server: remove extra region clone when handle region heartbeat #1195
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| @@ -446,7 +446,6 @@ func (c *clusterInfo) updateStoreStatusLocked(id uint64) { | |||
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| // handleRegionHeartbeat updates the region information. | |||
| func (c *clusterInfo) handleRegionHeartbeat(region *core.RegionInfo) error { | |||
| region = region.Clone() | |||
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The region is used after calling this function. Are you sure that it is safe to not clone? See: https://github.com/pingcap/pd/blob/9b0763fb0474c657c1abbef8238871f3d1284817/server/cluster_worker.go#L28-L41
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Actually, all function only read it. More reassuring, I clone the region which has operator now.
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It does not make sense to clone the region. Cloning the region reads the region too.
I'm not so sure that the region is inmutable. I think you can propose another PR to change all fields of core.RegionInfo to unexported fields and add read only methods to access them. After that we can be sure that the RegionInfo is inmutable and discard the Clone method of it.
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/run-all-tests |
server/api/admin_test.go
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| @@ -71,7 +71,7 @@ func (s *testAdminSuite) TestDropRegion(c *C) { | |||
| c.Assert(err, IsNil) | |||
| c.Assert(res.StatusCode, Equals, http.StatusOK) | |||
| res.Body.Close() | |||
| err = cluster.HandleRegionHeartbeat(region) | |||
| err = cluster.HandleRegionHeartbeat(region.Clone()) | |||
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Can we remove the Clone method?
server/cluster_info_test.go
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| @@ -378,20 +378,12 @@ func (s *testClusterInfoSuite) TestRegionHeartbeat(c *C) { | |||
| checkRegionsKV(c, cluster.kv, regions[:i+1]) | |||
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| // region is updated. | |||
server/cluster_info_test.go
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| ) | ||
| regions[i] = region | ||
| c.Assert(cluster.handleRegionHeartbeat(region), IsNil) | ||
| checkRegions(c, cluster.core.Regions, regions[:i+1]) | ||
| checkRegionsKV(c, cluster.kv, regions[:i+1]) |
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What have you changed? (required)
the region variable already is a new object from the request. we only read it in one goroutine now, so the clone is useless, remove it.
What are the type of the changes (required)?
How has this PR been tested (required)?
manual tests
unit tests