xloya commented on code in PR #4427:
URL: https://github.com/apache/iceberg/pull/4427#discussion_r843412283
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core/src/main/java/org/apache/iceberg/util/Tasks.java:
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@@ -212,7 +212,9 @@ public boolean run(Task<I, RuntimeException> task) {
I item = iterator.next();
try {
runTaskWithRetry(task, item);
- succeeded.add(item);
+ if (revertTask != null) {
+ succeeded.add(item);
+ }
Review Comment:
Let me explain why the change is needed here:
At present, when rewriting, it will be rewritten with the `RewriteFileGroup`
as the rewrite unit through the `Tasks` tool class without `revertWith` method:
(https://github.com/apache/iceberg/blob/56d8f07ce6cf7ac99f439848ebf7c8b86f5046df/spark/v3.2/spark/src/main/java/org/apache/iceberg/spark/actions/BaseRewriteDataFilesSparkAction.java#L307-L313)
But at this time, after the rewrite is finished, there is no need to revert
the successful task. As you can see from the following code, unless we call and
set `revertTask`, the logic here will not be executed anyway:
(https://github.com/apache/iceberg/blob/56d8f07ce6cf7ac99f439848ebf7c8b86f5046df/core/src/main/java/org/apache/iceberg/util/Tasks.java#L126-L129)
https://github.com/apache/iceberg/blob/56d8f07ce6cf7ac99f439848ebf7c8b86f5046df/core/src/main/java/org/apache/iceberg/util/Tasks.java#L356-L380
But the current logic is that no matter what, the reference of the
successful task will be saved to the concurrent queue of succeeded, and the
`RewriteFileGroup` that has been rewritten will also be saved. If we want to
release the memory of `RewriteFileGroup`, then we should also remove
unnecessary references to it here
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