Hi Maxime, Did you start ambari-agent on each node? Ssh to each node as root (probably) or ambari (depending on how you set it up) and run ambari-agent status and/or ambari-agent-start. I'm pretty sure you will see an error if there is no communication with the agents. If an operation failed, you will see a red line. As you drill in, you will probably see a number of green lines, but you need to find the failed ones which are red and drill into them. ... View more

@Maxime Savary - the logs to start each service can be found by looking in Ambari "Ops" button near the top by the "Alerts" button. Drill down to the failed (red) action and eventually you will get to the logs. there are two logs for each operation in this window - stderr and stdout. You don't have to go to the file system. These are the ambari-agent logs for specific operations. The other half of the equation is to look on the server where the service is starting. For example, look at /var/log/hadoop/hdfs/hadoop-hdfs-datanode.log or hadoop-hdfs-namenode.log. These files are going to be on whatever server the service is supposed to run on. Please click Reply rather than entering a new answer when you are replying. ... View more

@Maxime Savary - Once ambari-server is up, and ambari-agent is up on each node, in Ambari s you can stop and start the cluster using the Action button below the list of services. https://docs.hortonworks.com/HDPDocuments/Ambari-2.1.0.0/bk_Ambari_Users_Guide/content/_starting_and_stopping_all_services.html If this does not work, you need to look at the logs. You can post logs here and we will try to help. ... View more

Did you restart all services? If so, you'll need to look at the logs to see what's going on. Start by looking at the logs in Ambari from the start commands for each service. If that doesn't give answers, you may need to look at the logs on one of the data nodes. ... View more

What is your environment? Are you using the HDP Sandbox in VirtualBox? ... View more

@Avijeet Dash - Terry made all good points. Note that using SolrCloud does not require using HDFS. SolrCloud can also use local storage and it is not uncommon. Sometimes people misunderstand when we don't point this out. The optimal choice of HDFS vs local depends on the use case, but local storage is usually preferred over HDFS if your index has a high level of updates/adds. SolrCloud automatically replicates your data and is fault tolerant, but still, SolrCloud has the advantages Terry mentioned. ... View more

Glad you have it worked out. Somehow I missed your last post stating that it is already installed, so my previous comment is OBE. ... View more

Are you also using Ambari 2.4.x? I believe Ambari Infra is shipped wit Ambari 2.4.x, not HDP 2.5. It's sort of like Ambari Metrics is part of Ambari but not directly part of HDP, even though it works with HDP. Assuming you have Ambari 2.4.x, do you don't see "Ambari Infra" when you select Add Service (it does not have the name Solr in it in Ambari)? ... View more

@Sami Ahmad Which version of Ambari are you on? Ambari Infra is only in Ambari 2.4.0 and later. ... View more

A.so, to install the right version of Solr, I'd recommend this page: https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.5.3/bk_security/content/installing_external_solr.html ... View more