steveloughran commented on pull request #2530:
URL: https://github.com/apache/hadoop/pull/2530#issuecomment-742788785


   Matching spark PR is https://github.com/apache/spark/pull/30714
   
   I've now done downstream testing in spark local mode, verifying from the log 
that the attribute was read. 
   
   ```
   2020-12-10 14:56:16,760 [Executor task launch worker for task 3] INFO  
magic.MagicCommitTracker (MagicCommitTracker.java:aboutToComplete(134)) - 
Uncommitted data pending to file 
s3a://stevel-london/cloud-integration/DELAY_LISTING_ME/S3ACommitDataframeSuite/dataframe-committer/committer-magic-parquet/parquet/__magic/job-f718ab6a-27df-40fe-8b25-a8d83cd25dca/tasks/attempt_202012101456156213593579150946569_0005_m_000000_3/__base/year=2017/month=1/part-00000-fe9c22b3-8639-451e-9843-7498f2ea5f41.c000.snappy.parquet;
 commit metadata for 1 parts in 
cloud-integration/DELAY_LISTING_ME/S3ACommitDataframeSuite/dataframe-committer/committer-magic-parquet/parquet/__magic/job-f718ab6a-27df-40fe-8b25-a8d83cd25dca/tasks/attempt_202012101456156213593579150946569_0005_m_000000_3/__base/year=2017/month=1/part-00000-fe9c22b3-8639-451e-9843-7498f2ea5f41.c000.snappy.parquet.pending.
 sixe: 6286 byte(s)
   2020-12-10 14:56:17,513 [Executor task launch worker for task 3] INFO  
s3a.S3ABlockOutputStream (S3ABlockOutputStream.java:close(388)) - File 
cloud-integration/DELAY_LISTING_ME/S3ACommitDataframeSuite/dataframe-committer/committer-magic-parquet/parquet/year=2017/month=1/part-00000-fe9c22b3-8639-451e-9843-7498f2ea5f41.c000.snappy.parquet
 will be visible when the job is committed
   2020-12-10 14:56:17,705 [Executor task launch worker for task 3] DEBUG 
datasources.BasicWriteTaskStatsTracker (Logging.scala:logDebug(61)) - File 
Length statistics for 
s3a://stevel-london/cloud-integration/DELAY_LISTING_ME/S3ACommitDataframeSuite/dataframe-committer/committer-magic-parquet/parquet/__magic/job-f718ab6a-27df-40fe-8b25-a8d83cd25dca/tasks/attempt_202012101456156213593579150946569_0005_m_000000_3/__base/year=2017/month=1/part-00000-fe9c22b3-8639-451e-9843-7498f2ea5f41.c000.snappy.parquet
 retrieved from XAttr: 6286
   ```
   


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