The Reports Manager fetches the fsimage from the NameNode at regular intervals. It reads the fsimage and creates a Lucene index for it. To improve the indexing performance, Cloudera recommends provisioning a host as powerful as possible and dedicating an SSD disk to the Reports Manager.
The recommended value is up to four times the current recommendation (4 * FsImage size + 2 Gb). For Example: FsImage size: 20 Gb; Current recommendation in the official documentation: 4 * 20 Gb + 2 Gb = 82 Gb; Recommended value for the increased heap memory needs: x * 82 Gb (1 < x <= 4)
||1 dedicated disk that is at least 20 times the size of the fsimage. Cloudera strongly recommends using SSD disks.|