zhangrenhua commented on a change in pull request #32222:
URL: https://github.com/apache/spark/pull/32222#discussion_r616002502
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala
##########
@@ -301,10 +306,44 @@ private[jdbc] class JDBCRDD(
ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY)
stmt.setFetchSize(options.fetchSize)
stmt.setQueryTimeout(options.queryTimeout)
- rs = stmt.executeQuery()
+
+ val isFinished = new AtomicBoolean(false)
+ startTheJobInterruptListenerThread(context, stmt, isFinished)
+ try{
+ rs = stmt.executeQuery()
+ } finally {
+ isFinished.set(true)
+ }
val rowsIterator = JdbcUtils.resultSetToSparkInternalRows(rs, schema,
inputMetrics)
CompletionIterator[InternalRow, Iterator[InternalRow]](
new InterruptibleIterator(context, rowsIterator), close())
}
+
+ /**
+ * Start the job interruption listener thread, if the job is interrupted and
+ * stmt.executeQuery() is not completed, initiate a stmt.cancel() request.
+ */
+ private def startTheJobInterruptListenerThread(context: TaskContext, stmt:
PreparedStatement
+ , isFinished: AtomicBoolean):
Unit = {
Review comment:
I found that by setting FetchSize, can respond quickly and return the
ResultSet object. If it is mysql database, you need to add the
useCursorFetch=true parameter in the jdbc url. Thank you for your answer, I
will close this pull request.
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