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HBase >> mail # user >> GC pause issues


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Varun Sharma 2013-01-24, 17:40
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谢良 2013-01-25, 02:07
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Re: 答复: GC pause issues
I am curious how reducing the memstore size would help - I have 6 regions
and 3G total for memstore - so I would like max out on that by having a
bigger flush size per region. Are you asking me to have more regions and
smaller memstore flush size instead ? How is that likely to help

On Thu, Jan 24, 2013 at 6:07 PM, 谢良 <[EMAIL PROTECTED]> wrote:

> Hi Varun,
>
> Please note if you try to increase new generation size, then the "ParNew"
> time will be up accordingly, and CMS YGC is also a STW.
> could you have a try to reduce memstore size to a smaller value, e.g. 128m
> or 256m ?
>
> Regards,
> Liang
> ________________________________________
> 发件人: Varun Sharma [[EMAIL PROTECTED]]
> 发送时间: 2013年1月25日 1:40
> 收件人: [EMAIL PROTECTED]
> 主题: GC pause issues
>
> Hi,
>
> I have a region server which has the following logs. As you can see from
> the log, ParNew is sufficiently big (450M) and there are heavy writes going
> in. I am seeing 200ms pauses which eventually build up and there is a
> promotion failure. There is a parnew collection every 2-3 seconds so it
> fills up real fast. My memstore size is bigger 512m for flushes and 4
> regions per server. (overall size is 3G for all memstores) - I have mslab
> enabled
>
> 2013-01-24T13:08:16.870+0000: 63533.964: [GC 63533.964: [ParNew:
> 471841K->52416K(471872K), 0.2251880 secs] 8733008K->8445039K(12727104K),
> 0.2254100 secs] [Times: user=0.50 sys=0.18, real=0.22 secs]
> 2013-01-24T13:08:19.546+0000: 63536.639: [GC 63536.639: [ParNew:
> 461593K->52416K(471872K), 0.2812690 secs] 8854216K->8557572K(12727104K),
> 0.2814870 secs] [Times: user=0.66 sys=0.09, real=0.29 secs]
> 013-01-24T13:08:21.824+0000: 63538.917: [GC 63538.918: [ParNew:
> 442836K->52416K(471872K), 0.2781490 secs] 8947992K->8705355K(12727104K),
> 0.2783810 secs] [Times: user=0.58 sys=0.14, real=0.28 secs]
> 2013-01-24T13:08:22.122+0000: 63539.216: [GC [1 CMS-initial-mark:
> 8652939K(12255232K)] 8752914K(12727104K), 0.0365000 secs] [Times: user=0.02
> sys=0.00, real=0.04 secs]
> 2013-01-24T13:08:22.159+0000: 63539.253: [CMS-concurrent-mark-start]
> 2013-01-24T13:08:24.953+0000: 63542.047: [GC 63542.047: [ParNew:
> 471872K->52251K(471872K), 0.1611970 secs] 9124811K->8831437K(12727104K),
> 0.1614180 secs] [Times: user=0.37 sys=0.19, real=0.16 secs]
> 2013-01-24T13:08:26.434+0000: 63543.527: [CMS-concurrent-mark: 4.105/4.268
> secs] [Times: user=5.36 sys=0.34, real=4.27 secs]
> 2013-01-24T13:08:26.434+0000: 63543.527: [CMS-concurrent-preclean-start]
> 2013-01-24T13:08:26.597+0000: 63543.691: [CMS-concurrent-preclean:
> 0.133/0.163 secs] [Times: user=0.16 sys=0.05, real=0.17 secs]
> 2013-01-24T13:08:26.597+0000: 63543.691:
> [CMS-concurrent-abortable-preclean-start]
> 2013-01-24T13:08:27.401+0000: 63544.495:
> [CMS-concurrent-abortable-preclean: 0.792/0.804 secs] [Times: user=1.46
> sys=0.16, real=0.80 secs]
> 2013-01-24T13:08:27.403+0000: 63544.496: [GC[YG occupancy: 274458 K (471872
> K)]63544.496: [Rescan (parallel) , 0.0540730 secs]63544.551: [weak refs
> processing, 0.0001700 secs] [1 CMS-remark: 8779186K(12255232K)]
> 9053645K(12727104K), 0.0544410 secs] [Times: user=0.20 sys=0.01, real=0.06
> secs]
> 2013-01-24T13:08:27.458+0000: 63544.551: [CMS-concurrent-sweep-start]
> 2013-01-24T13:08:27.955+0000: 63545.048: [GC 63545.049: [ParNew:
> 471707K->44566K(471872K), 0.1371770 secs] 9044714K->8701862K(12727104K),
> 0.1374060 secs] [Times: user=0.35 sys=0.12, real=0.14 secs]
> 2013-01-24T13:08:29.285+0000: 63546.378: [GC 63546.478: [ParNew:
> 445714K->52416K(471872K), 0.5626120 secs] 8648805K->8410223K(12727104K),
> 0.5628610 secs] [Times: user=0.91 sys=0.08, real=0.66 secs]
> 2013-01-24T13:08:32.308+0000: 63549.401: [GC 63549.402: [ParNew:
> 471872K->52416K(471872K), 0.2300560 secs] 8247804K->7976043K(12727104K),
> 0.2302900 secs] [Times: user=0.62 sys=0.17, real=0.23 secs]
> 2013-01-24T13:08:34.844+0000: 63551.938: [GC 63551.938: [ParNew (promotion
> failed): 471872K->471872K(471872K), 0.2788500 secs]63552.217:
> [CMS2013-01-24T13:08:37.256+0000: 63554.349: [CMS-concurrent-sweep:
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Varun Sharma 2013-01-25, 05:02
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Jack Levin 2013-01-25, 07:46
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Varun Sharma 2013-01-25, 17:55
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Jack Levin 2013-01-26, 06:54
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varun kumar 2013-01-24, 19:22