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From GuoGuo <>
Subject Re:Re: Re: Process hang up during buiding cube on kylin?
Date Mon, 25 Jul 2016 02:08:56 GMT
I checked the link for yarn job tracking page, and I saw one map task and one reduce task,
however they were all in "pending" status. Then I drilled down by click the number, I saw
the item shows "scheduled" in the state column. I  went back to the yarn's job tracking page
and clicked the "logs" link, and the page shows three links:

stderr : Total file length is 2661 bytes.

stdout : Total file length is 0 bytes.

syslog : Total file length is 481344 bytes.

I clicked the stderr link and found nothing wrong, but the syslog link shows the message repeatedly:
2016-07-25 05:46:07,532 INFO [RMCommunicator Allocator]
Ramping down all scheduled reduces:0
2016-07-25 05:46:07,532 INFO [RMCommunicator Allocator]
Going to preempt 3 due to lack of space for maps
2016-07-25 05:46:07,532 INFO [RMCommunicator Allocator]
Recalculating schedule, headroom=<memory:2048, vCores:0>
2016-07-25 05:46:07,532 INFO [RMCommunicator Allocator]
Reduce slow start threshold not met. completedMapsForReduceSlowstart 1 

I am eager to know what should I do to fix it and make the job start to run.

At 2016-07-25 09:30:09, "hongbin ma" <> wrote:

Skipping is normal as it reflects switching from layered cubing to fast cubing.
There's a icon in "Build Cube" step linking to the hadoop job status, you should checkout



Bin Mahone | 马洪宾
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