Take a look at this article https://community.hortonworks.com/articles/15159/securing-solr-collections-with-ranger-kerberos.html especially the following section -------- Since all Solr data will be stored in the Hadoop Filesystem, it is important to adjust the time Solr will take to shutdown or "kill" the Solr process (whenever you execute "service solr stop/restart"). If this setting is not adjusted, Solr will try to shutdown the Solr process and because it takes a bit more time when using HDFS, Solr will simply kill the process and most of the time lock the Solr Indexes of your collections. If the index of a collection is locked the following exception is shown after the startup routine "org.apache.solr.common.SolrException: Index locked for write" Increase the sleep time from 5 to 30 seconds in /opt/lucidworks-hdpsearch/solr/bin/solr sed -i 's/(sleep 5)/(sleep 30)/g'/opt/lucidworks-hdpsearch/solr/bin/solr -------- You can try the following solution: Make sure nobody is writing to the Solr Index, remove all write.lock files in your HDFS Solr folder (/solr/), Restart Solr. Also make sure the solr user or the user that is running your Solr instance is able to remove the write.lock file.
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