Cache shows 0% after file is read using fuse client from NFS UFS

[pvaldria]

Alluxio Version:
alluxio-2.6.2]

Describe the bug
After a file is read using fuse client, alluxio shows its not cached.

To Reproduce

`[opc@inst-czyk1-tough-reindeer alluxio-2.6.2]$ time cat /mnt/fuse_client/alluxio-2.6.2-bin.tar.gz > /dev/null

real 22m17.571s
user 0m0.084s
sys 0m1.221s

Waited for 5 mins and then ran the below:

[opc@inst-czyk1-tough-reindeer alluxio-2.6.2]$ ./bin/alluxio fs ls /alluxio-2.6.2-bin.tar.gz
-rw-r--r-- opc opc 1859637604 PERSISTED 10-19-2021 15:59:59:389 0% /alluxio-2.6.2-bin.tar.gz
[opc@inst-czyk1-tough-reindeer alluxio-2.6.2]$`

Expected behavior
Should show cached 100%

Urgency
Unable to use fuse client.

Are you planning to fix it
Please indicate if you are already working on a PR.

Additional context
Add any other context about the problem here.

Did the same using Native Client and it worked.

`[opc@inst-czyk1-tough-reindeer alluxio-2.6.2]$ time ./bin/alluxio fs cat /alluxio-2.6.2-bin.tar.gz > /dev/null

real 0m7.143s
user 0m9.693s
sys 0m1.350s
[opc@inst-czyk1-tough-reindeer alluxio-2.6.2]$ ./bin/alluxio fs ls /alluxio-2.6.2-bin.tar.gz
-rw-r--r-- opc opc 1859637604 PERSISTED 10-19-2021 15:59:59:389 100% /alluxio-2.6.2-bin.tar.gz
[opc@inst-czyk1-tough-reindeer alluxio-2.6.2]$`

[LuQQiu]

@pvaldria how you launch the Alluxio fuse process?
can you share your configuration?

[pvaldria]

[opc@inst-czyk1-tough-reindeer alluxio-2.6.2]$ cat conf/alluxio-site.properties | grep -v "^#"

alluxio.master.hostname=hpc-node-1

alluxio.master.mount.table.root.ufs=/mnt/iad-ad-3-fss

alluxio.user.file.metadata.sync.interval=5

alluxio.fuse.user.group.translation.enabled=true

alluxio.worker.fuse.enabled=true
alluxio.worker.fuse.mount.alluxio.path=/
alluxio.worker.fuse.mount.point=/mnt/fuse_client
alluxio.worker.fuse.mount.options=allow_other,kernel_cache,entry_timeout=7200,attr_timeout=7200

alluxio.fuse.cached.paths.max=500

alluxio.user.metadata.cache.enabled=true
alluxio.user.metadata.cache.max.size=1000000
alluxio.user.metadata.cache.expiration.time=1h

alluxio.user.update.file.accesstime.disabled=true
alluxio.worker.block.master.client.pool.size=1024
alluxio.user.block.master.client.pool.gc.threshold=1h
alluxio.user.block.master.client.pool.size.max=1024
alluxio.user.file.master.client.pool.size.max=1024
alluxio.user.block.worker.client.pool.max=10240

[pvaldria]

I was able to fix the issue by removing all the below settings and restarting Alluxio on all nodes.

Removed:

alluxio.fuse.cached.paths.max=500

alluxio.user.metadata.cache.enabled=true
alluxio.user.metadata.cache.max.size=1000000
alluxio.user.metadata.cache.expiration.time=1h

alluxio.user.update.file.accesstime.disabled=true
alluxio.worker.block.master.client.pool.size=1024
alluxio.user.block.master.client.pool.gc.threshold=1h
alluxio.user.block.master.client.pool.size.max=1024
alluxio.user.file.master.client.pool.size.max=1024
alluxio.user.block.worker.client.pool.max=10240

[github-actions]

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