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List:       ceph-devel
Subject:    [mon]Problem with leveldb in monitor 0.94.5
From:       xiangyang yu <penglaiyxy () gmail ! com>
Date:       2018-02-27 10:51:13
Message-ID: CAE5T3NybhbLSH18d=oeZAvXpxo0OUNu2a_WZG=7E6EY459FqXg () mail ! gmail ! com
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Hi cephers,

Recently I have met a problem with leveldb which is set as monitor
store by default.

My ceph version is 0.94.5.

I have a disk format as xfs,and mount the disk to
/var/lib/ceph/mon/mon.<id>=EF=BC=8C and the size is 100GB.

The monitor store size is increasing 1GB per hours and never seems
compact and my monitor size has ever reached 60GB.

I stop the monitor and backup the monitor data for analysis , and the
size is 23GB.

I find that after manual compact range paxos 10000 20000(in fact , key
paxos 10000 and key paxos 20000 has already been delelted and ceph has
already compact the range paxos 10000 to 20000) After compaction, the
monitor store size is only 489MB.

Actually we can compact the monitor store with ceph tell mon.xxx
compact command, but the monitor size is exploding. and too big, there
must be some problem with levedb or using leveldb in ceph.

Has anyone has ever analysis the monitor store problem with leveldb?

Best regards,
 Brandy
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