This may happen due to following reasons:
1. Wrong DNS Entry, Hosts file entries,
Description:
Nodes are not able to communicate with each other, so check if nodes where this error comes you can ping or nslookup to that node
2. Tasktracker http thread
Description:
Check of the value of this tag in mapreduce-site.xml, if it is lower make it somewhat higer around 100.
1. Wrong DNS Entry, Hosts file entries,
Description:
Nodes are not able to communicate with each other, so check if nodes where this error comes you can ping or nslookup to that node
2. Tasktracker http thread
Description:
Check of the value of this tag in mapreduce-site.xml, if it is lower make it somewhat higer around 100.
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