jt2594838 commented on code in PR #12122:
URL: https://github.com/apache/iotdb/pull/12122#discussion_r1580434946


##########
iotdb-core/node-commons/src/assembly/resources/conf/iotdb-common.properties:
##########
@@ -450,6 +450,25 @@ data_replication_factor=1
 # Unit: ms
 # default_ttl_in_ms=-1
 
+# The threshold for the number of TTL stored in the system, the default is 
1000.
+# Negative value means the threshold is unlimited.
+# Datatype: int
+# ttl_count_threshold=1000
+
+# The interval of ttl check task in each database. Default is 2 hours.
+# Notice: It is not recommended to change it too small, as it will affect the 
read and write performance of the system.
+# Unit: ms
+# ttl_check_interval=7200000
+
+# The max expired time of device set with ttl. If the expired time exceeds 
this value, then the expired data will be cleaned by compaction. Default is 1 
month.
+# Notice: It is not recommended to change it too small, as it will affect the 
read and write performance of the system.
+# Unit: ms
+# max_expired_time=2592000000
+
+# The expired device rate. If the number of expired devices in one tsfile 
exceeds this value, then expired data of this tsfile will be cleaned by 
compaction.

Review Comment:
   The same issues are found in IoTDBConfig, please check there.
   Also, it seems that only the comments are changed, but the names of the 
config remain.



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