After upgrading our environment from 8.1.3 to 8.2.3, some searches return "StatsFileWriterLz4 file open failed". Our environment is one Search Head, one Indexer, one Cluster Master connected in an indexer cluster, with one Heavy forwarder and a few Universal Forwarders. All servers are running on Windows 2019.  A specific error message looks like this: "StatsFileWriterLz4 file open failed file=E:\Splunk\var\run\splunk\srtemp\374915603_1292_at_1637749050.1\statstmp_merged_5.sb.lz4" after running this tstats search: | tstats max(_time) as time max(_indextime) as indextime where index IN ("operations_script_log","telemetry*") sourcetype=* earliest=-30d@d latest=@d by sourcetype host source date_year date_month date_mday date_hour date_minute This search completed and returned the desired results prior to the upgrade, but won't complete after. It runs for about nine seconds before the "StatsFileWriterLz4 file open failed" error message appears and stops the search. Has anybody encountered this problem before and know a solution? ... View more