Update model-server/src/main/kotlin/org/modelix/model/server/store/Ig…

…niteStoreClient.kt Co-authored-by: Oleksandr Dzhychko <[email protected]>
modelix · Dec 12, 2024 · 09c1af7 · 09c1af7
1 parent 8047bc4
commit 09c1af7
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/model-server/src/main/kotlin/org/modelix/model/server/store/IgniteStoreClient.kt b/model-server/src/main/kotlin/org/modelix/model/server/store/IgniteStoreClient.kt
@@ -198,6 +198,12 @@ class IgniteStoreClient(jdbcProperties: Properties? = null, private val inmemory
                 globalReadTransactions.acquireAndRun(maxReadTransactions) {
                     val transactions = ignite.transactions()
                     check(transactions.tx() == null) { "Already inside a transaction" }
+                    // `OPTIMISTIC` and `READ_COMMITTED` 
+                    // are used instead of the default `PESSIMISTIC` and `REPEATABLE_READ`
+                    // because they do not acquire fewer locks when writing.
+                    // It is ok to acquire fewer locks, 
+                    // because the `globalReadTransactions` 
+                    // semaphore ensures no writes can happen in parallel.
                     transactions.txStart(TransactionConcurrency.OPTIMISTIC, TransactionIsolation.READ_COMMITTED).use { tx ->
                         pendingChangeMessages.runAndFlush {
                             val result = body()