Details
Major Description
In our spark sql platform, each query use same HiveContext and independent thread, new data will append to tables as new partitions every 30min. After a new partition added to table T, we should call refreshTable to clear T’s cache in cachedDataSourceTables to make the new partition searchable.
For the table have more partitions and files(much bigger than spark.sql.sources.parallelPartitionDiscovery.threshold), a new query of table T will start a job to fetch all FileStatus in listLeafFiles function. Because of the huge number of files, the job will run several seconds, during the time, new queries of table T will also start new jobs to fetch FileStatus because of the function of getCache is not thread safe. Final cause a driver OOM.
