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Posted to common-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2009/03/23 06:45:50 UTC
[jira] Created: (HADOOP-5552) HDFS does not support blocks greater
than 2GB
HDFS does not support blocks greater than 2GB
---------------------------------------------
Key: HADOOP-5552
URL: https://issues.apache.org/jira/browse/HADOOP-5552
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Reporter: dhruba borthakur
Assignee: dhruba borthakur
HDFS currently does not support blocks greater than 2GB in size.
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[jira] Commented: (HADOOP-5552) HDFS does not support blocks
greater than 2GB
Posted by "Konstantin Shvachko (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688374#action_12688374 ]
Konstantin Shvachko commented on HADOOP-5552:
---------------------------------------------
Could you please clarify what is the problem with large blocks and how you fix it.
> HDFS does not support blocks greater than 2GB
> ---------------------------------------------
>
> Key: HADOOP-5552
> URL: https://issues.apache.org/jira/browse/HADOOP-5552
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: largeBlockSize1.txt
>
>
> HDFS currently does not support blocks greater than 2GB in size.
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[jira] Commented: (HADOOP-5552) HDFS does not support blocks
greater than 2GB
Posted by "dhruba borthakur (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688380#action_12688380 ]
dhruba borthakur commented on HADOOP-5552:
------------------------------------------
I have not yet found all the problems yet. This is mostly a unit-test to catch this problem. The first of the fixes is a integer-to-long conversion problem:
- int len = Math.min((int) (endOffset - offset),
- bytesPerChecksum*maxChunks);
+ int len = (int)Math.min(endOffset - offset,
+ (long)(bytesPerChecksum*maxChunks));
> HDFS does not support blocks greater than 2GB
> ---------------------------------------------
>
> Key: HADOOP-5552
> URL: https://issues.apache.org/jira/browse/HADOOP-5552
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: largeBlockSize1.txt
>
>
> HDFS currently does not support blocks greater than 2GB in size.
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[jira] Updated: (HADOOP-5552) HDFS does not support blocks greater
than 2GB
Posted by "dhruba borthakur (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
dhruba borthakur updated HADOOP-5552:
-------------------------------------
Attachment: largeBlockSize1.txt
Here is a unit test that demonstrates that bug. Also, a simple fix (this might not be all that is required).
> HDFS does not support blocks greater than 2GB
> ---------------------------------------------
>
> Key: HADOOP-5552
> URL: https://issues.apache.org/jira/browse/HADOOP-5552
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: largeBlockSize1.txt
>
>
> HDFS currently does not support blocks greater than 2GB in size.
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