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Bug #7780
closedWhen full flag is set, even MDS writes are blocked
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other
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Severity:
3 - minor
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Affected Versions:
ceph-qa-suite:
Component(FS):
MDS
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Description
We're meant to allow the MDS to write even when the OSDs think they're full, so that we can journal file deletions (OSD.cc:6941). However, we don't get as far as that check because there is a check on the client side (Objecter.cc:1266) that pauses writes when the OSD map has the full flag. The MDS log shows a bunch of "FULL, paused modify" log messages when the filesystem fills up, and all client ops are blocked.
In the absence of anything smarter, I guess we need to add a similar special case to the fullness check in Objecter to allow MDS writes through.
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