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From "Sea" <261810...@qq.com>
Subject 回复:答复: G1 GC takes too much time
Date Mon, 30 May 2016 02:33:01 GMT
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";<spark_kernal@outlook.com>;
发送时间: 2016年5月30日(星期一) 上午10:17
收件人: "Ted Yu"<yuzhihong@gmail.com>; 
抄送: "user@spark.apache.org"<user@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 <yuzhihong@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  <spark_kernal@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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