Negative free memory deserialized in memory stats – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8-8.9

Briefly, this error occurs when Elasticsearch attempts to deserialize memory statistics and encounters a negative value for free memory. This is usually due to a bug or an issue with the JVM. To resolve this issue, you can try updating your Elasticsearch and JVM to the latest version. If the problem persists, consider checking your system’s memory allocation and usage. You may need to allocate more memory to Elasticsearch or reduce the memory usage of other processes.

This guide will help you check for common problems that cause the log ” negative free memory [{}] deserialized in memory stats ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: monitor, memory.

Log Context

Log “negative free memory [{}] deserialized in memory stats” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                this.adjustedTotal = total;
            long free = in.readLong();
            assert free >= 0 : "expected free memory to be positive; got: " + free;
            if (free 


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