Hello @Amn_468 Please note that,  you get the block count alert after hitting the warning/critical threshold value set in HDFS Configuration. It is a Monitoring alert and doesn't impact any HDFS operations as such. You may increase the monitoring threshold value in CM ( CM > HDFS > Configurations > DataNode Block Count Thresholds)    However, CM monitors the block counts on the DataNodes is to ensure you are not writing many small files into HDFS. Increase in block counts on DNs is an early warning of small files accumulation in HDFS. The simplest way to check if you are hitting small files issue is to check the average block size of HDFS files.   Fsck should show the average block size. If it's too low a value (eg ~ 1MB), you might be hitting the problems of small files which would be worth looking at, otherwise, there is no need to review the number of blocks.   [..] $ hdfs fsck / .. ... Total blocks (validated): 2899 (avg. block size 11475601 B) <<<<< [..]   Similarly, you can get the average file size in HDFS by running a script as follows: $hdfs dfs -ls -R / | grep -v "^d" |awk '{OFMT="%f"; sum+=$5} END {print "AVG File Size =",sum/NR/1024/1024 " MB"}'   The file size reported by Reports Manager under "HDFS Reports" in Cloudera Manager can be different as the report is extracted from >1hour old FSImage (not a latest one).    Hope this helps.  Any question further, feel free to update the thread. Else mark solved.   Regards, Pabitra Das        ... View more