HeimingZ commented on a change in pull request #5320:
URL: https://github.com/apache/iotdb/pull/5320#discussion_r839337665
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File path: server/src/assembly/resources/conf/iotdb-engine.properties
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@@ -50,25 +50,45 @@ rpc_port=6667
### Write Ahead Log Configuration
####################
-# Is insert ahead log enable
-# Datatype: boolean
-# enable_wal=true
+# Write mode of wal
+# The details of these three modes are as follows:
+# 1. DISABLE: the system will disable wal.
+# 2. SYNC: the system will submit wal synchronously, write request will not
return until its wal is fsynced to the disk successfully.
+# 3. ASYNC: the system will submit wal asynchronously, write request will
return immediately no matter its wal is fsynced to the disk successfully.
+# The write performance order is DISABLE > ASYNC > SYNC, but only SYNC mode
can ensure data durability.
+# wal_mode=SYNC
+
+# Duration a wal flush operation will wait before calling fsync
+# A duration greater than 0 batches multiple wal fsync calls into one. This is
useful when disks are slow or WAL write contention exists.
+# Datatype: long
+# sync_wal_delay_in_ms=0
Review comment:
Fixed.
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