Cloudera Manager shows "Concerning Health" for Some of the DataNodes on Oracle Big Data Appliance with "The DataNode has xxx,xxx blocks. Warning threshold: 200,000 block(s)." (Doc ID 1668414.1)

Last updated on JULY 01, 2024

Applies to:

Symptoms

Cloudera Manager shows "Concerning Health" for some of the DataNodes in the hdfs service.  Upon further investigation you see messages like:

From Cloudera Manager > Services > hdfs > Under Health Tests for the DataNodes with  "Concerning Health" you see a message indicating that the DataNode contains a number of blocks exceeding the threshold of 200,000 blocks:  For example you will see some thing like:

From Cloudera Manger under Health Tests this looks like:

The following note describes the options for getting the Oracle Big Data Appliance Cluster back in good health. It is a general recommendation for resolving the case of DataNodes with blocks past the "Warning Threshold", except for the  last workaround steps which are only recommended for Clusters where upgrade is imminent and the cluster must get into a "Healthy" state so that the upgrade can proceed.

Cause

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