bbejeck commented on code in PR #23144:
URL: https://github.com/apache/kafka/pull/23144#discussion_r3799271749
##########
streams/src/main/java/org/apache/kafka/streams/state/internals/RocksDBStore.java:
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@@ -1251,6 +1276,23 @@ public void deleteRange(final ColumnFamilyHandle
columnFamily, final byte[] from
buffer.stageDeleteRange(columnFamily, Bytes.wrap(from),
Bytes.wrap(to));
}
+ @Override
+ public void putAll(final ColumnFamilyAccessor cfAccessor,
+ final List<KeyValue<Bytes, byte[]>> entries) {
+ // Batch writes must be staged like single-key puts. If written
directly to RocksDB
+ // (what the direct accessor does), the uncommitted data would sit
in the store rather
+ // than the buffer so would not get removed on error. Staging
under one write-lock
+ // acquisition also hides the batch from a concurrent IQ reader
until complete,
+ // matching the atomicity of the direct accessor's single
db.write(batch). Reusing
+ // cfAccessor.put() keeps the column-family layout — including the
dual-CF upgrade
+ // path — identical to a single-key put.
+ buffer.stageAll(() -> {
+ for (final KeyValue<Bytes, byte[]> entry : entries) {
+ cfAccessor.put(this, entry.key.get(), entry.value);
Review Comment:
@chia7712 - good eye - `updatePosition` stamps the current input record's
(topic, partition, offset) into the position (StoreQueryUtils.java:158-162) —
it doesn't depend on anything per-entry.
Every entry in one putAll is processed under the same record context, so
calling it per-entry is idempotent: the position ends up exactly where a single
update would leave it.
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