singhpk234 commented on code in PR #1517:
URL: https://github.com/apache/polaris/pull/1517#discussion_r2078439601
##########
extension/persistence/relational-jdbc/src/test/java/org/apache/polaris/extension/persistence/impl/relational/jdbc/AtomicMetastoreManagerWithJdbcBasePersistenceImplTest.java:
##########
@@ -67,4 +70,22 @@ protected PolarisTestMetaStoreManager
createPolarisTestMetaStoreManager() {
new PolarisConfigurationStore() {},
timeSource.withZone(ZoneId.systemDefault())));
}
+
+ private static class H2JdbcConfiguration implements
RelationalJdbcConfiguration {
Review Comment:
this is a test its just testing purpose, hence a constant
##########
extension/persistence/relational-jdbc/src/main/java/org/apache/polaris/extension/persistence/relational/jdbc/DatasourceOperations.java:
##########
@@ -173,23 +190,82 @@ public int executeUpdate(String query) throws
SQLException {
* @throws SQLException : Exception caught during transaction execution.
*/
public void runWithinTransaction(TransactionCallback callback) throws
SQLException {
- try (Connection connection = borrowConnection()) {
- boolean autoCommit = connection.getAutoCommit();
- connection.setAutoCommit(false);
- boolean success = false;
+ withRetries(
+ () -> {
+ try (Connection connection = borrowConnection()) {
+ boolean autoCommit = connection.getAutoCommit();
+ boolean success = false;
+ connection.setAutoCommit(false);
+ try {
+ try (Statement statement = connection.createStatement()) {
+ success = callback.execute(statement);
+ }
+ } finally {
+ if (success) {
+ connection.commit();
+ } else {
+ connection.rollback();
+ }
+ connection.setAutoCommit(autoCommit);
+ }
+ }
+ return null;
+ });
+ }
+
+ private boolean isRetryable(SQLException e) {
+ String sqlState = e.getSQLState();
+
+ if (sqlState != null) {
+ return sqlState.equals(DEADLOCK_SQL_CODE)
+ || // Deadlock detected
+ sqlState.equals(SERIALIZATION_FAILURE_SQL_CODE); // Serialization
failure
+ }
+
+ // Additionally, one might check for specific error messages or other
conditions
+ return e.getMessage().contains("connection refused")
+ || e.getMessage().contains("connection reset");
+ }
+
+ public <T> T withRetries(Operation<T> operation) throws SQLException {
+ int attempts = 0;
+ // maximum number of retries.
+ int maxAttempts = relationalJdbcConfiguration.maxRetries().orElse(1);
Review Comment:
I see, Here was my thought process, that those people who have configured
just the maxRetries be bounded by default max retry duration ? 5000 ms in that
sense before we sleep for ages we do check before our sleep that if that sleep
is well within our maxRetry duration ? if the person configures infinite retry
lets says INT_MAX and the duration INT_MAX then its their responsibility ?
##########
extension/persistence/relational-jdbc/src/main/java/org/apache/polaris/extension/persistence/relational/jdbc/DatasourceOperations.java:
##########
@@ -173,23 +190,86 @@ public int executeUpdate(String query) throws
SQLException {
* @throws SQLException : Exception caught during transaction execution.
*/
public void runWithinTransaction(TransactionCallback callback) throws
SQLException {
- try (Connection connection = borrowConnection()) {
- boolean autoCommit = connection.getAutoCommit();
- connection.setAutoCommit(false);
- boolean success = false;
+ withRetries(
+ () -> {
+ try (Connection connection = borrowConnection()) {
+ boolean autoCommit = connection.getAutoCommit();
+ boolean success = false;
+ connection.setAutoCommit(false);
+ try {
+ try (Statement statement = connection.createStatement()) {
+ success = callback.execute(statement);
+ }
+ } finally {
+ if (success) {
+ connection.commit();
+ } else {
+ connection.rollback();
+ }
+ connection.setAutoCommit(autoCommit);
+ }
+ }
+ return null;
+ });
+ }
+
+ private boolean isRetryable(SQLException e) {
+ String sqlState = e.getSQLState();
+
+ if (sqlState != null) {
+ return sqlState.equals(DEADLOCK_SQL_CODE)
+ || // Deadlock detected
+ sqlState.equals(SERIALIZATION_FAILURE_SQL_CODE); // Serialization
failure
+ }
+
+ // Additionally, one might check for specific error messages or other
conditions
+ return e.getMessage().contains("connection refused")
+ || e.getMessage().contains("connection reset");
+ }
+
+ public <T> T withRetries(Operation<T> operation) throws SQLException {
+ int attempts = 0;
+ // maximum number of retries.
+ int maxAttempts = relationalJdbcConfiguration.maxRetries().orElse(1);
+ // How long we should try, since the first attempt.
+ long maxDuration =
relationalJdbcConfiguration.maxDurationInMs().orElse(5000L);
+ // How long to wait before first failure.
+ long delay = relationalJdbcConfiguration.initialDelayInMs().orElse(100L);
+
+ // maximum time we will retry till.
+ long maxRetryTime = Clock.systemUTC().millis() + maxDuration;
+
+ while (attempts < maxAttempts) {
try {
- try (Statement statement = connection.createStatement()) {
- success = callback.execute(statement);
+ return operation.execute();
+ } catch (SQLException e) {
+ attempts++;
+ long timeLeft = Math.max((maxRetryTime - Clock.systemUTC().millis()),
0L);
+ if (attempts >= maxAttempts || !isRetryable(e) || timeLeft == 0) {
+ String exceptionMessage =
+ String.format(
+ "Failed due to %s, after , %s attempts and %s milliseconds",
+ e.getMessage(), attempts, maxDuration);
+ throw new SQLException(exceptionMessage, e.getSQLState(),
e.getErrorCode());
}
- } finally {
- if (success) {
- connection.commit();
- } else {
- connection.rollback();
+ // Add jitter
+ long timeToSleep = Math.min(timeLeft, delay + (long)
(random.nextFloat() * 0.2 * delay));
Review Comment:
I think we going more toward implementing our own retry lib, but for JDBC
specially type of one shot queries (non transactional) what we have should not
require this at these knobs at moment IMHO.
Definitely if the retry loop package is available, when NO-SQL gets in, I am
happy to refactor it to use that instead of this basic impl.
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