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documenting problem discovered in issue 157

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jonathan pickett
2014-08-19 13:27:16 -07:00
parent c3358cc869
commit 6f4ce3f83e
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README.md
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@@ -51,4 +51,16 @@ To run the Redis test suite requires some manual work:
## Known issues
None.
Problem:
On versions of Windows prior to Windows 8/Server 2012, when an AOF or RDB operation is complete and the child process is being rejoined with the parent, it is
possible for Redis to unexpectedly terminate.
Cause:
The PAGE_REVERT_TO_FILE_MAP flag is not usable in VirtualProtect() in earlier versions of the OS. This flag allows for removing copy on write(COW) pages from
a memory mapped view without unmapping the view. In prior versions of the OS, the only way to purge COW pages is to unmap and then remap the memory mapped view.
Between the unmapping and remapping operations a third party process(e.g., an anti-virus program) could allocate virtual memory occupied by the memory mapped view.
As this view is used for the Redis heap, failure to remap is a fatal error. (See RejoinCOWPages() in src\Win32_Interop\Win32_QFork.cpp)
Solution:
If you encounter this problem, host Redis on Windows 8/Server 2012 or newer.