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 <[email protected] > 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 <http://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$\205\266\4B\16\333n\0\0\0\**0\1\0\0\0\0\0\0\0\0\0\0\** > 7boolean\0\0\7boolean\0\0\**7boolean\1\0\5short\316\30", 284) = 284 > [pid 6065] 13:07:34.807968 write(70, "\0\0\1\30\0:\316O\0\** > theartbeat\0\0\0\5\0*org.**apache.hadoop.mapred.**TaskTrackerStatus\0*org. > **apache.hadoop.mapred.**TaskTrackerStatus.tracker_** > hadoop9.mlan:localhost/127.0.**0.1:52355 <http://127.0.0.1:52355> > \fhadoop9.mlan\0\0\**303\214\0\0\0\0\0\0\0\2\0\0\0\** > 2\213\1\367\373\200\0\214\367\**223\220\0\213\1\341p\220\0\** > 214\341\351\200\0\377\377\213\**6\243\253\200\0\214q\r\33\312\** > 215$\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 <http://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$\205\266\4B\16\333n\0\0\0\**0\1\0\0\0\0\0\0\0\0\0\0\** > 7boolean\0\0\7boolean\0\0\**7boolean\1\0\5short\316\32", 284 <unfinished > ...> > [pid 6065] 13:07:34.814595 <... write resumed> ) = 284 > [pid 6065] 13:07:34.820960 write(70, "\0\0\1\30\0:\316Q\0\** > theartbeat\0\0\0\5\0*org.**apache.hadoop.mapred.**TaskTrackerStatus\0*org. > **apache.hadoop.mapred.**TaskTrackerStatus.tracker_** > hadoop9.mlan:localhost/127.0.**0.1:52355 <http://127.0.0.1:52355> > \fhadoop9.mlan\0\0\**303\214\0\0\0\0\0\0\0\2\0\0\0\** > 2\213\1\367\373\200\0\214\367\**223\220\0\213\1\341p\220\0\** > 214\341\351\200\0\377\377\213\**6\243\253\200\0\214q\r\33\336\** > 215$\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( > >
