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Relax active connection check to reduce flakiness (#458)

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Shicong Huang 2020-01-23 18:09:20 -05:00 • committed by GitHub
parent ab0410422c
commit 7c3f685946
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1 changed files with 14 additions and 7 deletions
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21
core/src/test/java/google/registry/persistence/transaction/JpaTransactionManagerRule.java
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@ -14,7 +14,7 @@
package google.registry.persistence.transaction;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static org.testcontainers.containers.PostgreSQLContainer.POSTGRESQL_PORT;
import com.google.common.base.Charsets;
@ -67,6 +67,7 @@ abstract class JpaTransactionManagerRule extends ExternalResource {
// The type of JDBC connections started by the tests. This string value
// is documented in PSQL's official user guide.
private static final String CONNECTION_BACKEND_TYPE = "client backend";
private static final int ACTIVE_CONNECTIONS_CAP = 5;
private final Clock clock;
private final Optional<String> initScriptPath;
@ -122,7 +123,7 @@ abstract class JpaTransactionManagerRule extends ExternalResource {
builder.put(Environment.SHOW_SQL, "true");
properties = builder.build();
}
assertNoActiveTestConnections();
assertReasonableNumDbConnections();
emf =
createEntityManagerFactory(
getJdbcUrlFor(POSTGRES_DB_NAME),
@ -143,14 +144,18 @@ abstract class JpaTransactionManagerRule extends ExternalResource {
emf = null;
}
cachedTm = null;
assertNoActiveTestConnections();
assertReasonableNumDbConnections();
}
/**
* Asserts that all JDBC connections started by the test classes to the 'postgres' database have
* been closed.
* Asserts that the number of connections to the test database is reasonable, i.e. less than 5.
* Ideally, it should be 0 if the connection is closed by the test as we don't use a connection
* pool. However, Hibernate may still maintain some connection by it self. In addition, the
* metadata table we use to detect active connection may not remove the closed connection
* immediately. So, we decide to relax the condition to check if the number of active connection
* is less than 5 to reduce flakiness.
*/
private void assertNoActiveTestConnections() {
private void assertReasonableNumDbConnections() {
// Use the 'management' db to connect so that this connection needs not to be accounted for.
try (Connection conn = createConnection(MANAGEMENT_DB_NAME);
Statement statement = conn.createStatement()) {
@ -165,7 +170,9 @@ abstract class JpaTransactionManagerRule extends ExternalResource {
+ " and backend_type = '%3s'",
database.getUsername(), POSTGRES_DB_NAME, CONNECTION_BACKEND_TYPE));
rs.next();
assertThat(rs.getLong(1)).isEqualTo(0);
assertWithMessage("Too many active connections to database")
.that(rs.getLong(1))
.isLessThan(ACTIVE_CONNECTIONS_CAP);
} catch (Exception e) {
throw new RuntimeException(e);
}