[jira] [Assigned] (IGNITE-3343) IGFS: Do not query secondary file system properties during create/append/mkdirs.

["Ivan Veselovsky (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ivan Veselovsky reassigned IGNITE-3343:
---------------------------------------

    Assignee: Ivan Veselovsky  (was: Vladimir Ozerov)

> 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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