[MINOR] support different cleaning policy for flink

hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/configuration/FlinkOptions.java

@@ -21,6 +21,7 @@
 import org.apache.hudi.common.config.ConfigClassProperty;
 import org.apache.hudi.common.config.ConfigGroups;
 import org.apache.hudi.common.config.HoodieConfig;
+import org.apache.hudi.common.model.HoodieCleaningPolicy;
 import org.apache.hudi.common.model.HoodieTableType;
 import org.apache.hudi.common.model.OverwriteWithLatestAvroPayload;
 import org.apache.hudi.config.HoodieIndexConfig;
@@ -549,13 +550,26 @@ private FlinkOptions() {
       .defaultValue(true)
       .withDescription("Whether to cleanup the old commits immediately on new commits, enabled by default");
 
+  public static final ConfigOption<String> CLEAN_POLICY = ConfigOptions
+      .key("clean.policy")
+      .stringType()
+      .defaultValue(HoodieCleaningPolicy.KEEP_LATEST_COMMITS.name())
+      .withDescription("Clean policy to manage the Hudi table. Available option: KEEP_LATEST_COMMITS, KEEP_LATEST_FILE_VERSIONS, KEEP_LATEST_BY_HOURS."
+          +  "Default is KEEP_LATEST_COMMITS.");
+
   public static final ConfigOption<Integer> CLEAN_RETAIN_COMMITS = ConfigOptions
       .key("clean.retain_commits")
       .intType()
       .defaultValue(30)// default 30 commits
       .withDescription("Number of commits to retain. So data will be retained for num_of_commits * time_between_commits (scheduled).\n"
           + "This also directly translates into how much you can incrementally pull on this table, default 30");
 
+  public static final ConfigOption<Integer> CLEAN_RETAIN_FILE_VERSIONS = ConfigOptions
+      .key("clean.retain_file_versions")
+      .intType()
+      .defaultValue(5)// default 5 version
+      .withDescription("Number of file versions to retain. default 5");
+
   public static final ConfigOption<Integer> ARCHIVE_MAX_COMMITS = ConfigOptions
       .key("archive.max_commits")
       .intType()

hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/streamer/FlinkStreamerConfig.java

@@ -19,6 +19,7 @@
 package org.apache.hudi.streamer;
 
 import org.apache.hudi.client.utils.OperationConverter;
+import org.apache.hudi.common.model.HoodieCleaningPolicy;
 import org.apache.hudi.common.model.OverwriteWithLatestAvroPayload;
 import org.apache.hudi.common.model.WriteOperationType;
 import org.apache.hudi.common.util.StringUtils;
@@ -260,11 +261,20 @@ public class FlinkStreamerConfig extends Configuration {
   @Parameter(names = {"--clean-async-enabled"}, description = "Whether to cleanup the old commits immediately on new commits, enabled by default")
   public Boolean cleanAsyncEnabled = true;
 
+  @Parameter(names = {"--clean-policy"},
+      description = "Clean policy to manage the Hudi table. Available option: KEEP_LATEST_COMMITS, KEEP_LATEST_FILE_VERSIONS, KEEP_LATEST_BY_HOURS."
+          +  "Default is KEEP_LATEST_COMMITS.")
+  public String cleanPolicy = HoodieCleaningPolicy.KEEP_LATEST_COMMITS.name();
+
   @Parameter(names = {"--clean-retain-commits"},
       description = "Number of commits to retain. So data will be retained for num_of_commits * time_between_commits (scheduled).\n"
           + "This also directly translates into how much you can incrementally pull on this table, default 10")
   public Integer cleanRetainCommits = 10;
 
+  @Parameter(names = {"--clean-retain-file-versions"},
+      description = "Number of file versions to retain. Each file group will be retained for this number of version. default 5")
+  public Integer cleanRetainFileVersions = 5;
+
   @Parameter(names = {"--archive-max-commits"},
       description = "Max number of commits to keep before archiving older commits into a sequential log, default 30")
   public Integer archiveMaxCommits = 30;
@@ -392,7 +402,9 @@ public static org.apache.flink.configuration.Configuration toFlinkConfig(FlinkSt
     conf.setInteger(FlinkOptions.COMPACTION_MAX_MEMORY, config.compactionMaxMemory);
     conf.setLong(FlinkOptions.COMPACTION_TARGET_IO, config.compactionTargetIo);
     conf.setBoolean(FlinkOptions.CLEAN_ASYNC_ENABLED, config.cleanAsyncEnabled);
+    conf.setString(FlinkOptions.CLEAN_POLICY, config.cleanPolicy);
     conf.setInteger(FlinkOptions.CLEAN_RETAIN_COMMITS, config.cleanRetainCommits);
+    conf.setInteger(FlinkOptions.CLEAN_RETAIN_FILE_VERSIONS, config.cleanRetainFileVersions);
     conf.setInteger(FlinkOptions.ARCHIVE_MAX_COMMITS, config.archiveMaxCommits);
     conf.setInteger(FlinkOptions.ARCHIVE_MIN_COMMITS, config.archiveMinCommits);
     conf.setBoolean(FlinkOptions.HIVE_SYNC_ENABLED, config.hiveSyncEnabled);

hudi-flink-datasource/hudi-flink/src/main/java/org/apache/hudi/util/StreamerUtil.java

@@ -176,11 +176,12 @@ public static HoodieWriteConfig getHoodieClientConfig(
                     .withMaxDeltaSecondsBeforeCompaction(conf.getInteger(FlinkOptions.COMPACTION_DELTA_SECONDS))
                     .withAsyncClean(conf.getBoolean(FlinkOptions.CLEAN_ASYNC_ENABLED))
                     .retainCommits(conf.getInteger(FlinkOptions.CLEAN_RETAIN_COMMITS))
+                    .retainFileVersions(conf.getInteger(FlinkOptions.CLEAN_RETAIN_FILE_VERSIONS))
                     // override and hardcode to 20,
                     // actually Flink cleaning is always with parallelism 1 now
                     .withCleanerParallelism(20)
                     .archiveCommitsWith(conf.getInteger(FlinkOptions.ARCHIVE_MIN_COMMITS), conf.getInteger(FlinkOptions.ARCHIVE_MAX_COMMITS))
-                    .withCleanerPolicy(HoodieCleaningPolicy.KEEP_LATEST_COMMITS)
+                    .withCleanerPolicy(HoodieCleaningPolicy.valueOf(conf.getString(FlinkOptions.CLEAN_POLICY)))
                     .build())
             .withMemoryConfig(
                 HoodieMemoryConfig.newBuilder()