AnsweredAssumed Answered

Blacklistnode

Question asked by dannapureddy on Sep 10, 2014
Latest reply on Jun 23, 2016 by myacoub
some times my data nodes are going to blacklistnodes, Here I analysed the issue and found two reasons for blacklist.

1) Permission Issue.
Some how /tmp/mapr-hadoop/mapred/local directory permissions were changed to root and it's supposed to be mapr ---we fixed this issue.

2) Cache/jvm  issue

we removed the cache files from /tmp/mapr-hadoop/mapred/local & /var/mapr/local/ch2-d014p.net/mapred/taskTracker and fixed the issue.

Here my questions are

1) When this kind of problems will occur with datanode?
 
2) Why MapR is not able to clear cache automatically?

3) Is there any impact on deleting these files from above paths?

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