Analysis of problems in hadoop Cluster with examples

This article introduces the relevant knowledge of "example analysis of hadoop cluster problems". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

1. Delete nodes, delete to 30 blocks and then it will not move

And at this time hadoop dfsadmin -refreshNodes is executed, refreshing nodes does not work either. why？

Number of Under-Replicated Blocks:30

2. Hadoop page status http://XXXX:50070 seems to have a delay in updating. why？

3. When deleting nodes, note the order of deletion when the status changes to Dismissioned.

(My opinion: first remove the datanode, tasktracker, delete the corresponding host in the slaves file, and then edit the excludes file)

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