[GitHub] [incubator-kvrocks] PragmaTwice commented on a diff in pull request #953: feat: add mutil_path to conf

[GitBox <gi...@apache.org>]

PragmaTwice commented on code in PR #953:
URL: https://github.com/apache/incubator-kvrocks/pull/953#discussion_r1063078508


##########
kvrocks.conf:
##########
@@ -760,5 +760,36 @@ rocksdb.write_options.low_pri no
 # Default: no
 rocksdb.write_options.memtable_insert_hint_per_batch no
 
+# A list of paths where SST files can be put into, with its target size.
+# Newer data is placed into paths specified earlier in the vector while
+# older data gradually moves to paths specified later in the vector.
+#
+# For example, you have a flash device with 10GB allocated for the DB,
+# as well as a hard drive of 2TB, you should config it to be:
+#   [{"/flash_path", 10GB}, {"/hard_drive", 2TB}]
+#
+# The system will try to guarantee data under each path is close to but
+# not larger than the target size. But current and future file sizes used
+# by determining where to place a file are based on best-effort estimation,
+# which means there is a chance that the actual size under the directory
+# is slightly more than target size under some workloads. User should give
+# some buffer room for those cases.
+#
+# If none of the paths has sufficient room to place a file, the file will
+# be placed to the last path anyway, despite to the target size.
+#
+# Placing newer data to earlier paths is also best-efforts. User should
+# expect user files to be placed in higher levels in some extreme cases.
+#
+# If left empty, only one path will be used, which is db_name passed when
+# opening the DB.
+# Default: empty
+#
+# If KVRocks stores a lot of cold data, you can use this parameter to
+# reduce the amount of high performance disk usage.
+#
+# Default: empty

Review Comment:
   duplicated "default"



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