Github user sihuazhou commented on a diff in the pull request:
https://github.com/apache/flink/pull/5582#discussion_r191453657
--- Diff:
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeySerializationUtils.java
---
@@ -138,4 +138,12 @@ private static void writeVariableIntBytes(
value >>>= 8;
} while (value != 0);
}
+
+ public static byte[] serializeKeyGroup(int keyGroup, int
keyGroupPrefixBytes) {
+ byte[] startKeyGroupPrefixBytes = new byte[keyGroupPrefixBytes];
--- End diff --
Some info about the experiment I did:
- I set `ReadOptions::ignore_range_deletions = true` to speed up the read
performance, because we won't read any records that belong to the key-group we
have deleted.
- I only call the `deleteRange()` twice, because we will at most call it
twice in the recovery of the incremental checkpoint.
---
