rdblue commented on a change in pull request #111: Split files when planning
scan tasks
URL: https://github.com/apache/incubator-iceberg/pull/111#discussion_r260404631
##########
File path: core/src/main/java/com/netflix/iceberg/BaseTableScan.java
##########
@@ -231,4 +234,69 @@ public String toString() {
.add("filter", rowFilter)
.toString();
}
+
+ private CloseableIterable<FileScanTask> planSplits(long splitSize) {
+ final CloseableIterable<FileScanTask> fileScanTasks = planFiles();
+ final Iterable<FileScanTask> splitTasks = FluentIterable
+ .from(fileScanTasks)
+ .transformAndConcat(input -> getSplits(input, splitSize));
+ // Capture manifests which can be closed after scan planning
+ final CloseableIterable<FileScanTask> closeableSplitTasks =
CloseableIterable
+ .combine(splitTasks, ImmutableList.of(fileScanTasks));
+ return closeableSplitTasks;
+ }
+
+ private static Iterable<FileScanTask> getSplits(FileScanTask fileScanTask,
long splitSize) {
+ return () -> new Iterator<FileScanTask>() {
+ long offset = 0;
+ long remainingLen = fileScanTask.length();
+
+ @Override
+ public boolean hasNext() {
+ return remainingLen > 0;
+ }
+
+ @Override
+ public FileScanTask next() {
+ long len = Math.min(splitSize, remainingLen);
+ final FileScanTask splitTask = splitTask(offset, len, fileScanTask);
+ offset += len;
+ remainingLen -= len;
+ return splitTask;
+ }
+ };
+ }
+
+ /**
+ * Creates a split from a given {@link FileScanTask}.
+ * The split is a {@link FileScanTask} which starts from `offset` and has
length `len`.
+ */
+ private static FileScanTask splitTask(long offset, long len, FileScanTask
fileScanTask) {
Review comment:
I think the suggestion to add a `split` method would solve both problems.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
