dgraph-io / badger / 902
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manishrjain 
Handle mmaping files on Windows

    Handle truncation while mmap-ing (esp. on Windows)

    mmap on Windows works differntly from mmap on Linux.

    * We cannot mmap to a size beyond the size of the file. So we need to
    truncate to that size and then map.

    * We cannot truncate a file while a section of it has been mapped.

    This has implications for how we manage value logs. This change fixes
    mmap-ing on Windows with the following changes:

    * When badger.NewKV() function is called, which in turn calls
    valueLog.Open() method, we don’t immediately mmap the writable log
    files (read-only log files are not a problem). We mmap the writable log
    after replay has happened.

    * Whenever the valueLog.iterate() method is called, and it determines
    that a file needs to be truncated - we need to either make sure that
    there are no open mmaps, or we need to munmap and then re-map the file
    after truncation.

    * Whenever a writable log file is mmap-ed, its size increases to
    ValueLogFileSize * 2 (because of truncation in y.Mmap() function). We
    need to ensure that once it has filled up, it is truncated back to the
    actual size before it is closed and opened as a read-only file. We also
    need to truncate if back if the value log is closed before it fills up.

    * Fix a few tests on AppVeyor that were running out of memory by
    reducing ValueLogFileSize option value.

    Fixes #212.

    * Only truncate if the file isn't mmapped.

    Fix mmap-ing on Windows.

    The previous code we checked in for mmap on Windows was broken. Cleaned
    up the code after looking at the way BoltDB does mmap-ing on Windows.

    The most important thing to note is that in Windows, unlike Linux we
    cannot map beyond the size of the file. So the workaround is to truncate
    the file to a bigger size before mmap-ing it. Special care needs to be
    taken when calling this function, because read-only file descriptors
    cannot be truncated.

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Jobs
ID Job ID Ran Files Coverage
1 902.1 0
78.52
 Travis Job 902.1
2 902.2 0
78.64
 Travis Job 902.2
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