I am making use of CephFS plus the cephfs-hadoop shim to replace HDFS in a system I’ve been experimenting with.
I’ve noticed that a large number of my HDFS clients have a ‘num_caps’ value of 16385, as seen when running ‘session ls’ on the active mds. This appears to be one larger than the default value for ‘client_cache_size’ so I presume some relation, though I have not seen any documentation to corroborate this. What I was hoping to do is track down which ceph client is actually holding all these ‘caps’, but since my system can have work scheduled dynamically and multiple clients can be running on the same host, its not obvious how to associate the client ‘id’ as reported by ‘session ls’ with any one process on the give host. Is there steps I can follow to back track the client ‘id’ to a process id? -Chris
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