Thanks again, and please be aware the incorrect text is also found here: https://www.cloudera.com/documentation/enterprise/5-8-x/topics/impala_perf_hdfs_caching.html   "When data is requested to be pinned in memory, that process happens in the background without blocking access to the data while the caching is in progress. Loading the data from disk could take some time. Impala reads each HDFS data block from memory if it has been pinned already, or from disk if it has not been pinned yet. When files are added to a table or partition whose contents are cached, Impala automatically detects those changes and performs a REFRESH automatically once the relevant data is cached."     ... View more

Can someone chime in and say the documentation is wrong please?   The documentation clearly says "When files are added to a table or partition whose contents are cached, Impala automatically detects those changes and performs a REFRESH automatically once the relevant data is cached. "   Are we doing it wrong, or are the Cloudera documents false and misleading?   Thanks. ... View more

Yes, deployed client configurations a few times, shutdown all services on a node, added the HDFS gateway service to all machines, even performed a reboot just in case....   Pretty odd.  The machines still behave as though they are connected fine and are able to interact with HDFS, except for reading files.  This is a dev environment, so we also have security disabled at the moment.    Is there any known issues with installing the j2sdk? I selected Install Oracle Java SE Development Kit (JDK) during the install...   The Host Inspector is happy with the setup.  All services are healthy besides the HDFS canary check (failed to read file.) It is on an affected node.   Also attempted re-run the upgrade wizard, and that results in hosts being stuck at Acquiring installation lock...   Any ideas?    Thanks again.         ... View more

Thanks for the assist! 🙂    The previous version was 4.1.3.   The NameNode is reporting this error - Googling returns nothing helpful, unfortunately.   IPC Server handler 15 on 8020, call org.apache.hadoop.hdfs.protocol.ClientProtocol.getBlockLocations from 192.168.1.69:54475: error: java.lang.NullPointerException java.lang.NullPointerException at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.sortLocatedBlocks(DatanodeManager.java:329) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:1409) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getBlockLocations(NameNodeRpcServer.java:413) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getBlockLocations(ClientNamenodeProtocolServerSideTranslatorPB.java:172) at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:44938) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:453) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1002) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1752) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1748) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1438) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1746)   I'm going over the documents again, I realized the issues around Hive and the metastore, however this is a new experience with regards to this error (I have performed a previous upgrade on a very similar setup with no issues.)     The one aspect that does stand out is all of the datanodes are operating fine, the issue is only seen on some 'helper' nodes that interact with HDFS but do not provide HDFS services.   I've finalized the upgrade, removed old packages, restarted the Cloudera agents, checked for old libraries in use... presumably there has to be something from 4.1.3 mucking up the works here or something missing, what would you speculate?   Your time is valuable and I thank you for sharing with us.  ... View more

Adding a note -    The affected nodes are able to put files into HDFS as well as move files already within HDFS, but cat and get operations fail. ... View more

That explains it, thanks! ... View more