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From Rajesh Balamohan <rajesh.balamo...@gmail.com>
Subject Re: Please help me with heartbeat storm
Date Tue, 28 May 2013 02:44:29 GMT
Default value of CLUSTER_INCREMENT is 100. Math.max(1000* 29/100, 3000) =
3000 always. This is the reason why you are seeing so many heartbeats. *You
might want to set it to 1 or 5.* This would increase the time taken to send
the heartbeat from TT to JT.


~Rajesh.B


On Mon, May 27, 2013 at 2:12 PM, Eremikhin Alexey <a.eremihin@corp.badoo.com
> wrote:

>  Hi!
>
> Tried 5 seconds. Less number of nodes get into storm, but still they do.
> Additionaly update of ntp service helped a little.
>
> Initially almost 50% got into storming each MR job. But after ntp update
> and and increasing heart-beatto 5 seconds level is around 10%.
>
>
> On 26/05/13 10:43, murali adireddy wrote:
>
> Hi ,
>
>  Just try this one.
>
>  in the file "hdfs-site.xml" try to add the below property
> "dfs.heartbeat.interval" and value  in seconds.
>
>  Default value is '3' seconds. In your case increase value.
>
>  <property>
>  <name>dfs.heartbeat.interval</name>
>  <value>3</value>
> </property>
>
>  You can find more properties and default values in the below link.
>
>
> http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml
>
>
>  Please let me know is the above solution worked for you ..?
>
>
>
>
>  On Fri, May 24, 2013 at 6:40 PM, Eremikhin Alexey <
> a.eremihin@corp.badoo.com> wrote:
>
>> Hi all,
>> I have 29 servers hadoop cluster in almost default configuration.
>> After installing Hadoop 1.0.4 I've noticed that JT and some TT waste CPU.
>> I started stracing its behaviour and found that some TT send heartbeats
>> in an unlimited ways.
>> It means hundreds in a second.
>>
>> Daemon restart solves the issue, but even easiest Hive MR returns issue
>> back.
>>
>> Here is the filtered strace of heartbeating process
>>
>> hadoop9.mlan:~$ sudo strace -tt -f -s 10000 -p 6032 2>&1  | grep 6065 |
>> grep write
>>
>>
>> [pid  6065] 13:07:34.801106 write(70,
>> "\0\0\1\30\0:\316N\0\theartbeat\0\0\0\5\0*org.apache.hadoop.mapred.TaskTrackerStatus\0*org.apache.hadoop.mapred.TaskTrackerStatus.tracker_hadoop9.mlan:localhost/
>> 127.0.0.1:52355\fhadoop9.mlan\0\0\303\214\0\0\0\0\0\0\0\2\0\0\0\2\213\1\367\373\200\0\214\367\223\220\0\213\1\341p\220\0\214\341\351\200\0\377\377\213\6\243\253\200\0\214q\r\33\300\215$\205\266\4B\16\333n\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\7boolean\0\0\7boolean\0\0\7boolean\1\0\5short\316\30",
>> 284) = 284
>> [pid  6065] 13:07:34.807968 write(70,
>> "\0\0\1\30\0:\316O\0\theartbeat\0\0\0\5\0*org.apache.hadoop.mapred.TaskTrackerStatus\0*org.apache.hadoop.mapred.TaskTrackerStatus.tracker_hadoop9.mlan:localhost/
>> 127.0.0.1:52355\fhadoop9.mlan\0\0\303\214\0\0\0\0\0\0\0\2\0\0\0\2\213\1\367\373\200\0\214\367\223\220\0\213\1\341p\220\0\214\341\351\200\0\377\377\213\6\243\253\200\0\214q\r\33\312\215$\205\266\4B\16\333n\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\7boolean\0\0\7boolean\0\0\7boolean\1\0\5short\316\31",
>> 284 <unfinished ...>
>> [pid  6065] 13:07:34.808080 <... write resumed> ) = 284
>> [pid  6065] 13:07:34.814473 write(70,
>> "\0\0\1\30\0:\316P\0\theartbeat\0\0\0\5\0*org.apache.hadoop.mapred.TaskTrackerStatus\0*org.apache.hadoop.mapred.TaskTrackerStatus.tracker_hadoop9.mlan:localhost/
>> 127.0.0.1:52355\fhadoop9.mlan\0\0\303\214\0\0\0\0\0\0\0\2\0\0\0\2\213\1\367\373\200\0\214\367\223\220\0\213\1\341p\220\0\214\341\351\200\0\377\377\213\6\243\253\200\0\214q\r\33\336\215$\205\266\4B\16\333n\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\7boolean\0\0\7boolean\0\0\7boolean\1\0\5short\316\32",
>> 284 <unfinished ...>
>> [pid  6065] 13:07:34.814595 <... write resumed> ) = 284
>> [pid  6065] 13:07:34.820960 write(70,
>> "\0\0\1\30\0:\316Q\0\theartbeat\0\0\0\5\0*org.apache.hadoop.mapred.TaskTrackerStatus\0*org.apache.hadoop.mapred.TaskTrackerStatus.tracker_hadoop9.mlan:localhost/
>> 127.0.0.1:52355\fhadoop9.mlan\0\0\303\214\0\0\0\0\0\0\0\2\0\0\0\2\213\1\367\373\200\0\214\367\223\220\0\213\1\341p\220\0\214\341\351\200\0\377\377\213\6\243\253\200\0\214q\r\33\336\215$\205\266\4B\16\333n\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\7boolean\0\0\7boolean\0\0\7boolean\1\0\5short\316\33",
>> 284 <unfinished ...>
>>
>>
>> Please help me to stop this storming 8(
>>
>>
>
>


-- 
~Rajesh.B

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