We would discuss about how Spark requires that the HADOOP_CONF_DIR or YARN_CONF_DIR environment variable point to the directory containing the client-side configuration files for the cluster. These configurations are used to write to HDFS and connect to the YARN ResourceManager. If you are using a Cloudera Manager deployment, these variables are configured automatically. If you are using an unmanaged deployment, ensure that you set the variables as described in Running Spark on YARN.If the --go-live parameter is specified, Solr merges the resulting offline index into the live running service. Thus, the Solr service must have read access to the contents of the output directory in order to complete the --go-live step. In an environment with restrictive permissions, such as one with an HDFS umask of 077, the Solr user may not be able to read the contents of the newly created directory. To address this issue, the indexer automatically applies the HDFS ACLs to enable Solr to read the output directory contents. These ACLs are only applied if HDFS ACLs are enabled on the HDFS NameNode. For more information, see HDFS Extended ACLs.
The indexer only makes ACL updates to the output directory and its contents. If the output directory's parent directories do not include the execute permission, the Solr service is not be able to access the output directory. Solr must have execute permissions from standard permissions or ACLs on the parent directories of the output directory.
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