Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/1678#discussion_r15682590
--- Diff:
core/src/main/scala/org/apache/spark/storage/BlockObjectWriter.scala ---
@@ -147,28 +147,36 @@ private[spark] class DiskBlockObjectWriter(
override def isOpen: Boolean = objOut != null
- override def commit(): Long = {
+ override def commitAndClose(): Unit = {
if (initialized) {
// NOTE: Because Kryo doesn't flush the underlying stream we
explicitly flush both the
// serializer stream and the lower level stream.
objOut.flush()
bs.flush()
- val prevPos = lastValidPosition
- lastValidPosition = channel.position()
- lastValidPosition - prevPos
- } else {
- // lastValidPosition is zero if stream is uninitialized
- lastValidPosition
+ close()
}
+ finalPosition = file.length()
}
- override def revertPartialWrites() {
- if (initialized) {
- // Discard current writes. We do this by flushing the outstanding
writes and
- // truncate the file to the last valid position.
- objOut.flush()
- bs.flush()
- channel.truncate(lastValidPosition)
+ // Discard current writes. We do this by flushing the outstanding writes
and then
+ // truncating the file to its initial position.
+ override def revertPartialWritesAndClose() {
+ try {
+ if (initialized) {
+ objOut.flush()
+ bs.flush()
+ close()
+ }
+
+ val truncateStream = new FileOutputStream(file, true)
+ try {
+ truncateStream.getChannel.truncate(initialPosition)
+ } finally {
+ truncateStream.close()
+ }
+ } catch {
+ case e: Exception =>
+ logError("Uncaught exception while reverting partial writes to
file " + file, e)
--- End diff --
Closed streams should not inherently throw (since we check `initialized`
before flushing and closing). However, we may be left with leftover data, as
you said. I don't see a way to prevent the possibility of that occurring, but
it should be possible to recover if users only rely on the returned
fileSegment().
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