How To Solve Issues Related to Log – Last_gc duration . collections . total . reclaimed . leaving

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Updated: Feb-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Last_gc duration . collections . total . reclaimed . leaving” it’s important to understand common problems related to Elasticsearch concepts: monitor. 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 :

 

 


Log Context

Log ”[last_gc][{}][{}][{}] duration [{}]; collections [{}]; total [{}]/[{}]; reclaimed [{}]; leaving [{}][{}]/[{}]” classname is JvmMonitorService.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                     // Ignore any duration > 1hr; getLastGcInfo occasionally returns total crap
                    if (lastGc.duration().hoursFrac() > 1) {
                        continue;
                    }
                    if (lastGc.duration().millis() > gcThreshold.warnThreshold) {
                        logger.warn("[last_gc][{}][{}][{}] duration [{}]; collections [{}]; total [{}]/[{}]; reclaimed [{}]; leaving [{}][{}]/[{}]";
                                gc.name(); seq; gc.getCollectionCount(); lastGc.duration(); collections; TimeValue.timeValueMillis(collectionTime); gc.collectionTime(); lastGc.reclaimed(); lastGc.afterUsed(); lastGc.max());
                    } else if (lastGc.duration().millis() > gcThreshold.infoThreshold) {
                        logger.info("[last_gc][{}][{}][{}] duration [{}]; collections [{}]; total [{}]/[{}]; reclaimed [{}]; leaving [{}]/[{}]";
                                gc.name(); seq; gc.getCollectionCount(); lastGc.duration(); collections; TimeValue.timeValueMillis(collectionTime); gc.collectionTime(); lastGc.reclaimed(); lastGc.afterUsed(); lastGc.max());
                    } else if (lastGc.duration().millis() > gcThreshold.debugThreshold && logger.isDebugEnabled()) {






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