We have been using version 4.10.4 for quite some time and ran into the following issue.
Out of the clear blue, one of our clients sees the exception cited below. We see no prior evidence of anything going awry in our log files. This literally seems to occur out of nowhere. Is there any known issue with the version we are using that might explain this? Is there any way to recover from such a condition short of deleting the entire index? java.lang.RuntimeException: java.io.FileNotFoundException: _27b7u.fnm at org.apache.lucene.index.TieredMergePolicy$SegmentByteSizeDescending.compare(TieredMergePolicy.java:258) at org.apache.lucene.index.TieredMergePolicy$SegmentByteSizeDescending.compare(TieredMergePolicy.java:238) at java.util.TimSort.countRunAndMakeAscending(Unknown Source) at java.util.TimSort.sort(Unknown Source) at java.util.Arrays.sort(Unknown Source) at java.util.ArrayList.sort(Unknown Source) at java.util.Collections.sort(Unknown Source) at org.apache.lucene.index.TieredMergePolicy.findMerges(TieredMergePolicy.java:292) at org.apache.lucene.index.IndexWriter.updatePendingMerges(IndexWriter.java:2020) at org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:1984) at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:441) at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:112) Stuart M Goldberg Senior Vice President of Software Develpment *FIX Flyer LLC* http://www.FIXFlyer.com/ <http://www.fixflyer.com/> NOTICE TO RECIPIENT: THIS E- MAIL IS MEANT ONLY FOR THE INTENDED RECIPIENT(S) OF THE TRANSMISSION, AND CONTAINS CONFIDENTIAL INFORMATION WHICH IS PROPRIETARY TO FIX FLYER LLC ANY UNAUTHORIZED USE, COPYING, DISTRIBUTION, OR DISSEMINATION IS STRICTLY PROHIBITED. ALL RIGHTS TO THIS INFORMATION IS RESERVED BY FIX FLYER LLC. IF YOU ARE NOT THE INTENDED RECIPIENT, PLEASE CONTACT THE SENDER BY REPLY EMAIL AND PLEASE DELETE THIS E-MAIL FROM YOUR SYSTEM AND DESTROY ANY COPIES. -- *Notice to Recipient*: https://www.fixflyer.com/disclaimer <https://www.fixflyer.com/disclaimer>