Merge pull request #21274 from markdroth/xds_test_sharding

Shard xds_end2end_test.

bazel/grpc_build_system.bzl

@@ -189,7 +189,7 @@ def ios_cc_test(
             deps = ios_test_deps,
         )
 
-def grpc_cc_test(name, srcs = [], deps = [], external_deps = [], args = [], data = [], uses_polling = True, language = "C++", size = "medium", timeout = None, tags = [], exec_compatible_with = [], exec_properties = {}):
+def grpc_cc_test(name, srcs = [], deps = [], external_deps = [], args = [], data = [], uses_polling = True, language = "C++", size = "medium", timeout = None, tags = [], exec_compatible_with = [], exec_properties = {}, shard_count = None):
     copts = if_mac(["-DGRPC_CFSTREAM"])
     if language.upper() == "C":
         copts = copts + if_not_windows(["-std=c99"])
@@ -204,6 +204,7 @@ def grpc_cc_test(name, srcs = [], deps = [], external_deps = [], args = [], data
         "timeout": timeout,
         "exec_compatible_with": exec_compatible_with,
         "exec_properties": exec_properties,
+        "shard_count": shard_count,
     }
     if uses_polling:
         # the vanilla version of the test should run on platforms that only

test/cpp/end2end/BUILD

@@ -520,6 +520,7 @@ grpc_cc_test(
         "//test/core/util:grpc_test_util",
         "//test/cpp/util:test_util",
     ],
+    shard_count = 10,
 )
 
 grpc_cc_test(