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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