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From "Ivan Veselovsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-3343) IGFS: Do not query secondary file system properties during create/append/mkdirs.
Date Mon, 04 Jul 2016 17:36:10 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15361624#comment-15361624

Ivan Veselovsky commented on IGNITE-3343:

Possibly the following meant: fields  IgfsEntryInfo#props;  IgfsEntryInfo##accessTime , modificationTime
are not used for files in dual paths.
1) create/append/mkdirs: only append makes secondary fs call to get length. Other calls do
the operation directly.
2) info/listFiles : performed directly on secondary fs, the result is not cached.

> IGFS: Do not query secondary file system properties during create/append/mkdirs.
> --------------------------------------------------------------------------------
>                 Key: IGNITE-3343
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3343
>             Project: Ignite
>          Issue Type: Improvement
>          Components: IGFS
>    Affects Versions: 1.6
>            Reporter: Vladimir Ozerov
>            Assignee: Ivan Veselovsky
>            Priority: Critical
>             Fix For: 1.7
> Currently when we create something in a secondary file system, we perform additional
calls to the secondary file system to get file/directory info. This significantly slows down
structural operations, while usually it is not really needed in most cases.
> We should do the following:
> 1) Do not write modification time, access time and properties for DUAL entries. Instead,
we should propagate "info" and "listFiles" calls to secondary file system right away.
> 2) For {{create()}} we do not need length, as the file is either created from scratch,
or truncated.
> 3) For {{append()}} we need to know current length, so the second file system call appears
to be inevitable.

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