GitHub user andrewor14 opened a pull request:
https://github.com/apache/spark/pull/10973
[SPARK-13071] Coalescing HadoopRDD overwrites existing input metrics
This issue is causing tests to fail consistently in master with Hadoop 2.6
/ 2.7. This is because for Hadoop 2.5+ we overwrite existing values of
`InputMetrics#bytesRead` in each call to `HadoopRDD#compute`. In the case of
coalesce, e.g.
```
sc.textFile(..., 4).coalesce(2).count()
```
we will call `compute` multiple times in the same task, overwriting
`bytesRead` values from previous calls to `compute`.
This was caused by #10835.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/andrewor14/spark fix-input-metrics-coalesce
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10973.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #10973
----
commit c31a41010afd7c5871166a80396ea47901bf5e80
Author: Andrew Or <[email protected]>
Date: 2016-01-29T02:39:24Z
Do not overwrite existing values of InputMetrics#bytesRead
commit c5a97fcf3cc3e827eb9067abdc24d0d7fbe1f76c
Author: Andrew Or <[email protected]>
Date: 2016-01-29T02:40:34Z
Merge branch 'master' of github.com:apache/spark into
fix-input-metrics-coalesce
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