Log Unable to parse vm.maxmapcount – How To Solve Related Issues



Log Unable to parse vm.maxmapcount – How To Solve Related Issues

Opster Team

April-20, Version: 1.7-8.0

 

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many log errors (free and no installation required)

 

This guide will help you check for common problems that cause the log “Unable to parse vm.maxmapcount” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: bootstrap checks.


Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations. 

vm.max_map_count is defined as a Long data type in Elasticsearch.  This method in BootstrapChecks.java tries to convert it from String(Read in Sting) to the Long data type. If you define a `vm.max_map_count` which can’t be converted to Long, then Elasticsearch throws NumberFormatException and logs below Error:

 unable to parse vm.max_map_count 

Log Context

Log “Unable to parse vm.max_map_count [{}]” classname is BootstrapChecks.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 final String rawProcSysVmMaxMapCount = readProcSysVmMaxMapCount(bufferedReader);
                if (rawProcSysVmMaxMapCount != null) {
                    try {
                        return parseProcSysVmMaxMapCount(rawProcSysVmMaxMapCount);
                    } catch (final NumberFormatException e) {
                        logger.warn(() -> new ParameterizedMessage("unable to parse vm.max_map_count [{}]"; rawProcSysVmMaxMapCount); e);
                    }
                }
            } catch (final IOException e) {
                logger.warn(() -> new ParameterizedMessage("I/O exception while trying to read [{}]"; path); e);
            }









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