Encountered I O error while watching file settings – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch tries to monitor changes in the file settings but encounters an Input/Output (I/O) error. This could be due to issues with file permissions, disk space, or the file system. To resolve this, you can check and adjust the file permissions, ensure there’s enough disk space, or verify the integrity of the file system. Also, check if the file is being used by another process which might be causing a lock, preventing Elasticsearch from accessing it.

This guide will help you check for common problems that cause the log ” encountered I/O error while watching file settings ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: settings.

Log Context

Log “encountered I/O error while watching file settings” classname is AbstractFileWatchingService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        if (watchedFileChanged(path)) {
                    } catch (IOException e) {
                        logger.warn("encountered I/O error while watching file settings"; e);
                } else {