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Posted to user@spark.apache.org by Sea <26...@qq.com> on 2016/05/30 02:33:01 UTC
回复:答复: G1 GC takes too much time
Yes, It seems like that CMS is better. I have tried G1 as databricks' blog recommended, but it's too slow.
------------------ 原始邮件 ------------------
发件人: "condor join";<sp...@outlook.com>;
发送时间: 2016年5月30日(星期一) 上午10:17
收件人: "Ted Yu"<yu...@gmail.com>;
抄送: "user@spark.apache.org"<us...@spark.apache.org>;
主题: 答复: G1 GC takes too much time
The follwing are the parameters:
-XX:+UseG1GC -XX:+UnlockDiagnostivVMOptions -XX:G1SummarizeConcMark
-XX:InitiatingHeapOccupancyPercent=35
spark.executor.memory=4G
发件人: Ted Yu <yu...@gmail.com>
发送时间: 2016年5月30日 9:47:05
收件人: condor join
抄送: user@spark.apache.org
主题: Re: G1 GC takes too much time
bq. It happens during the Reduce majority.
Did the above refer to reduce operation ?
Can you share your G1GC parameters (and heap size for workers) ?
Thanks
On Sun, May 29, 2016 at 6:15 PM, condor join <sp...@outlook.com> wrote:
Hi, my spark application failed due to take too much time during GC. Looking at the logs I found these things:
1.there are Young GC takes too much time,and not found Full GC happen this;
2.The time takes too much during the object copy;
3.It happened more easily when there were not enough resources;
4.It happens during the Reduce majority.
have anyone met the same question?
thanks
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