Starting to track leader shard – How To Solve Related Issues

Starting to track leader shard – How To Solve Related Issues

Opster Team

Jan-20, Version: 1.7-8.0

 

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Starting to track leader shard ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: plugin and shard.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log “{} Starting to track leader shard {}” classname is ShardFollowTasksExecutor.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 
    
Override
    protected void nodeOperation(final AllocatedPersistentTask task; final ShardFollowTask params; final PersistentTaskState state) {
        Client followerClient = wrapClient(client; params.getHeaders());
        ShardFollowNodeTask shardFollowNodeTask = (ShardFollowNodeTask) task;
        logger.info("{} Starting to track leader shard {}"; params.getFollowShardId(); params.getLeaderShardId());

        FollowerStatsInfoHandler handler = (followerHistoryUUID; followerGCP; maxSeqNo) -> {
            shardFollowNodeTask.start(followerHistoryUUID; followerGCP; maxSeqNo; followerGCP; maxSeqNo);
        };
        Consumer errorHandler = e -> {



 

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