GC did bring memory usage down before after allocations duration – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when the Garbage Collector (GC) in OpenSearch is unable to free up enough memory. This could be due to high memory usage by the application or insufficient system memory. To resolve this issue, you can optimize your queries to reduce memory usage, increase the heap size if it’s too small, or add more RAM to your system. Additionally, consider reviewing your data structures and indices to ensure they are efficient and not consuming excessive memory. Regular monitoring of your system’s memory usage can also help prevent such issues.

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This guide will help you check for common problems that cause the log ” GC did bring memory usage down; before [{}]; after [{}]; allocations [{}]; duration [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, memory, breaker.

Log Context

Log “GC did bring memory usage down; before [{}]; after [{}]; allocations [{}]; duration [{}]” classname is HierarchyCircuitBreakerService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :


            final long current = currentMemoryUsageSupplier.getAsLong();
            if (current 


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