DFS can access only up to 512 bytes even though user usually reads with
a much larger buffer (often controlled by io.file.buffer.size). This requires implementations
to double buffer data if an implementation wants to read or write larger chunks of data from
underlying storage.

We could separate changes for FSInputChecker and FSOutputSummer into two separate jiras.



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