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