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From Dikang Gu <dikan...@gmail.com>
Subject Bootstrap performance.
Date Tue, 21 Apr 2015 01:08:54 GMT
Hi guys,

We have a 100+ nodes cluster, each node has about 400G data, and is running
on a flash disk. We are running 2.1.2.

When I bring in a new node into the cluster, it introduces significant load
to the cluster. For the new node, the cpu usage is 100%, but disk write io
is only around 50MB/s, while we have 10G network.

Does it sound normal to you?

Here are some iostat and vmstat metrics:
==== iostat ====
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          88.52    3.99    4.11    0.00    0.00    3.38

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sda               1.00         0.00         0.04          0          0
sdb             156.50         0.00        55.62          0        1

==== vmstat =====
138  0      0 86781912 438780 101523368    0    0     0 31893 264496 247316
95  4  1  0  0      2015-04-21 01:04:01 UTC
147  0      0 86562400 438780 101607248    0    0     0 90510 456635 245849
91  5  4  0  0      2015-04-21 01:04:03 UTC
143  0      0 86341168 438780 101692224    0    0     0 32392 284495 273656
92  4  4  0  0      2015-04-21 01:04:05 UTC

Thanks.
-- 
Dikang

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