[Spark] Clean up log keys (#3802)

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#### Which Delta project/connector is this regarding?
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- [x] Spark
- [ ] Standalone
- [ ] Flink
- [ ] Kernel
- [ ] Other (fill in here)

## Description

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- Describe what this PR changes.
- Describe why we need the change.
 
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Rename a few log keys to make the intention more clear. Also remove
unused log keys.
## How was this patch tested?

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Existing tests.
## Does this PR introduce _any_ user-facing changes?

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No

spark/src/main/scala/org/apache/spark/sql/delta/FileMetadataMaterializationTracker.scala

@@ -208,7 +208,7 @@ object FileMetadataMaterializationTracker extends DeltaLogging {
       new FileMetadataMaterializationTracker()
     } else {
       logInfo(log"File metadata materialization tracking is disabled for this query." +
-        log" Please set ${MDC(DeltaLogKeys.CONFIG,
+        log" Please set ${MDC(DeltaLogKeys.CONFIG_KEY,
           DeltaSQLConf.DELTA_COMMAND_FILE_MATERIALIZATION_TRACKING_ENABLED.key)} " +
         log"to true to enable it.")
       noopTracker

spark/src/main/scala/org/apache/spark/sql/delta/OptimisticTransaction.scala

@@ -2468,7 +2468,7 @@ trait OptimisticTransactionImpl extends TransactionalWrite
       assert(mismatch.isEmpty,
         s"Expected ${mismatch.map(_._1).mkString(",")} but got ${mismatch.map(_._2).mkString(",")}")
 
-      val logPrefix = log"[attempt ${MDC(DeltaLogKeys.ATTEMPT, attemptNumber)}] "
+      val logPrefix = log"[attempt ${MDC(DeltaLogKeys.NUM_ATTEMPT, attemptNumber)}] "
       val txnDetailsLog = {
         var adds = 0L
         var removes = 0L

spark/src/main/scala/org/apache/spark/sql/delta/SnapshotManagement.scala

@@ -910,7 +910,7 @@ trait SnapshotManagement { self: DeltaLog =>
             firstError = e
           }
           logWarning(log"Failed to create a snapshot from log segment " +
-            log"${MDC(DeltaLogKeys.SEGMENT, segment)}. Trying a different checkpoint.", e)
+            log"${MDC(DeltaLogKeys.LOG_SEGMENT, segment)}. Trying a different checkpoint.", e)
           segment = getLogSegmentWithMaxExclusiveCheckpointVersion(
             segment.version,
             segment.checkpointProvider.version,
@@ -922,7 +922,7 @@ trait SnapshotManagement { self: DeltaLog =>
           attempt += 1
         case e: SparkException if firstError != null =>
           logWarning(log"Failed to create a snapshot from log segment " +
-            log"${MDC(DeltaLogKeys.SEGMENT, segment)}", e)
+            log"${MDC(DeltaLogKeys.LOG_SEGMENT, segment)}", e)
           throw firstError
       }
     }

spark/src/main/scala/org/apache/spark/sql/delta/commands/CloneTableCommand.scala

@@ -92,7 +92,7 @@ case class CloneTableCommand(
     }
 
     /** Log clone command information */
-    logInfo(log"Cloning ${MDC(DeltaLogKeys.TABLE_DESC, sourceTable.description)} to " +
+    logInfo(log"Cloning ${MDC(DeltaLogKeys.CLONE_SOURCE_DESC, sourceTable.description)} to " +
       log"${MDC(DeltaLogKeys.PATH, targetPath)}")
 
     // scalastyle:off deltahadoopconfiguration

spark/src/main/scala/org/apache/spark/sql/delta/commands/ConvertToDeltaCommand.scala

@@ -310,7 +310,7 @@ abstract class ConvertToDeltaCommandBase(
         numFiles += statsBatchSize
         performStatsCollection(spark, txn, adds)
       } else if (collectStats) {
-        logWarning(log"collectStats is set to true but ${MDC(DeltaLogKeys.CONFIG,
+        logWarning(log"collectStats is set to true but ${MDC(DeltaLogKeys.CONFIG_KEY,
           DeltaSQLConf.DELTA_COLLECT_STATS.key)}" +
           log" is false. Skip statistics collection")
         adds.toIterator

spark/src/main/scala/org/apache/spark/sql/delta/commands/ReorgTableForUpgradeUniformHelper.scala

@@ -114,7 +114,7 @@ trait ReorgTableForUpgradeUniformHelper extends DeltaLogging {
       log"at version ${MDC(DeltaLogKeys.VERSION, snapshot.version)}, there are " +
       log"${MDC(DeltaLogKeys.NUM_FILES, numOfAddFiles)} addFiles, and " +
       log"${MDC(DeltaLogKeys.NUM_FILES2, numOfAddFilesWithTag)} addFiles with " +
-      log"ICEBERG_COMPAT_VERSION=${MDC(DeltaLogKeys.TAG, icebergCompatVersion)} tag.")
+      log"ICEBERG_COMPAT_VERSION=${MDC(DeltaLogKeys.VERSION2, icebergCompatVersion)} tag.")
     (numOfAddFiles, numOfAddFilesWithTag)
   }
 

spark/src/main/scala/org/apache/spark/sql/delta/commands/VacuumCommand.scala

@@ -238,7 +238,7 @@ object VacuumCommand extends VacuumCommandImpl with Serializable {
         case _ => snapshot.minFileRetentionTimestamp
       }
       logInfo(log"Starting garbage collection (dryRun = " +
-        log"${MDC(DeltaLogKeys.DRY_RUN, dryRun)}) of untracked " +
+        log"${MDC(DeltaLogKeys.IS_DRY_RUN, dryRun)}) of untracked " +
         log"files older than ${MDC(DeltaLogKeys.DATE,
           new Date(deleteBeforeTimestamp).toGMTString)} in " +
         log"${MDC(DeltaLogKeys.PATH, path)}")

spark/src/main/scala/org/apache/spark/sql/delta/commands/merge/MergeIntoMaterializeSource.scala

@@ -113,16 +113,16 @@ trait MergeIntoMaterializeSource extends DeltaLogging with DeltaSparkPlanUtils {
           handleExceptionDuringAttempt(ex, isLastAttempt, deltaLog) match {
             case RetryHandling.Retry =>
               logInfo(log"Retrying MERGE with materialized source. Attempt " +
-                log"${MDC(DeltaLogKeys.ATTEMPT, attempt)} failed.")
+                log"${MDC(DeltaLogKeys.NUM_ATTEMPT, attempt)} failed.")
               doRetry = true
               attempt += 1
             case RetryHandling.ExhaustedRetries =>
-              logError(log"Exhausted retries after ${MDC(DeltaLogKeys.ATTEMPT, attempt)}" +
+              logError(log"Exhausted retries after ${MDC(DeltaLogKeys.NUM_ATTEMPT, attempt)}" +
                 log" attempts in MERGE with materialized source. Logging latest exception.", ex)
               throw DeltaErrors.sourceMaterializationFailedRepeatedlyInMerge
             case RetryHandling.RethrowException =>
               logError(log"Fatal error in MERGE with materialized source in " +
-                log"attempt ${MDC(DeltaLogKeys.ATTEMPT, attempt)}", ex)
+                log"attempt ${MDC(DeltaLogKeys.NUM_ATTEMPT, attempt)}", ex)
               throw ex
           }
       } finally {

spark/src/main/scala/org/apache/spark/sql/delta/logging/DeltaLogKeys.scala

@@ -46,87 +46,74 @@ import org.apache.spark.internal.LogKeyShims
  */
 trait DeltaLogKeysBase {
   case object APP_ID extends LogKeyShims
-  case object ATTEMPT extends LogKeyShims
   case object BATCH_ID extends LogKeyShims
   case object BATCH_SIZE extends LogKeyShims
-  case object CATALOG extends LogKeyShims
-  case object CLASS_NAME extends LogKeyShims
-  case object COLUMN_NAME extends LogKeyShims
-  case object COMPACTION_INFO_NEW extends LogKeyShims
-  case object COMPACTION_INFO_OLD extends LogKeyShims
+  case object CLONE_SOURCE_DESC extends LogKeyShims
   case object CONFIG extends LogKeyShims
+  case object CONFIG_KEY extends LogKeyShims
   case object COORDINATOR_CONF extends LogKeyShims
   case object COORDINATOR_NAME extends LogKeyShims
   case object COUNT extends LogKeyShims
   case object DATA_FILTER extends LogKeyShims
   case object DATE extends LogKeyShims
   case object DIR extends LogKeyShims
-  case object DRY_RUN extends LogKeyShims
   case object DURATION extends LogKeyShims
   case object END_INDEX extends LogKeyShims
   case object END_OFFSET extends LogKeyShims
   case object END_VERSION extends LogKeyShims
   case object ERROR extends LogKeyShims
   case object EXECUTOR_ID extends LogKeyShims
   case object EXPR extends LogKeyShims
-  case object FILE_ACTION_NEW extends LogKeyShims
-  case object FILE_ACTION_OLD extends LogKeyShims
   case object FILE_INDEX extends LogKeyShims
   case object FILE_NAME extends LogKeyShims
   case object FILE_STATUS extends LogKeyShims
   case object FILE_SYSTEM_SCHEME extends LogKeyShims
   case object FILTER extends LogKeyShims
   case object HOOK_NAME extends LogKeyShims
-  case object INDEX extends LogKeyShims
   case object ISOLATION_LEVEL extends LogKeyShims
+  case object IS_DRY_RUN extends LogKeyShims
   case object IS_INIT_SNAPSHOT extends LogKeyShims
   case object IS_PATH_TABLE extends LogKeyShims
   case object JOB_ID extends LogKeyShims
+  case object LOG_SEGMENT extends LogKeyShims
   case object MAX_SIZE extends LogKeyShims
-  case object MESSAGE extends LogKeyShims
   case object METADATA_ID extends LogKeyShims
   case object METADATA_NEW extends LogKeyShims
   case object METADATA_OLD extends LogKeyShims
   case object METRICS extends LogKeyShims
   case object MIN_SIZE extends LogKeyShims
   case object NUM_ACTIONS extends LogKeyShims
   case object NUM_ACTIONS2 extends LogKeyShims
+  case object NUM_ATTEMPT extends LogKeyShims
   case object NUM_BYTES extends LogKeyShims
   case object NUM_DIRS extends LogKeyShims
   case object NUM_FILES extends LogKeyShims
   case object NUM_FILES2 extends LogKeyShims
   case object NUM_PARTITIONS extends LogKeyShims
   case object NUM_PREDICATES extends LogKeyShims
   case object NUM_RECORDS extends LogKeyShims
-  case object NUM_RECORDS_ACTUAL extends LogKeyShims
-  case object NUM_RECORDS_EXPECTED extends LogKeyShims
   case object NUM_SKIPPED extends LogKeyShims
   case object OFFSET extends LogKeyShims
   case object OPERATION extends LogKeyShims
-  case object OPERATION2 extends LogKeyShims
   case object OP_NAME extends LogKeyShims
-  case object OP_TYPE extends LogKeyShims
   case object PARTITION_FILTER extends LogKeyShims
   case object PATH extends LogKeyShims
   case object PATH2 extends LogKeyShims
   case object PATHS extends LogKeyShims
   case object PROTOCOL extends LogKeyShims
   case object QUERY_ID extends LogKeyShims
-  case object RDD_ID extends LogKeyShims
   case object SCHEMA extends LogKeyShims
   case object SCHEMA_DIFF extends LogKeyShims
-  case object SEGMENT extends LogKeyShims
-  case object SIZE extends LogKeyShims
   case object SNAPSHOT extends LogKeyShims
   case object START_INDEX extends LogKeyShims
   case object START_VERSION extends LogKeyShims
   case object STATS extends LogKeyShims
   case object STATUS extends LogKeyShims
-  case object TABLE_DESC extends LogKeyShims
+  case object STATUS_MESSAGE extends LogKeyShims
+  case object SYSTEM_CLASS_NAME extends LogKeyShims
   case object TABLE_FEATURES extends LogKeyShims
   case object TABLE_ID extends LogKeyShims
   case object TABLE_NAME extends LogKeyShims
-  case object TAG extends LogKeyShims
   case object TBL_PROPERTIES extends LogKeyShims
   case object THREAD_NAME extends LogKeyShims
   case object TIMESTAMP extends LogKeyShims

spark/src/main/scala/org/apache/spark/sql/delta/storage/DelegatingLogStore.scala

@@ -74,7 +74,7 @@ class DelegatingLogStore(hadoopConf: Configuration)
               case lsa: LogStoreAdaptor => s"LogStoreAdapter(${lsa.logStoreImpl.getClass.getName})"
               case _ => logStore.getClass.getName
             }
-            logInfo(log"LogStore ${MDC(DeltaLogKeys.CLASS_NAME, actualLogStoreClassName)} " +
+            logInfo(log"LogStore ${MDC(DeltaLogKeys.SYSTEM_CLASS_NAME, actualLogStoreClassName)} " +
               log"is used for scheme ${MDC(DeltaLogKeys.FILE_SYSTEM_SCHEME, scheme)}")
 
             logStore

spark/src/main/scala/org/apache/spark/sql/delta/util/DeltaProgressReporter.scala

@@ -31,7 +31,7 @@ trait DeltaProgressReporter extends LoggingShims {
       defaultMessage: String,
       data: Map[String, Any] = Map.empty)(body: => T): T = {
     logInfo(log"${MDC(DeltaLogKeys.STATUS, statusCode)}: " +
-      log"${MDC(DeltaLogKeys.MESSAGE, defaultMessage)}")
+      log"${MDC(DeltaLogKeys.STATUS_MESSAGE, defaultMessage)}")
     val t = withJobDescription(defaultMessage)(body)
     logInfo(log"${MDC(DeltaLogKeys.STATUS, statusCode)}: Done")
     t