Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16844#discussion_r100473254
--- Diff:
core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java ---
@@ -695,11 +690,16 @@ public boolean append(Object kbase, long koff, int
klen, Object vbase, long voff
assert (vlen % 8 == 0);
assert (longArray != null);
- if (numKeys == MAX_CAPACITY
- // The map could be reused from last spill (because of no enough
memory to grow),
- // then we don't try to grow again if hit the `growthThreshold`.
- || !canGrowArray && numKeys > growthThreshold) {
- return false;
+ if (numKeys >= growthThreshold) {
+ if (longArray.size() / 2 == MAX_CAPACITY) {
--- End diff --
@davies is correct; but it is a slightly unintuitive way to write the
condition.
```
val currentSize = longArray.size()
val newSize = currentSize * 2
val currentKeysLen = currentSize / 2
val newKeysLen = currentKeysLen * 2
if (newKeysLen > MAX_CAPACITY) then fail.
that is if (currentKeysLen == MAX_CAPACITY) then fail // Since we allow
only power of 2's for all these values.
that is if (longArray.size() / 2 == MAX_CAPACITY)
```
Particularly given its location (in append as opposed to grow), it serves
to be a bit more confusing that expected.
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