high disk watermark [90%] exceeded on – How to solve related issues

Opster Team

Feb-21, Version: 1.7-8.0

Crossing high disk watermarks can be avoided if detected earlier. In addition to reading this guide, we strongly recommend you run the Elasticsearch Error Check-Up. We found that 20% of people who ran the Check-Up failed this event. This free tool will detect issues in ES that cause many ES errors and specifically problems that causes disk space to run out quickly and prevent high disk watermark from exceeding.
The tool requires no installation and takes 2 minutes to complete. You can run the Check-Up here.

Log Context

Log “Elasticsearch high disk watermark [90%] exceeded on” classname is DiskThresholdDecider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                     entry; DiskThresholdDecider.this.rerouteInterval);
                if (reroute) {
                    logger.info("high disk watermark exceeded on one or more nodes; rerouting shards");
                    // Execute an empty reroute; but don't block on the response


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