# MergeException: java.io.FileNotFoundException **URL:** \ **Category:** Elasticsearch\ **Created:** [June 28, 2012, 1:51am UTC](https://discuss.elastic.co/t/mergeexception-java-io-filenotfoundexception/8245 "2012-06-28T01:51:43Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Sebastian\_Gavarini](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@Sebastian\_Gavarini](https://discuss.elastic.co/u/Sebastian_Gavarini)\ **Post date:** [June 28, 2012, 1:51am UTC](https://discuss.elastic.co/t/mergeexception-java-io-filenotfoundexception/8245/1 "2012-06-28T01:51:43Z")
Hello, In the past few days I have seen in two different occasions a MergeException: java.io.FileNotFoundException: \_fg\_1.del details gisted: [https://gist.github.com/3002612](https://gist.github.com/3002612) If you look carefully the date and time of the supposedly FileNotFound is the same as the error log, 2012-06-23 03:19, the mount is configured with noatime, so it's likely the date is the creation date, (ie the file is created at the same time that the check is failing), I guess it could be a concurrency race condition issue. This was seen in two different configurations: ES 0.18.5 jrockit-jdk1.6.0\_26-R28.1.4-4.0.1-linux-x64.bin and ES 0.19.4 jrockit-jdk1.6.0\_31-R28.2.3-4.1.0-linux-x64.bin The HDDs are SSD, and the index that failed aren't exactly heavy loaded (I have other indices with more bulk adds for example). It seems the merge policy thread dies, and a couple of hours later the whole ES server dies with "java.io.IOException: Too many open files". I would appreciate some help and ideas with this. Thanks, Sebastian. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 3:22am UTC](https://discuss.elastic.co/t/mergeexception-java-io-filenotfoundexception/8245/2 "2017-07-06T03:22:18Z")