How To Solve Issues Related to Log – Unable to retrieve max number of threads

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Updated: Jan-20

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Log Context
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Troubleshooting background

To troubleshoot Elasticsearch log “Unable to retrieve max number of threads” it’s important to understand common problems related to Elasticsearch concepts: bootstrap, threads. See detailed explanations below complete with common problems, examples and useful tips.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 Elasticsearch – Bootstrap checks failing 31.09 K  12

2 Cant Start Fresh Install Of Es 5 0  


Log Context

Log ”Unable to retrieve max number of threads [“ classname is JNANatives.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

 
            final JNACLibrary.Rlimit rlimit = new JNACLibrary.Rlimit();
            if (JNACLibrary.getrlimit(rlimit_nproc; rlimit) == 0) {
                MAX_NUMBER_OF_THREADS = rlimit.rlim_cur.longValue();
            } else {
                logger.warn("unable to retrieve max number of threads [" + JNACLibrary.strerror(Native.getLastError()) + "]");
            }
        }
    }

    static void trySetMaxSizeVirtualMemory() {






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