*: write system timezone into mysql.tidb in bootstrap stage. #7638
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zhexuany
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coocood
reviewed
Sep 7, 2018
executor/distsql.go
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| @@ -139,9 +141,15 @@ func zone(sctx sessionctx.Context) (string, int64) { | |||
| if name == "Local" { | |||
| path, err := filepath.EvalSymlinks("/etc/localtime") | |||
| if err != nil { | |||
| log.Errorln(err) | |||
| return "Sysytem", int64(offset) | |||
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Yes. I have no idea why this happens. - - Already fixed.
breezewish
reviewed
Sep 7, 2018
executor/distsql.go
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| @@ -117,6 +119,18 @@ func closeAll(objs ...Closeable) error { | |||
| return errors.Trace(err) | |||
| } | |||
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| // GetTZNameFromFileName gets IANA timezone name from zoninfo path. | |||
executor/distsql.go
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| path, err := filepath.EvalSymlinks("/etc/localtime") | ||
| if err != nil { | ||
| log.Errorln(err) | ||
| return "Sysytem", int64(offset) |
executor/distsql.go
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| idx := strings.Index(path, substr) | ||
| return string(path[idx+len(substr)+1:]), nil | ||
| } | ||
| return "", errors.New("only support softlink has share/zoneinfo as a suffix" + path) |
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maybe this is not kind of a suffix?
| @@ -164,13 +165,26 @@ func (h *rpcHandler) buildDAGExecutor(req *coprocessor.Request) (*dagContext, ex | |||
| return ctx, e, dagReq, err | |||
| } | |||
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| func getTZNameFromFileName(path string) (string, error) { | |||
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why is it implemented again here?
breezewish
reviewed
Sep 7, 2018
executor/distsql.go
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| @@ -127,7 +141,17 @@ func zone(sctx sessionctx.Context) (string, int64) { | |||
| var name string | |||
| name = loc.String() | |||
| if name == "Local" { | |||
| name = "System" | |||
| path, err := filepath.EvalSymlinks("/etc/localtime") | |||
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How is this function evaluated? If it is evaluated frequently, we need to cache the zone.
lysu
reviewed
Sep 7, 2018
executor/distsql.go
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| idx := strings.Index(path, substr) | ||
| return string(path[idx+len(substr)+1:]), nil | ||
| } | ||
| return "", errors.New("only support softlink has share/zoneinfo as a suffix" + path) |
| @@ -164,13 +165,26 @@ func (h *rpcHandler) buildDAGExecutor(req *coprocessor.Request) (*dagContext, ex | |||
| return ctx, e, dagReq, err | |||
| } | |||
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| func getTZNameFromFileName(path string) (string, error) { | |||
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seems be duplicated to GetTZNameFromFileName and no any caller~?
breezewish
reviewed
Sep 7, 2018
breezewish
previously approved these changes
Sep 7, 2018
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@lysu PTAL |
breezewish
previously approved these changes
Sep 8, 2018
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LGTM |
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/run-all-tests |
…into get_tz_name_from_zoneinfo
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/run-all-tests |
tiancaiamao
reviewed
Sep 14, 2018
util/timeutil/time.go
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| // Local returns time.Local's IANA timezone name. It is TiDB's global timezone name. | ||
| func Local() *time.Location { | ||
| loc, err := LoadLocation(systemTZ) |
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What happen when Local() is called before or during cluster bootstrapping ?
systemTZ is not initialized yet.
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see line 11. I assign "System" to it in order to avoid test case failure.
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@shenli @tiancaiamao @breeswish PTAL |
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/run-all-tests |
shenli
reviewed
Sep 14, 2018
session/session.go
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| func loadSystemTZ(se *session) (string, error) { | ||
| sql := `select variable_value from mysql.tidb where variable_name = "system_tz"` | ||
| rss, errLoad := se.Execute(context.Background(), sql) | ||
| defer rss[0].Close() |
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If errLoad is not nill, the rss maybe empty.
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@shenli @tiancaiamao PTAL |
shenli
reviewed
Sep 14, 2018
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shenli
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Sep 14, 2018
util/timeutil/time.go
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| } | ||
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| // getLoc first trying to load location from a cache map. If nothing found in such map, then call | ||
| // `time.LoadLocation` to get a timezone location. After trying both way, an error wil be returned |
util/timeutil/time.go
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| // `time.LoadLocation` to get a timezone location. After trying both way, an error wil be returned | ||
| // if valid Location is not found. | ||
| func (lm *locCache) getLoc(name string) (*time.Location, error) { | ||
| if name == "System" { |
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Define a constant for "System". Should we consider case insensitive comparison?
| name = loc.String() | ||
| // when we found name is "SystemLocation", we have no chice but push down | ||
| // "System" to tikv side. | ||
| if name == "Local" { |
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Please make sure TiKV would handle this @breeswish
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LGTM @shenli |
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/run-all-tests |
shenli
approved these changes
Sep 14, 2018
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What problem does this PR solve?
It retrieves real IANA timezone name when the location is local. This can avoid the performance delegation on TiKV side.
What is changed and how it works?
We need first get the soft link from
/etc/localtime. And then check whether the soft link path containsshare/zoneinfoor not. If yes, we get the real IANA timezone name from this path.If you want to know more about how this PR works please refer to this PR
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