1

I want to get list of all read/write queries that have been made (using dataset API) in the current spark job. For example,

Dataset<Row> readDataFrame = spark.read()
            .format("jdbc")
            .option("url", drivingUrl)
            .option("dbtable", "Select * from A where country_code='US'")
            .option("driver", driver)
            .load();

I expect to capture the query: Select * from A where country_code='US'. I tried using listeners for this so that I can capture this info for any spark-submit job I am running without having to alter the main code itself.

What I tried

  1. QueryExecutionListener
@Override
    public void onSuccess(String funcName, QueryExecution qe, long durationNs) {
        SparkPlan sparkPlan = qe.executedPlan();
        //Tried to search the methods/properties inside it, but couldn't find anything
    }

I tried finding in the SQLMetrics, child spark plans etc, but couldn't get the info I'm searching for.

  1. SparkListenerSQLExecutionStart
@Override
    public void onOtherEvent(SparkListenerEvent event) {
        if (event instanceof SparkListenerSQLExecutionStart) {
            SparkListenerSQLExecutionStart sparkListenerSQLExecutionStart = (SparkListenerSQLExecutionStart) event;
            SparkPlanInfo sparkPlanInfo = sparkListenerSQLExecutionStart.sparkPlanInfo();


            System.out.println(sparkListenerSQLExecutionStart.description());
            System.out.println(sparkListenerSQLExecutionStart.details());
            System.out.println(sparkListenerSQLExecutionStart.physicalPlanDescription());
    }

Here also, these details(and other I looked) didn't had the query info I was looking for.

I believe it's possible to capture this info as I have seen projects like SparkSplineAgent and questions in StackOverflow like this have it, but I haven't been able to figure out how.

Can anyone please help me out here?

Anshul
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1 Answers1

3

After lot of trial and error, I finally found a way to do the above. In the listener that implements QueryExecutionListener, I added

@Override
public void onSuccess(String funcName, QueryExecution qe, long durationNs) {
    LogicalPlan executedPlan = qe.analyzed();

    //maintain a queue to keep track of plans to process
    Queue<LogicalPlan> queue = new LinkedList<>();
    queue.add(executedPlan);

    while (!queue.isEmpty()) {
        //get the first plan from queue
        LogicalPlan curPlan = queue.remove();

        if (curPlan instanceof LogicalRelation) {
            LogicalRelation logicalRelation = (LogicalRelation) curPlan;
            BaseRelation baseRelation = logicalRelation.relation();

            if (baseRelation instanceof JDBCRelation) {
                JDBCRelation jdbcRelation = (JDBCRelation) baseRelation;
                System.out.println(jdbcRelation.jdbcOptions().table());
            }
            System.out.println(logicalRelation.relation());
           
        }

        //add all child plans to the queue
        Iterator<LogicalPlan> childItr = curPlan.children().iterator();
        while (childItr.hasNext()) {
            LogicalPlan logicalPlan = childItr.next();
            queue.add(logicalPlan);
        }
    }
}

This gave me the desired output of

SELECT * from A where country_code='US'
Anshul
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