TiDB: add a variable to control the max index length (#1193) (#1194)

pingcap · Mar 4, 2020 · dffd679 · dffd679
1 parent 56d7483
commit dffd679
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diff --git a/conf/tidb.yml b/conf/tidb.yml
@@ -40,6 +40,9 @@ global:
   # check mb4 value in utf8 is used to control whether to check the mb4 characters when the charset is utf8.
   # check-mb4-value-in-utf8: true
 
+  # max-index-length is used to deal with compatibility issues from v3.0.7 and previous version upgrades. It can only be in [3072, 3072*4].
+  # max-index-length: 3072
+
 log:
   # Log level: debug, info, warn, error, fatal.
   # level: "info"

diff --git a/roles/tidb/vars/default.yml b/roles/tidb/vars/default.yml
@@ -52,6 +52,9 @@ global:
   # check mb4 value in utf8 is used to control whether to check the mb4 characters when the charset is utf8.
   # check-mb4-value-in-utf8: true
 
+  # max-index-length is used to deal with compatibility issues from v3.0.7 and previous version upgrades. It can only be in [3072, 3072*4].
+  max-index-length: 3072
+
 log:
   # Log level: debug, info, warn, error, fatal.
   level: "info"