How To Solve Issues Related to Log – I/O exception while trying to read

How To Solve Issues Related to Log – I/O exception while trying to read

Updated: Jan-20

Elasticsearch Version: 1.7-8.0


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To troubleshoot log “I/O exception while trying to read” it’s important to understand a few problems related to Elasticsearch concepts bootstrap checks. See bellow important tips and explanations on these concepts

Quick Overview

Elasticsearch reads the value of vm.max_map_count from the file /proc/sys/vm/max_map_count in case of a Linux based operating system. and in rare cases, when this file isn’t present or Elasticsearch isn’t able to read the file, it throws the I/O exception. Fix:  This warning appears in specific and uncommon circumstances, such as when the Elasticsearch process isn’t able to read the file or the file itself isn’t present or has been deleted. In order to fix the issue, ensure the file is present and that the Elasticsearch process has read access. You could also try changing the values slightly using the root use to make sure the file is not corrupt. Please see Elasticsearch source code useful for this.

Log Context

Log”I/O exception while trying to read [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     } 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);
            return -1;

SuppressForbidden(reason = "access /proc/sys/vm/max_map_count")

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Va File I O Why Do I Always Get An  

Elastic Search Is Not Coming Up Due  

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