viirya commented on a change in pull request #33749:
URL: https://github.com/apache/spark/pull/33749#discussion_r690673605
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -1586,6 +1586,21 @@ object SQLConf {
.stringConf
.createWithDefault("lz4")
+ /**
+ * Note: this is defined in `RocksDBConf.FORMAT_VERSION`. These two places
should be updated
+ * together.
+ */
+ val STATE_STORE_ROCKSDB_FORMAT_VERSION =
+ buildConf("spark.sql.streaming.stateStore.rocksdb.formatVersion")
+ .internal()
+ .doc("Set the RocksDB format version. This will be stored in the
checkpoint when starting " +
+ "a streaming query. If this configuration is not set, we will use the
value in the " +
Review comment:
This sounds more like an optional config? If this is an optional config,
seems we don't need to have a default value here.
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/RocksDB.scala
##########
@@ -497,23 +497,38 @@ case class RocksDBConf(
blockSizeKB: Long,
blockCacheSizeMB: Long,
lockAcquireTimeoutMs: Long,
- resetStatsOnLoad : Boolean)
+ resetStatsOnLoad : Boolean,
+ formatVersion: Int)
object RocksDBConf {
/** Common prefix of all confs in SQLConf that affects RocksDB */
val ROCKSDB_CONF_NAME_PREFIX = "spark.sql.streaming.stateStore.rocksdb"
- private case class ConfEntry(name: String, default: String) {
- def fullName: String =
s"$ROCKSDB_CONF_NAME_PREFIX.${name}".toLowerCase(Locale.ROOT)
+ case class ConfEntry(name: String, default: String) {
+ def fullName: String = s"$ROCKSDB_CONF_NAME_PREFIX.${name}"
}
// Configuration that specifies whether to compact the RocksDB data every
time data is committed
- private val COMPACT_ON_COMMIT_CONF = ConfEntry("compactOnCommit", "false")
+ val COMPACT_ON_COMMIT_CONF = ConfEntry("compactOnCommit", "false")
private val PAUSE_BG_WORK_FOR_COMMIT_CONF =
ConfEntry("pauseBackgroundWorkForCommit", "true")
private val BLOCK_SIZE_KB_CONF = ConfEntry("blockSizeKB", "4")
private val BLOCK_CACHE_SIZE_MB_CONF = ConfEntry("blockCacheSizeMB", "8")
- private val LOCK_ACQUIRE_TIMEOUT_MS_CONF = ConfEntry("lockAcquireTimeoutMs",
"60000")
+ val LOCK_ACQUIRE_TIMEOUT_MS_CONF = ConfEntry("lockAcquireTimeoutMs", "60000")
private val RESET_STATS_ON_LOAD = ConfEntry("resetStatsOnLoad", "true")
+ // Configuration to set the RocksDB format version. When upgrading the
RocksDB version in Spark,
+ // it may introduce a new table format version that can not be supported by
an old RocksDB version
+ // used by an old Spark version. Hence, we store the table format version in
the checkpoint when
+ // a query starts, and when restarting a query from a checkpoint, we will
use the format version
+ // in the checkpoint. This will ensure the user can still rollback their
Spark version for an
+ // existing query when RocksDB changes its default table format in a new
version. The user can
Review comment:
Once we use the format version in the checkpoint when restarting a
query, it will just use original format on the RocksDB instead of the new
format, why needing to rollback Spark version?
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