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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1026) Quota checks fail for small files and quotas
Date Mon, 27 Jun 2011 02:15:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13055293#comment-13055293
] 

Eli Collins commented on HDFS-1026:
-----------------------------------

Yes, add a comment in FSDirectory#addBlock and in the code that generates a quota violation
exception LOG.warn that the quota check failed because the quota is smaller than block size
* # replicas.

> Quota checks fail for small files and quotas
> --------------------------------------------
>
>                 Key: HDFS-1026
>                 URL: https://issues.apache.org/jira/browse/HDFS-1026
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation, name-node
>    Affects Versions: 0.20.1, 0.20.2, 0.20.3, 0.21.0, 0.22.0
>            Reporter: Eli Collins
>            Priority: Blocker
>
> If a directory has a quota less than blockSize * numReplicas then you can't add a file
to it, even if the file size is less than the quota. This is because FSDirectory#addBlock
updates the count assuming at least one block is written in full. We don't know how much of
the block will be written when addBlock is called and supporting such small quotas is not
important so perhaps we should document this and log an error message instead of making small
(blockSize * numReplicas) quotas work.
> {code}
> // check quota limits and updated space consumed
> updateCount(inodes, inodes.length-1, 0, fileINode.getPreferredBlockSize()*fileINode.getReplication(),
true);
> {code}
> You can reproduce with the following commands:
> {code}
> $ dd if=/dev/zero of=temp bs=1000 count=64
> $ hadoop fs -mkdir /user/eli/dir
> $ hdfs dfsadmin -setSpaceQuota 191M /user/eli/dir
> $ hadoop fs -put temp /user/eli/dir  # Causes DSQuotaExceededException
> {code}

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