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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6097) Multiple bugs w/ Hadoop archives
Date Tue, 01 Sep 2009 05:55:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749774#action_12749774
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Chris Douglas commented on HADOOP-6097:
---------------------------------------

I agree with Vladimir; checking the scheme for "har" and dodging the cache is not a sufficiently
general solution for FileSystem. As in the patch comment, the har filesystem isn't a great
use case to justify a four-level cache, either.

bq. introduce property fs.[fs-name].impl.disable.cache. And don't use cache is this property
exists and set to true

+1 However, I'd suggest that it be part of a separate issue.

> Multiple bugs w/ Hadoop archives
> --------------------------------
>
>                 Key: HADOOP-6097
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6097
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.18.0, 0.18.1, 0.18.2, 0.18.3, 0.19.0, 0.19.1, 0.20.0
>            Reporter: Ben Slusky
>             Fix For: 0.20.1
>
>         Attachments: HADOOP-6097.patch
>
>
> Found and fixed several bugs involving Hadoop archives:
> - In makeQualified(), the sloppy conversion from Path to URI and back mangles the path
if it contains an escape-worthy character.
> - It's possible that fileStatusInIndex() may have to read more than one segment of the
index. The LineReader and count of bytes read need to be reset for each block.
> - har:// connections cannot be indexed by (scheme, authority, username) -- the path is
significant as well. Caching them in this way limits a hadoop client to opening one archive
per filesystem. It seems to be safe not to cache them, since they wrap another connection
that does the actual networking.

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