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

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-3343:
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             Summary: 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: Vladimir Ozerov
            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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