[Gluster-devel] [Gluster-users] GlusterFS FUSE client hangs on rsyncing lots of file

[Oleksandr Natalenko]

One possible reason:

cluster.lookup-optimize: on
cluster.readdir-optimize: on

I've disabled both optimizations, and at least as of now rsync still does its 
job with no issues. I would like to find out what option causes such a 
behavior and why. Will test more.

On пʼятниця, 15 січня 2016 р. 16:09:51 EET Oleksandr Natalenko wrote:
> Another observation: if rsyncing is resumed after hang, rsync itself
> hangs a lot faster because it does stat of already copied files. So, the
> reason may be not writing itself, but massive stat on GlusterFS volume
> as well.
> 
> 15.01.2016 09:40, Oleksandr Natalenko написав:
> > While doing rsync over millions of files from ordinary partition to
> > GlusterFS volume, just after approx. first 2 million rsync hang
> > happens, and the following info appears in dmesg:
> > 
> > ===
> > [17075038.924481] INFO: task rsync:10310 blocked for more than 120
> > seconds.
> > [17075038.931948] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> > disables this message.
> > [17075038.940748] rsync           D ffff88207fc13680     0 10310
> > 10309 0x00000080
> > [17075038.940752]  ffff8809c578be18 0000000000000086 ffff8809c578bfd8
> > 0000000000013680
> > [17075038.940756]  ffff8809c578bfd8 0000000000013680 ffff880310cbe660
> > ffff881159d16a30
> > [17075038.940759]  ffff881e3aa25800 ffff8809c578be48 ffff881159d16b10
> > ffff88087d553980
> > [17075038.940762] Call Trace:
> > [17075038.940770]  [<ffffffff8160a1d9>] schedule+0x29/0x70
> > [17075038.940797]  [<ffffffffa023a53d>] __fuse_request_send+0x13d/0x2c0
> > [fuse]
> > [17075038.940801]  [<ffffffffa023db30>] ?
> > fuse_get_req_nofail_nopages+0xc0/0x1e0 [fuse]
> > [17075038.940805]  [<ffffffff81098350>] ? wake_up_bit+0x30/0x30
> > [17075038.940809]  [<ffffffffa023a6d2>] fuse_request_send+0x12/0x20
> > [fuse]
> > [17075038.940813]  [<ffffffffa024382f>] fuse_flush+0xff/0x150 [fuse]
> > [17075038.940817]  [<ffffffff811c45c4>] filp_close+0x34/0x80
> > [17075038.940821]  [<ffffffff811e4ed8>] __close_fd+0x78/0xa0
> > [17075038.940824]  [<ffffffff811c6103>] SyS_close+0x23/0x50
> > [17075038.940828]  [<ffffffff81614de9>] system_call_fastpath+0x16/0x1b
> > ===
> > 
> > rsync blocks in D state, and to kill it, I have to do umount --lazy on
> > GlusterFS mountpoint, and then kill corresponding client glusterfs
> > process. Then rsync exits.
> > 
> > Here is GlusterFS volume info:
> > 
> > ===
> > Volume Name: asterisk_records
> > Type: Distributed-Replicate
> > Volume ID: dc1fe561-fa3a-4f2e-8330-ec7e52c75ba4
> > Status: Started
> > Number of Bricks: 3 x 2 = 6
> > Transport-type: tcp
> > Bricks:
> > Brick1:
> > server1:/bricks/10_megaraid_0_3_9_x_0_4_3_hdd_r1_nolvm_hdd_storage_01/aste
> > risk/records Brick2:
> > server2:/bricks/10_megaraid_8_5_14_x_8_6_16_hdd_r1_nolvm_hdd_storage_01/as
> > terisk/records Brick3:
> > server1:/bricks/11_megaraid_0_5_4_x_0_6_5_hdd_r1_nolvm_hdd_storage_02/aste
> > risk/records Brick4:
> > server2:/bricks/11_megaraid_8_7_15_x_8_8_20_hdd_r1_nolvm_hdd_storage_02/as
> > terisk/records Brick5:
> > server1:/bricks/12_megaraid_0_7_6_x_0_13_14_hdd_r1_nolvm_hdd_storage_03/as
> > terisk/records Brick6:
> > server2:/bricks/12_megaraid_8_9_19_x_8_13_24_hdd_r1_nolvm_hdd_storage_03/a
> > sterisk/records Options Reconfigured:
> > cluster.lookup-optimize: on
> > cluster.readdir-optimize: on
> > client.event-threads: 2
> > network.inode-lru-limit: 4096
> > server.event-threads: 4
> > performance.client-io-threads: on
> > storage.linux-aio: on
> > performance.write-behind-window-size: 4194304
> > performance.stat-prefetch: on
> > performance.quick-read: on
> > performance.read-ahead: on
> > performance.flush-behind: on
> > performance.write-behind: on
> > performance.io-thread-count: 2
> > performance.cache-max-file-size: 1048576
> > performance.cache-size: 33554432
> > features.cache-invalidation: on
> > performance.readdir-ahead: on
> > ===
> > 
> > The issue reproduces each time I rsync such an amount of files.
> > 
> > How could I debug this issue better?
> > _______________________________________________
> > Gluster-users mailing list
> > Gluster-users at gluster.org
> > http://www.gluster.org/mailman/listinfo/gluster-users
> 
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