Gluster bricks consuming up to 800% of CPU when 'dict_deln' warnings are posted.

Solution Verified - Updated -

Issue

  • Gluster bricks consuming a high percentage of CPU. From top output:

     PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                                                                               
 22972 root      20   0   21.4g   3.4g   3384 S 878.8  5.4 111353:58 /usr/sbin/glusterfsd -s 192.168.1.1 --volfile-id vol_aaace4b6e98e0a3c2a253a45fafd701a.192.168.1.1.var-lib-heketi-mounts-vg_86e56688599607373553318c6e56d9c7-brick_2+

  • At the same time, inspecting the brick logs at /var/log/glusterfs/bricks/<brick-path>.log, the following messages are observed:

    [2021-10-01 12:27:54.107149] W [dict.c:633:dict_deln] (-->/usr/lib64/glusterfs/6.0/xlator/storage/posix.so(+0x20605) [0x7f4867be0605] -->/usr/lib64/glusterfs/6.0/xlator/storage/posix.so(+0xef57) [0x7f4867bcef57] -->/lib64/libglusterfs.so.0(dict_deln+0x1ae) [0x7f486f5d37ce] ) 142-dict: !this || key=(null) [Invalid argument]

  • How to reduce the CPU usage of the brick?

Environment

  • Red Hat Openshift Container Storage version lower than 3.11.8
  • Red Hat Gluster Storage, version lower than 3.5.5

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