Error while performing synced flush on skipping – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch attempts to perform a synced flush operation but fails. This could be due to ongoing indexing operations or other changes in the cluster. To resolve this issue, you can try pausing indexing operations before performing the synced flush. Alternatively, you could increase the timeout period for the synced flush operation. If the error persists, consider checking the health of your cluster and ensure there are no underlying issues causing the failure.

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This guide will help you check for common problems that cause the log ” {} error while performing synced flush on [{}]; skipping ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, flush.

Log Context

Log “{} error while performing synced flush on [{}]; skipping” classname is SyncedFlushService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                            countDownAndSendResponseIfDone(syncId; shards; shardId; totalShards; listener; countDown; results);
                        }

                        @Override
                        public void handleException(TransportException exp) {
                            logger.trace(() -> new ParameterizedMessage("{} error while performing synced flush on [{}]; skipping";
                                shardId; shard); exp);
                            results.put(shard; new ShardSyncedFlushResponse(exp.getMessage()));
                            countDownAndSendResponseIfDone(syncId; shards; shardId; totalShards; listener; countDown; results);
                        }

 

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