我在spark（exec引擎）上安装了hive（v2.3.4）。我的外部配置单元表是s3上的Parquet格式，跨越100个分区。以下设置设置为20：

hive.exec.input.listing.max.threads
    mapred.dfsclient.parallelism.max
    mapreduce.input.fileinputformat.list-status.num-threads

运行简单查询：

select * from s.there h_code = 'KGD78' and h_no = '265'

我可以在hiveserver2日志中看到下面的内容（日志持续超过1000行，列出了所有不同的分区）。为什么没有并行地列出文件？仅仅在列表中就需要5分钟以上。

2019-03-29T11:29:26,866  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] compress.CodecPool: Got brand-new decompressor [.snappy]
2019-03-29T11:29:27,283  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:27,797  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:28,374  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:28,919  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:29,483  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:30,003  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:30,518  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:31,001  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:31,549  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:32,048  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:32,574  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:33,130  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:33,639  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:34,189  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:34,743  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:35,208  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:35,701  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:36,183  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:36,662  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:37,154  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1
2019-03-29T11:29:37,645  INFO [3fa82455-7853-4c4b-8964-847c00bec708 HiveServer2-Handler-Pool: Thread-53] mapred.FileInputFormat: Total input files to process : 1

我试过了

hive.exec.input.listing.max.threads
    mapred.dfsclient.parallelism.max
    mapreduce.input.fileinputformat.list-status.num-threads

默认值为1，50…结果仍然相同