<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 5, 2018 at 12:44 PM, Yuhao Zhang <span dir="ltr"><<a href="mailto:zzyzxd@gmail.com" target="_blank">zzyzxd@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
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.<br></blockquote><div><br></div><div>Can you give us the output of monitioring these processes with High cpu usage captured in the duration when your tests are running?<br></div><div><br></div><div><li><span style="font-family:terminal,monaco,monospace">MON_INTERVAL=10 # can be increased for very long runs</span></li><li><span style="font-family:terminal,monaco,monospace">top -bd $MON_INTERVAL > /tmp/top_proc.${HOSTNAME}.txt # CPU utilization by process</span></li><li><span style="font-family:terminal,monaco,monospace">top -bHd $MON_INTERVAL > /tmp/top_thr.${HOSTNAME}.txt # CPU utilization by thread</span></li><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
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.<br>
<br>
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.<br>
<br>
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.<br>
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- Ubuntu 16.04 x86_64 / 4.4.0-116-generic<br>
- GlusterFS 3.12.8<br>
<br>
Thank you,<br>
Yuhao<br>
<br>
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