SAMZA-2784: Remove excessive commit logs (#1695)

Author: dxichen

Diff for: samza-core/src/main/java/org/apache/samza/storage/blobstore/BlobStoreBackupManager.java

@@ -236,7 +236,7 @@ public CompletableFuture<Map<String, String>> upload(CheckpointId checkpointId,
         CompletionStage<String> snapshotIndexBlobIdFuture =
             snapshotIndexFuture
                 .thenComposeAsync(si -> {
-                  LOG.info("Uploading Snapshot index: {} for task: {} store: {}", si, taskName, storeName);
+                  LOG.debug("Uploading Snapshot index: {} for task: {} store: {}", si, taskName, storeName);
                   return blobStoreUtil.putSnapshotIndex(si);
                 }, executor);
 
@@ -296,7 +296,7 @@ public CompletableFuture<Void> cleanUp(CheckpointId checkpointId, Map<String, St
         // 1. remove TTL of index blob and all of its files and sub-dirs marked for retention
         CompletionStage<Void> removeTTLFuture =
             snapshotIndexFuture.thenComposeAsync(snapshotIndex -> {
-              LOG.info("Removing TTL for index blob: {} and all of its files and sub-dirs for task: {} store :{}",
+              LOG.debug("Removing TTL for index blob: {} and all of its files and sub-dirs for task: {} store :{}",
                   snapshotIndexBlobId, taskName, storeName);
               return blobStoreUtil.removeTTL(snapshotIndexBlobId, snapshotIndex, requestMetadata);
             }, executor);
@@ -305,7 +305,7 @@ public CompletableFuture<Void> cleanUp(CheckpointId checkpointId, Map<String, St
         // 2. delete the files/subdirs marked for deletion in the snapshot index.
         CompletionStage<Void> cleanupRemoteSnapshotFuture =
             snapshotIndexFuture.thenComposeAsync(snapshotIndex -> {
-              LOG.info("Deleting files and dirs to remove for current index blob: {} for task: {} store: {}",
+              LOG.debug("Deleting files and dirs to remove for current index blob: {} for task: {} store: {}",
                   snapshotIndexBlobId, taskName, storeName);
               return blobStoreUtil.cleanUpDir(snapshotIndex.getDirIndex(), requestMetadata);
             }, executor);
@@ -317,7 +317,7 @@ public CompletableFuture<Void> cleanUp(CheckpointId checkpointId, Map<String, St
             snapshotIndexFuture.thenComposeAsync(snapshotIndex -> {
               if (snapshotIndex.getPrevSnapshotIndexBlobId().isPresent()) {
                 String blobId = snapshotIndex.getPrevSnapshotIndexBlobId().get();
-                LOG.info("Removing previous snapshot index blob: {} from blob store for task: {} store: {}.",
+                LOG.debug("Removing previous snapshot index blob: {} from blob store for task: {} store: {}.",
                     blobId, taskName, storeName);
                 return blobStoreUtil.deleteSnapshotIndexBlob(blobId, requestMetadata);
               } else {

Diff for: samza-core/src/main/java/org/apache/samza/storage/blobstore/util/DirDiffUtil.java

@@ -219,7 +219,7 @@ public static BiPredicate<File, FileIndex> areSameFile(boolean compareLargeFileC
         if (!compareLargeFileChecksums && isLargeFile) {
           // Since RocksDB SST files are immutable after creation, we can skip the expensive checksum computations
           // which requires reading the entire file.
-          LOG.debug("Local file: {} and remote file: {} are same. " +
+          LOG.debug("Local file: {} and remote file: {} both present. " +
                   "Skipping checksum calculation for large file of size: {}.",
               localFile.getAbsolutePath(), remoteFile.getFileName(), localFileAttrs.size());
           return true;
@@ -234,7 +234,7 @@ public static BiPredicate<File, FileIndex> areSameFile(boolean compareLargeFileC
 
             boolean areSameChecksum = localFileChecksum == remoteFile.getChecksum();
             if (!areSameChecksum) {
-              LOG.warn("Local file: {} and remote file: {} are not same. " +
+              LOG.debug("Local file: {} and remote file: {} are not same. " +
                       "Local checksum: {}. Remote checksum: {}",
                   localFile.getAbsolutePath(), remoteFile.getFileName(), localFileChecksum, remoteFile.getChecksum());
             } else {

Diff for: samza-core/src/main/scala/org/apache/samza/container/TaskInstance.scala

@@ -186,7 +186,7 @@ class TaskInstance(
       // WARNING: cleanUp is NOT optional with blob stores since this is where we reset the TTL for
       // tracked blobs. if this TTL reset is skipped, some of the blobs retained by future commits may
       // be deleted in the background by the blob store, leading to data loss.
-      info("Cleaning up stale state from previous run for taskName: %s" format taskName)
+      debug("Cleaning up stale state from previous run for taskName: %s" format taskName)
       commitManager.cleanUp(checkpointV2.getCheckpointId, checkpointV2.getStateCheckpointMarkers)
     }
 
@@ -474,7 +474,7 @@ class TaskInstance(
     new Function[util.Map[String, util.Map[String, String]], CompletableFuture[Void]] {
       override def apply(uploadSCMs: util.Map[String, util.Map[String, String]]): CompletableFuture[Void] = {
         // Perform cleanup on unused checkpoints
-        info("Cleaning up old checkpoint state for taskName: %s checkpointId: %s" format(taskName, checkpointId))
+        debug("Cleaning up old checkpoint state for taskName: %s checkpointId: %s" format(taskName, checkpointId))
         val cleanUpStartTime = System.nanoTime()
         try {
           commitManager.cleanUp(checkpointId, uploadSCMs)