On Sun, Aug 5, 2018 at 12:44 PM, Yuhao Zhang <zzy...@gmail.com> wrote:
> Hi, > > I am running into a situation that heavy write causes Gluster server went > into zombie with many high CPU processes and all clients hangs, it is > almost 100% reproducible on my machine. Hope someone can help. > Can you give us the output of monitioring these processes with High cpu usage captured in the duration when your tests are running? - MON_INTERVAL=10 # can be increased for very long runs - top -bd $MON_INTERVAL > /tmp/top_proc.${HOSTNAME}.txt # CPU utilization by process - top -bHd $MON_INTERVAL > /tmp/top_thr.${HOSTNAME}.txt # CPU utilization by thread > > I started to observe this issue when running rsync to copy files from > another server and I thought it might be because Gluster doesn't like > rsync's delta transfer with a lot of small writes. However, I was able to > reproduce this with "rsync --whole-file --inplace", or even with cp or scp. > It usually appears after starting the transfer for a few hours, but > sometimes can happen within several minutes. > > Since this is a single node Gluster distributed volume, I tried to > transfer files directly onto the server bypassing Gluster clients, but it > still caused the same issue. > > It is running on top of a ZFS RAIDZ2 dataset. Options are attached. Also, > I attached the statedump generated when my clients hung, and volume options. > > - Ubuntu 16.04 x86_64 / 4.4.0-116-generic > - GlusterFS 3.12.8 > > Thank you, > Yuhao > > > _______________________________________________ > Gluster-users mailing list > Gluster-users@gluster.org > https://lists.gluster.org/mailman/listinfo/gluster-users >
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