cozos edited a comment on issue #25899: [SPARK-29089][SQL] Parallelize blocking FileSystem calls in DataSource#checkAndGlobPathIfNecessary URL: https://github.com/apache/spark/pull/25899#issuecomment-546550712 @steveloughran Sorry for the delay. Been busy past couple weeks. Here are the results for the test with various values threads and threadpool size: ``` _____________________________________________________________________ | Type | s3a conn max | Num Threads| Runtime(seconds)| |====================================================================| | Flat Paths | 40 | 10 | 24.08 | | Flat Paths | 40 | 20 | 12.07 | | Flat Paths | 40 | 40 | 6.63 | | Flat Paths | 40 | 60 | 6.94 | | Flat Paths | 40 | 80 | 6.58 | | Flat Paths | 40 | 100 | 8.24 | | Flat Paths | 40 | 150 | 7.19 | | Flat Paths | 40 | 200 | 6.24 | | Flat Paths | 300 | 10 | 19.39 | | Flat Paths | 300 | 20 | 10.16 | | Flat Paths | 300 | 40 | 6.78 | | Flat Paths | 300 | 60 | 6.34 | | Flat Paths | 300 | 80 | 6.94 | | Flat Paths | 300 | 100 | 5.35 | | Flat Paths | 300 | 150 | 5.96 | | Flat Paths | 300 | 200 | 6.78 | | Glob Paths | 40 | 10 | 37.28 | | Glob Paths | 40 | 20 | 4.74 | | Glob Paths | 40 | 40 | 3.81 | | Glob Paths | 40 | 60 | 4.17 | | Glob Paths | 40 | 80 | 3.41 | | Glob Paths | 40 | 100 | 3.01 | | Glob Paths | 40 | 150 | 3.08 | | Glob Paths | 40 | 200 | 2.63 | | Glob Paths | 300 | 10 | 4.59 | | Glob Paths | 300 | 20 | 3.26 | | Glob Paths | 300 | 40 | 3.46 | | Glob Paths | 300 | 60 | 2.62 | | Glob Paths | 300 | 80 | 2.32 | | Glob Paths | 300 | 100 | 2.45 | | Glob Paths | 300 | 150 | 4.61 | | Glob Paths | 300 | 200 | 2.5 | | Single glob path| 40 | 10 | 44.02 | | Single glob path| 40 | 20 | 38.54 | | Single glob path| 40 | 40 | 33.25 | | Single glob path| 40 | 60 | 34.83 | | Single glob path| 40 | 80 | 36.2 | | Single glob path| 40 | 100 | 34.94 | | Single glob path| 40 | 150 | 46.32 | | Single glob path| 40 | 200 | 35.36 | | Single glob path| 300 | 10 | 31.33 | | Single glob path| 300 | 20 | 35.35 | | Single glob path| 300 | 40 | 36.4 | | Single glob path| 300 | 60 | 34.7 | | Single glob path| 300 | 80 | 35.1 | | Single glob path| 300 | 100 | 33.87 | | Single glob path| 300 | 150 | 35.61 | | Single glob path| 300 | 200 | 37.25 | FileSystem org.apache.hadoop.fs.s3a.S3AFileSystem: 0 bytes read, 0 bytes written, 21232 read ops, 0 large read ops, 0 write ops ```
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