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/asterisk/records
Brick2:
server2:/bricks/10_megaraid_8_5_14_x_8_6_16_hdd_r1_nolvm_hdd_storage_01/asterisk/records
Brick3:
server1:/bricks/11_megaraid_0_5_4_x_0_6_5_hdd_r1_nolvm_hdd_storage_02/asterisk/records
Brick4:
server2:/bricks/11_megaraid_8_7_15_x_8_8_20_hdd_r1_nolvm_hdd_storage_02/asterisk/records
Brick5:
server1:/bricks/12_megaraid_0_7_6_x_0_13_14_hdd_r1_nolvm_hdd_storage_03/asterisk/records
Brick6:
server2:/bricks/12_megaraid_8_9_19_x_8_13_24_hdd_r1_nolvm_hdd_storage_03/asterisk/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?
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