Transaction fix (#151)

* fix: backport exponential backoff and retries

* chore: changelog and version

Author: sattvikc

CHANGELOG.md

@@ -7,6 +7,10 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [2.4.1] - 2023-09-05
+
+- Exponential backoff and increased retries for transactions
+
 ## [2.4.0] - 2023-03-30
 
 - Support for Dashboard Search

build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'java-library'
 }
 
-version = "2.4.0"
+version = "2.4.1"
 
 repositories {
     mavenCentral()

src/main/java/io/supertokens/storage/postgresql/Start.java

@@ -191,6 +191,7 @@ public <T> T startTransaction(TransactionLogic<T> logic)
     @Override
     public <T> T startTransaction(TransactionLogic<T> logic, TransactionIsolationLevel isolationLevel)
             throws StorageTransactionLogicException, StorageQueryException {
+        final int NUM_TRIES = 50;
         int tries = 0;
         while (true) {
             tries++;
@@ -231,9 +232,9 @@ public <T> T startTransaction(TransactionLogic<T> logic, TransactionIsolationLev
                         // we have deadlock as well due to the DeadlockTest.java
                         exceptionMessage.toLowerCase().contains("deadlock");
 
-                if ((isPSQLRollbackException || isDeadlockException) && tries < 3) {
+                if ((isPSQLRollbackException || isDeadlockException) && tries < NUM_TRIES) {
                     try {
-                        Thread.sleep((long) (10 + (Math.random() * 20)));
+                        Thread.sleep((long) (10 + (250 + Math.min(Math.pow(2, tries), 3000)) * Math.random()));
                     } catch (InterruptedException ignored) {
                     }
                     ProcessState.getInstance(this).addState(ProcessState.PROCESS_STATE.DEADLOCK_FOUND, e);