From ae3fd4252a66bf54fbefd76be54a53a65b995efc Mon Sep 17 00:00:00 2001
From: David Garcia Quintas <dgq@google.com>
Date: Wed, 30 Nov 2016 14:31:57 -0800
Subject: [PATCH] Deflaked lb_policies_test
---
test/core/client_channel/lb_policies_test.c | 116 +++++++-------------
1 file changed, 38 insertions(+), 78 deletions(-)
diff --git a/test/core/client_channel/lb_policies_test.c b/test/core/client_channel/lb_policies_test.c
index 95595d7c51..47836bd32c 100644
--- a/test/core/client_channel/lb_policies_test.c
+++ b/test/core/client_channel/lb_policies_test.c
@@ -64,9 +64,11 @@ typedef struct servers_fixture {
} servers_fixture;
typedef struct request_sequences {
- size_t n;
- int *connections;
- int *connectivity_states;
+ size_t n; /* number of iterations */
+ int *connections; /* indexed by the interation number, value is the index of
+ the server it connected to or -1 if none */
+ int *connectivity_states; /* indexed by the interation number, value is the
+ client connectivity state */
} request_sequences;
typedef void (*verifier_fn)(const servers_fixture *, grpc_channel *,
@@ -780,15 +782,18 @@ static void verify_total_carnage_round_robin(const servers_fixture *f,
}
}
- /* no server is ever available. The persistent state is TRANSIENT_FAILURE */
+ /* no server is ever available. The persistent state is TRANSIENT_FAILURE. May
+ * also be CONNECTING if, under load, this check took too long to run and some
+ * subchannel already transitioned to retrying. */
for (size_t i = 0; i < sequences->n; i++) {
const grpc_connectivity_state actual = sequences->connectivity_states[i];
- const grpc_connectivity_state expected = GRPC_CHANNEL_TRANSIENT_FAILURE;
- if (actual != expected) {
+ const uint32_t expected_bitset =
+ GRPC_CHANNEL_TRANSIENT_FAILURE | GRPC_CHANNEL_CONNECTING;
+ if (((uint32_t)actual & expected_bitset) == 0) {
gpr_log(GPR_ERROR,
- "CONNECTIVITY STATUS SEQUENCE FAILURE: expected '%s', got '%s' "
- "at iteration #%d",
- grpc_connectivity_state_name(expected),
+ "CONNECTIVITY STATUS SEQUENCE FAILURE: expected "
+ "GRPC_CHANNEL_TRANSIENT_FAILURE or GRPC_CHANNEL_CONNECTING, got "
+ "'%s' at iteration #%d",
grpc_connectivity_state_name(actual), (int)i);
abort();
}
@@ -825,8 +830,7 @@ static void verify_partial_carnage_round_robin(
}
/* We can assert that the first client channel state should be READY, when all
- * servers were available; and that the last one should be TRANSIENT_FAILURE,
- * after all servers are gone. */
+ * servers were available */
grpc_connectivity_state actual = sequences->connectivity_states[0];
grpc_connectivity_state expected = GRPC_CHANNEL_READY;
if (actual != expected) {
@@ -838,15 +842,21 @@ static void verify_partial_carnage_round_robin(
abort();
}
+ /* ... and that the last one should be TRANSIENT_FAILURE, after all servers
+ * are gone. May also be CONNECTING if, under load, this check took too long
+ * to run and the subchannel already transitioned to retrying. */
actual = sequences->connectivity_states[num_iters - 1];
- expected = GRPC_CHANNEL_TRANSIENT_FAILURE;
- if (actual != expected) {
- gpr_log(GPR_ERROR,
- "CONNECTIVITY STATUS SEQUENCE FAILURE: expected '%s', got '%s' "
- "at iteration #%d",
- grpc_connectivity_state_name(expected),
- grpc_connectivity_state_name(actual), (int)num_iters - 1);
- abort();
+ const uint32_t expected_bitset =
+ GRPC_CHANNEL_TRANSIENT_FAILURE | GRPC_CHANNEL_CONNECTING;
+ for (i = 0; i < sequences->n; i++) {
+ if (((uint32_t)actual & expected_bitset) == 0) {
+ gpr_log(GPR_ERROR,
+ "CONNECTIVITY STATUS SEQUENCE FAILURE: expected "
+ "GRPC_CHANNEL_TRANSIENT_FAILURE or GRPC_CHANNEL_CONNECTING, got "
+ "'%s' at iteration #%d",
+ grpc_connectivity_state_name(actual), (int)i);
+ abort();
+ }
}
gpr_free(expected_connection_sequence);
@@ -873,68 +883,21 @@ static void verify_rebirth_round_robin(const servers_fixture *f,
grpc_channel *client,
const request_sequences *sequences,
const size_t num_iters) {
- int *expected_connection_sequence;
- size_t i, j, unique_seq_last_idx, unique_seq_first_idx;
- const size_t expected_seq_length = f->num_servers;
- int *seen_elements;
-
dump_array("actual_connection_sequence", sequences->connections, num_iters);
- /* verify conn. seq. expectation */
- /* get the first unique run of length "num_servers". */
- expected_connection_sequence = gpr_malloc(sizeof(int) * expected_seq_length);
- seen_elements = gpr_malloc(sizeof(int) * expected_seq_length);
-
- unique_seq_last_idx = ~(size_t)0;
-
- memset(seen_elements, 0, sizeof(int) * expected_seq_length);
- for (i = 0; i < num_iters; i++) {
- if (sequences->connections[i] < 0 ||
- seen_elements[sequences->connections[i]] != 0) {
- /* if anything breaks the uniqueness of the run, back to square zero */
- memset(seen_elements, 0, sizeof(int) * expected_seq_length);
- continue;
- }
- seen_elements[sequences->connections[i]] = 1;
- for (j = 0; j < expected_seq_length; j++) {
- if (seen_elements[j] == 0) break;
- }
- if (j == expected_seq_length) { /* seen all the elements */
- unique_seq_last_idx = i;
- break;
- }
- }
- /* make sure we found a valid run */
- dump_array("seen_elements", seen_elements, expected_seq_length);
- for (j = 0; j < expected_seq_length; j++) {
- GPR_ASSERT(seen_elements[j] != 0);
- }
-
- GPR_ASSERT(unique_seq_last_idx != ~(size_t)0);
-
- unique_seq_first_idx = (unique_seq_last_idx - expected_seq_length + 1);
- memcpy(expected_connection_sequence,
- sequences->connections + unique_seq_first_idx,
- sizeof(int) * expected_seq_length);
-
/* first iteration succeeds */
GPR_ASSERT(sequences->connections[0] != -1);
/* then we fail for a while... */
GPR_ASSERT(sequences->connections[1] == -1);
- /* ... but should be up at "unique_seq_first_idx" */
- GPR_ASSERT(sequences->connections[unique_seq_first_idx] != -1);
-
- for (j = 0, i = unique_seq_first_idx; i < num_iters; i++) {
- const int actual = sequences->connections[i];
- const int expected =
- expected_connection_sequence[j++ % expected_seq_length];
- if (actual != expected) {
- print_failed_expectations(expected_connection_sequence,
- sequences->connections, expected_seq_length,
- num_iters);
- abort();
+ /* ... but should be up eventually */
+ size_t first_iter_back_up = ~0ul;
+ for (size_t i = 2; i < sequences->n; ++i) {
+ if (sequences->connections[i] != -1) {
+ first_iter_back_up = i;
+ break;
}
}
+ GPR_ASSERT(first_iter_back_up != ~0ul);
/* We can assert that the first client channel state should be READY, when all
* servers were available; same thing for the last one. In the middle
@@ -962,7 +925,7 @@ static void verify_rebirth_round_robin(const servers_fixture *f,
}
bool found_failure_status = false;
- for (i = 1; i < sequences->n - 1; i++) {
+ for (size_t i = 1; i < sequences->n - 1; i++) {
if (sequences->connectivity_states[i] == GRPC_CHANNEL_TRANSIENT_FAILURE) {
found_failure_status = true;
break;
@@ -974,14 +937,11 @@ static void verify_rebirth_round_robin(const servers_fixture *f,
"CONNECTIVITY STATUS SEQUENCE FAILURE: "
"GRPC_CHANNEL_TRANSIENT_FAILURE status not found. Got the following "
"instead:");
- for (i = 0; i < num_iters; i++) {
+ for (size_t i = 0; i < num_iters; i++) {
gpr_log(GPR_ERROR, "[%d]: %s", (int)i,
grpc_connectivity_state_name(sequences->connectivity_states[i]));
}
}
-
- gpr_free(expected_connection_sequence);
- gpr_free(seen_elements);
}
int main(int argc, char **argv) {
--
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