How To Solve Issues Related to Log – Unable to link C library. native methods privset will be disabled.

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Updated: Jan-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Unable to link C library. native methods privset will be disabled.” it’s important to understand common problems related to Elasticsearch concepts: bootstrap, filter. See detailed explanations below complete with common problems, examples and useful tips.

Filter in Elasticsearch


A filter in Elasticsearch is all about applying some conditions inside the query that are used to narrow down the matching result set.

What it is used for

When a query is executed, Elasticsearch by default calculates the relevance score of the matching documents.  But in some conditions it does not require scores to be calculated, for instance if a document falls in the range of two given timestamps. For all these Yes/No criteria, a filter clause is used.

Examples

Return all the results of a given index that falls between a date range:

GET my_index/_search
{
  "query": {
    "bool": {
      "filter": {
        "range": {
          "created_at": {
            "gte": "2020-01-01",
            "lte": "2020-01-10"
          }
        }
      }
    }
  }
}

Notes
  • Queries are used to find out how relevant a document is to a particular query by calculating a score for each document, whereas filters are used to match certain criteria and are cacheable to enable faster execution.
  • Filters do not contribute to scoring and thus are faster to execute.
  • There are major changes introduced in Elasticsearch version 2.x onward related to how query and filters are written and performed internally.

Common Problems
  • The most common problem with filters is incorrect use inside the query. If filters are not used correctly, query performance can be significantly affected. So filters must be used wherever there is scope of not calculating the score. 
  • Another problem often arises when using date range filters, if “now” is used to represent the current time. It has to be noted that “now” is continuously changing the timestamp and thus Elasticsearch cannot use caching of the response since the data set will keep changing.


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 Unable To Link C Library Native Met  

2 Warn Common Jna Unable To Link C Li    


Log Context

Log ”Unable to link C library. native methods (priv_set) will be disabled.” classname is SystemCallFilter.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

         SolarisLibrary lib = null;
        if (Constants.SUN_OS) {
            try {
                lib = (SolarisLibrary) Native.loadLibrary("c"; SolarisLibrary.class);
            } catch (UnsatisfiedLinkError e) {
                logger.warn("unable to link C library. native methods (priv_set) will be disabled."; e);
            }
        }
        libc_solaris = lib;
    }







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