tkalkirill commented on code in PR #1313:
URL: https://github.com/apache/ignite-3/pull/1313#discussion_r1013994555
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modules/transactions/src/main/java/org/apache/ignite/internal/tx/storage/state/TxStateTableStorage.java:
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@@ -78,4 +75,49 @@ public interface TxStateTableStorage extends AutoCloseable {
* @throws StorageException In case when the operation has failed.
*/
void destroy() throws StorageException;
+
+ /**
+ * Prepares the transaction state storage for rebalancing: makes a backup
of the current transaction state storage and creates a new
+ * storage.
+ *
+ * <p>This method must be called before every full rebalance of the
transaction state storage, so that in case of errors or cancellation
+ * of the full rebalance, we can restore the transaction state storage
from the backup.
+ *
+ * <p>Full rebalance will be completed when one of the methods is called:
+ * <ol>
+ * <li>{@link #abortRebalance(int)} - in case of a full rebalance
cancellation or failure, so that we can restore the transaction
+ * state storage from a backup;</li>
+ * <li>{@link #finishRebalance(int)} - in case of a successful full
rebalance, to remove the backup of the transaction state
+ * storage.</li>
+ * </ol>
+ *
+ * <p>Only modification of data in transaction state storage is allowed.
+ *
+ * @param partitionId Partition ID.
+ * @return Future, if completed without errors, then {@link
#getTxStateStorage} will return a new (empty) transaction state storage.
Review Comment:
`Future, if completed without errors, then {@link #getTxStateStorage} will
return write only (empty) transaction state storage.`
Fine ?
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