Splunk stopped indexing when it sent message in splunkd.log
" WARN DatabaseDirectoryManager - Failed getting size of path='/splunk/splunk/var/lib/splunk/audit/db/hot_v1_592/1470663602-1470663601-4147689500280802279.tsidx.lock':No such file or directory "
What is the problem, and why?
those are the hot buckets of your Splunk instance, see the docs for more details http://docs.splunk.com/Documentation/Splunk/6.4.2/Indexer/HowSplunkstoresindexes#Bucket_names
Check for other errors before this message and check maybe your disk space usage. The is a default limit in server.conf of 5000mb, see docs for more details http://docs.splunk.com/Documentation/Splunk/6.4.2/Admin/Serverconf#Disk_usage_settings_.28for_the_in...
Beside this, it's hard to provide additional help based on the provided information.
Hope this helps ...