Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/13382#discussion_r71266677
--- Diff:
core/src/main/scala/org/apache/spark/storage/DiskBlockObjectWriter.scala ---
@@ -27,8 +27,8 @@ import org.apache.spark.util.Utils
/**
* A class for writing JVM objects directly to a file on disk. This class
allows data to be appended
- * to an existing block and can guarantee atomicity in the case of faults
as it allows the caller to
- * revert partial writes.
+ * to an existing block. Callers can write to the same file and commit
these writes.
+ * In case of faults, callers should atomically revert the uncommitted
partial writes.
--- End diff --
Perhaps elaborate a bit more, e.g. "For efficiency, this class retains the
underlying file channel across multiple commits to a file. The channel is kept
open until close() is called on DiskBlockObjectWriter."
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