Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/1481#issuecomment-50977756
I hadn't noticed this before, but DiskObjectWriter is used for tracking
bytes spilled by ExternalSorter and ExternalAppendOnlyMap in addition to
shuffle bytes written. So in some cases it needs to bill to
TaskMetrics.diskBytesSpilled as well. Any thoughts on the best way to handle
this? The options as I see it are:
* Pass in TaskMetrics and some flag about which metric to update to
DiskObjectWriter
* Pass in a callback that DiskObjectWriter can notify when it writes bytes
* Pass in a MutableLong
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