Ceph » CephFS

鹏 张 wrote:

1.on ceph filesystem：mkdir test1 test2
2.touch ./test1/1 ./test1/2
3.ln ./test1/1 ./test2/1
ln ./test1/2 ./test2/2
4.rm -rf ./test1/* . rm -rf ./test2/*
5.restart ceph-mds
6.ceph daemon mds.[node*] perf dump |grep strays

I saw the num_strays is the same of strays_created. But I think the num_strays is zero. when restat mds.It can scan all the stray dir and calculate the num_strays.i think the purge or reintegrated or migrated is not remove the dentry from stray dir map.

I'm not seeing an issue. Can you be more specific about what the problem is? Example commands and output?

Patrick Donnelly wrote:

鹏 张 wrote:

1.on ceph filesystem：mkdir test1 test2
2.touch ./test1/1 ./test1/2
3.ln ./test1/1 ./test2/1
ln ./test1/2 ./test2/2
4.rm -rf ./test1/* . rm -rf ./test2/*
5.restart ceph-mds
6.ceph daemon mds.[node*] perf dump |grep strays

I saw the num_strays is the same of strays_created. But I think the num_strays is zero. when restat mds.It can scan all the stray dir and calculate the num_strays.i think the purge or reintegrated or migrated is not remove the dentry from stray dir map.

I'm not seeing an issue. Can you be more specific about what the problem is? Example commands and output?

Dear patrick:
After that i did more test. i think the stray dentry is stored in omap in object.when restart ceph-mds service,the mds can replay the journal.but the stray dentry from journal not inconsistent with omap. Next attchment is my ceph-mds.log. you can search the add dirfrag i added. when replay journal it can get stray dir from journal.But i did unlink all the file before. I think the dentry in stray dir is null.now it always the dentry added before.
Br

Patrick Donnelly wrote:

鹏 张 wrote:

1.on ceph filesystem：mkdir test1 test2
2.touch ./test1/1 ./test1/2
3.ln ./test1/1 ./test2/1
ln ./test1/2 ./test2/2
4.rm -rf ./test1/* . rm -rf ./test2/*
5.restart ceph-mds
6.ceph daemon mds.[node*] perf dump |grep strays

I saw the num_strays is the same of strays_created. But I think the num_strays is zero. when restat mds.It can scan all the stray dir and calculate the num_strays.i think the purge or reintegrated or migrated is not remove the dentry from stray dir map.

I'm not seeing an issue. Can you be more specific about what the problem is? Example commands and output?

also maybe the problem is the journal repaly.I add some debug message to it. void EMetaBlob::replay(MDSRank mds, LogSegment *logseg, MDSlaveUpdate *slaveup) .
if (!unlinked.empty()) {
for (set<CInode>::iterator p = linked.begin(); p != linked.end(); ++p) {
dout(0) << "dentry is: " << **p << dendl;
unlinked.erase(*p);
}
this code print the unlink dentry.but it can not remove the dentry from dir.the attachment is my new ceph-mds.log.