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Description
Alluxio Version:
Alluxio 2.6
Describe the bug
Our extension class loader will load a native shared library (.so) for multiple times.
Failed to load Ceph native library
2021-09-18 15:49:21,444 WARN UnderFileSystem$Factory - Failed to create UnderFileSystem by factory alluxio.underfs.cephfs.CephFSUnderFileSystemFactory@5e2694c1: java.lang.UnsatisfiedLinkError: Native Library /usr/lib64/libcephfs_jni.so.1.0.0 already loaded in another classloader
2021-09-18 15:49:21,444 ERROR FileSystemMasterClientServiceHandler - Exit (Error): Mount: request=alluxioPath: "/fs2"
To Reproduce
Steps to reproduce the behavior (as minimally and precisely as possible)
Expected behavior
An extension class loader will only be loaded once
Urgency
Describe the impact and urgency of the bug.
Additional context
After used #14058 : the native shared lib problem is solved
We test underfs-cephfs and underfs-cephfs-hadoop
[root@s131 /data/alluxio-2.7.0-SNAPSHOT]# bin/alluxio fs mount
cephfs://xx.xx.xx.A:6789/ on /fs2 (cephfs, capacity=711.02TB, used=86.41GB(0%), not read-only, not shared})
cephfs://xx.xx.xx.B:6789/ on /fs3 (cephfs, capacity=24.59TB, used=58.50GB(0%), not read-only, not shared})
ceph://xx.xx.xx.A:6789/ on /fs1 (hdfs, capacity=-1B, used=-1B, read-only, not shared)
ceph://xx.xx.xx.B:6789/ on /fs4 (hdfs, capacity=-1B, used=-1B, read-only, not shared})
/data/alluxio-2.7.0-SNAPSHOT/underFSStorage on / (local, capacity=31.90GB, used=29.72GB(93%), not read-only, not shared, properties={})
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