Hi @Anlarin ,   It is always suggested to have a homogeneous disk storage across Datanodes. Within datanode, if there are heterogeneous volumes, then when the block replicas are written to new disks on a Round Robin fashion, the disks with less capacity will fill up faster compared to the disks with higher size. If the client is local to Node 2, then it will place the 1st block on that node and it's expected to fill faster.   By choosing "Available Space Policy" the DNs would take into account how much space is available on each volume/disks when deciding where to place a new replica. To achieve writes that are evenly distribution in percentage of capacity on drives, change the choosing policy (dfs.datanode.fsdataset.volume.choosing.policy)to Available Space.   If using Cloudera Manager: Navigate to HDFS > Configuration > DataNode Change DataNode Volume Choosing Policy from Round Robin to Available Space   Click Save Changes Restart the DataNodes   The above property only helps for volumes within Datanode. https://docs.cloudera.com/documentation/enterprise/latest/topics/admin_dn_storage_balancing.html   - Was your question answered? Please take some time to click on “Accept as Solution” below this post. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more

Hi @isoardi ,   Seeing sockets in TIME_WAIT state is normal and is by design when the socket is getting closed. Unless we see tens of thousands of sockets in TIME_WAIT state which would consume the ephemeral ports on the host , these are fine. It would be the CLOSE_WAIT sockets we need check which indicates the application has not called the close() call on the socket.   You can refer the below RedHat documentation for more info on this and ways to close the TW sockets by reusing them.   https://access.redhat.com/solutions/24154     ... View more

Hi @abdebja ,   You can refer the instructions provided in the below Cloudera Article to mitigate this issue.   https://my.cloudera.com/knowledge/tmp-folder-filling-up-frequently-with-hprof-dump-files?id=340673   - Was your question answered? Please take some time to click on “Accept as Solution” below this post. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more

Hi @noekmc , It is recommended to turn off Tuned on RHEL8 as its being used to set the processor c-state and act as a way to control power utilisation. So as far as recommendation goes, it's good to turn it off and the Doc needs to be updated to include RHEL8.   -- Was your question answered? Please take some time to click on “Accept as Solution” below this post. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more

Hi @KCJeffro ,   The best possible way would be to change the log level for the thread 'org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy' to 'ERROR'. Do the following: Navigate to Cloudera Manager > HDFS > Config > search for 'NameNode Logging Advanced Configuration Snippet (Safety Valve) log4j_safety_valve' Add the following property: log4j.logger.org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy=ERROR ... View more