Bootstrap job via Hudi datasource hangs at the end of the spark-submit job

Bootstrap job via Hudi datasource hangs at the end of the spark-submit job

This issue is similar to https://issues.apache.org/jira/browse/HUDI-1230. Basically, HoodieWriteClient at https://github.com/apache/hudi/blob/release-0.6.0/hudi-spark/src/main/scala/org/apache/hudi/HoodieSparkSqlWriter.scala#L255 will not be closed and as a result, the corresponding timeline server will not stop at the end. Therefore the job hangs and never exits.