Hello, To fix this issue, I used to stop/start the Flume process on a daily basis. Recently we have migrated from Flume to NiFi; much more stable. Rgds Laurent ... View more

Hello @rbiswas, Sorry for the delay in getting back to you (I was on holidays). Thanks for your answers. Yes we can close the thread. regards Laurent ... View more

Hello @rbiswas, Sorry, I'm a bit confused by your last statement. Could you please confirm that if I define a replication factor of 4, and 4 racks, I will get the following distribution of replicas ? (see diagram below) regards Laurent ... View more

thanks @rbiswas for your answer. My concern is regarding the speed of the replication if, let's say one rack is unavailable during 24 / 48hours for maintenance reasons, and in the meantime HDFS is trying to replicate all then data on the remaining rack, thus might saturate the disk space on this rack ! I can't find any documentation mentionning this " HDFS rebalance speed" . Also it looks to me that, if the number of replica factor is equal to the number of racks, there is no guarantee that there will be a replica spread in each rack. Do you confirm it ? Thanks in advance. rgds Laurent ... View more

Hello, No solution to this issue, except re-installing the cluster! Before doing so, we have renamed the HDFS directories in order to preserve the data. rgds Laurent ... View more

@Artem Ervits The problem is not only visible from my PC, but also from all the Ambari users; it's not related to the browser. When accessing the "Host tab", the Web console log output mentions this error : { "status" : 400, "message" : "The properties [Hosts/rack_i…nts/logging] specified in the request or predicate are not supported for the resource type Host." } ...while trying to issue the following request : http://<ambari_server>:8080/api/v1/clusters/OCP_prod/hosts?fields=Hosts/rack_i%E2%80%A6nts/logging&page_size=25&from=0&sortBy=Hosts/host_name.asc&_=1477464892288%20500>:8080/api/v1/clusters/OCP_prod/hosts?fields=Hosts/rack_i%E2%80%A6nts/logging&page_size=25&from=0&sortBy=Hosts/host_name.asc&_=1477464892288%20500 Is it related to the "rack-aware" configuration of our cluster ?....because if I issue the request : http://:8080/api/v1/clusters/OCP_prod/hosts?fields=Hosts>:8080/api/v1/clusters/OCP_prod/hosts?fields=Hosts ... it works fine. So the hosts are correctly seen in the database. Rgds Laurent ... View more

Venkat, The Ambari agents have also been upgraded. As I said earlier, The hosts table seems Ok, Ambari server is able to manage the hosts (for instance, adding new services) , it's just this Web page which doesn't list the hosts !!? ... View more

Hello @Artem Ervits The hosts are presents in the Host table, and we can definitely see them via a curl command. It looks like the issue resides on the generation of the Web page. No, we didn't execute the reset command. rgds Laurent ... View more