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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3205) Read multiple chunks directly from FSInputChecker subclass into user buffers
Date Mon, 09 Nov 2009 22:49:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775179#action_12775179
] 

Todd Lipcon commented on HADOOP-3205:
-------------------------------------

bq. -1 tests included. The patch doesn't appear to include any new or modified tests.

I believe this code path to be well exercised by existing tests (almost all the tests that
do file IO go through this path and exercise it pretty well - note that existing tests failed
when there were bugs in prior versions of the patch)

> Read multiple chunks directly from FSInputChecker subclass into user buffers
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-3205
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3205
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>            Reporter: Raghu Angadi
>            Assignee: Todd Lipcon
>         Attachments: hadoop-3205.txt, hadoop-3205.txt, hadoop-3205.txt, hadoop-3205.txt
>
>
> 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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