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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1751) Intrinsic limits for HDFS files, directories
Date Mon, 14 Mar 2011 16:26:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006491#comment-13006491
] 

Daryn Sharp commented on HDFS-1751:
-----------------------------------

The following tests that failed are unrelated to this change, and have been failing for at
least a week.

org.apache.hadoop.hdfs.TestFileConcurrentReader.testUnfinishedBlockCRCErrorNormalTransfer
org.apache.hadoop.hdfsproxy.TestAuthorizationFilter.testPathPermit
org.apache.hadoop.hdfsproxy.TestAuthorizationFilter.testPathPermitQualified


The "TestFileConcurrentReader" issue is caused by the build server running out of file descriptors,
and appears to be another long standing failure.

Please approve since the unit test failures appear unrelated.

> Intrinsic limits for HDFS files, directories
> --------------------------------------------
>
>                 Key: HDFS-1751
>                 URL: https://issues.apache.org/jira/browse/HDFS-1751
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node
>    Affects Versions: 0.22.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1751.patch
>
>
> Enforce a configurable limit on:
>   the length of a path component
>   the number of names in a directory
> The intention is to prevent a too-long name or a too-full directory. This is not about
RPC buffers, the length of command lines, etc. There may be good reasons for those kinds of
limits, but that is not the intended scope of this feature. Consequently, a reasonable implementation
might be to extend the existing quota checker so that it faults the creation of a name that
violates the limits. This strategy of faulting new creation evades the problem of existing
names or directories that violate the limits.

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