Comments (4)
Hmm, if I had to guess, I'd say reiser probably opens the file with the page cache but doesn't fsync on every write (just an uneducated guess, though)
I don't like the idea of explicitly checking for it -- we should actually figure out why we crash. We also shouldn't crash on a bad rethinkdb file in this way (we should give a friendlier error message). I'm moving this issue to backlog because there are more pressing issues at the moment and this seems like a rare configuration. I added #30 for documenting this limitation.
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Here's a related bug in older PostgreSQL version by the way, even though it refers to ext3/4, not ReiserFS.
http://postgresql.1045698.n5.nabble.com/We-really-ought-to-do-something-about-O-DIRECT-and-data-journalled-on-ext4-td3287127.html
It seems that ext3/ext4 do report a failure on opening a file with O_DIRECT in journaled mode though, while ReiserFS seems to accept it and then maybe just misbehaves (whatever that means for semantics so badly defined and/or documented as the direct I/O ones on Linux).
PS: Indeed, on ext4 with data=journal, RethinkDB detects the condition properly and prints the appropriate message, including the text "- the database file is located on a filesystem that doesn't support O_DIRECT open flag (e.g. in case when the filesystem is working in journaled mode)".
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Cool, thanks!
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I don't know if something changed in RehtinkDB, or if this was a a fix in the Ubuntu 10.04 kernel, but it's actually working now. Closing! :-)
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Related Issues (20)
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- Generate web_assets.cc in a repeatable file order HOT 1
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- Why exactly do rethinkDB add null characters to response / request JSON ? HOT 5
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