fhueske commented on a change in pull request #6621: [FLINK-8686] [sql-client]
Limit result size for prototyping modes
URL: https://github.com/apache/flink/pull/6621#discussion_r213014246
##########
File path:
flink-libraries/flink-sql-client/src/main/java/org/apache/flink/table/client/gateway/local/result/MaterializedCollectStreamResult.java
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@@ -112,30 +129,43 @@ else if (!isRetrieving()) {
@Override
protected void processRecord(Tuple2<Boolean, Row> change) {
synchronized (resultLock) {
- final Row row = change.f1;
// insert
if (change.f0) {
- materializedTable.add(row);
- rowPositionCache.put(row,
materializedTable.size() - 1);
+ processInsert(change.f1);
}
// delete
else {
- // delete the newest record first to minimize
per-page changes
- final Integer cachedPos =
rowPositionCache.get(row);
- final int startSearchPos;
- if (cachedPos != null) {
- startSearchPos = Math.min(cachedPos,
materializedTable.size() - 1);
- } else {
- startSearchPos =
materializedTable.size() - 1;
- }
-
- for (int i = startSearchPos; i >= 0; i--) {
- if
(materializedTable.get(i).equals(row)) {
- materializedTable.remove(i);
- rowPositionCache.remove(row);
- break;
- }
- }
+ processDelete(change.f1);
+ }
+ }
+ }
+
+ //
--------------------------------------------------------------------------------------------
+
+ private void processInsert(Row row) {
+ // limit the materialized table
+ if (materializedTable.size() >= maxRowCount) {
+ processDelete(materializedTable.get(0));
Review comment:
Why should we search for the row if we know that we want to remove it from
the first position?
Couldn't we just do `materializedTable.remove(0)`? This will be expensive
because `materializedTable` is an `ArrayList` but what's the chance that there
is another row that is equal to the one that is removed?
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