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Briefly, this error occurs when OpenSearch attempts to perform a synced flush operation on an index but encounters an issue. This could be due to a variety of reasons such as network issues, disk space problems, or a node being unresponsive. To resolve this, you could try checking the health of your nodes and network, ensuring there’s enough disk space, or manually triggering a flush. If the problem persists, consider checking the OpenSearch logs for more detailed error information.
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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 OpenSearch concepts: indices, flush.
Log Context
Log “{} error while performing synced flush on [{}]; skipping” classname is SyncedFlushService.java.
We extracted the following from OpenSearch 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);
}
