HeartSaVioR commented on code in PR #38880:
URL: https://github.com/apache/spark/pull/38880#discussion_r1040611003
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sql/core/src/test/scala/org/apache/spark/sql/execution/streaming/state/RocksDBSuite.scala:
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@@ -116,7 +116,9 @@ class RocksDBSuite extends SparkFunSuite {
withDB(remoteDir, conf = conf) { db =>
// Generate versions without cleaning up
for (version <- 1 to 50) {
- db.put(version.toString, version.toString) // update "1" -> "1", "2"
-> "2", ...
Review Comment:
I'm not an expert of RocksDB, but looks like I could explain this according
to the high level architecture.
https://github.com/facebook/rocksdb/wiki/RocksDB-Overview#3-high-level-architecture
During RocksDB.commit(), we write synchronously and flush synchronously,
meaning that we will produce a new SST file for new writes. (As SST file is
immutable, you can't append any new write against existing SST files.)
That said, for each loop, we write a bunch of overwritten keys, and produce
a new SST file containing overwritten keys. L0 allows SST files to have
overlapping key ranges, but it is no longer allowed in upper level, which is
ensured via "compaction".
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