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Add the MIMETYPE_FILE_READ_SIZE setting

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This new setting is used to limit the number of bytes read
while determining the MIME type of a new document. A value
of 0 will cause the entire file to be loaded into memory.
1024 appears to be a suitable number for most cases. This
setting defaults to 0 to preserve the current behavior but
might change in a future version.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>
This commit is contained in:
Roberto Rosario
2019-04-03 22:24:19 -04:00
parent 5f877cdc22
commit a56e3ca111
7 changed files with 85 additions and 4 deletions
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15
docs/releases/3.1.10.rst
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@@ -80,6 +80,21 @@ don't contain at least one version, and don't contain a single page. All these
are requirements for a valid document in Mayan EDMS.
Memory usage
^^^^^^^^^^^^
The MIMETYPE_FILE_READ_SIZE setting was added to limit the number of bytes that
will be read into memory to determine the MIME type of a new document. For
compatibility with the current bevahor this setting defaults to 0 which means
that it is disabled. Disabling the setting will cause the entire document's
file to be loaded into memory. If documents are not processing due to out of
memory errors (large documents or devices with limited memory), set
MIMETYPE_FILE_READ_SIZE to a value other than 0. Limited tests suggest 1024
to be a good alternative as most "magic numbers" used for MIME type detection
are located at the start of the file and just reading the first 1024 bytes will
result in a positive identification with little memory usage.
Other changes
^^^^^^^^^^^^^