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Briefly, this error occurs when OpenSearch cannot parse the value of the system configuration parameter ‘vm.max_map_count’. This parameter is crucial for OpenSearch as it sets the maximum number of memory map areas a process may have. If it’s not set correctly, OpenSearch may fail to start. To resolve this issue, you can set the ‘vm.max_map_count’ to a higher value. You can do this by running the command ‘sysctl -w vm.max_map_count=262144’ as root. Remember to also update the ‘/etc/sysctl.conf’ file with ‘vm.max_map_count=262144’ to make this change permanent.
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This guide will help you check for common problems that cause the log ” unable to parse vm.max_map_count [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: bootstrap.
Log Context
Log “unable to parse vm.max_map_count [{}]” classname is BootstrapChecks.java.
We extracted the following from OpenSearch 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);
}
