Prune all blocks up until the blockPruneLimit

By default, this leaves only the last 1450 blocks in the database. Only applies when pruning mode is enabled.

src/main/java/org/qortal/controller/pruning/BlockPruner.java

@@ -0,0 +1,86 @@
+package org.qortal.controller.pruning;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.qortal.controller.Controller;
+import org.qortal.data.block.BlockData;
+import org.qortal.repository.DataException;
+import org.qortal.repository.Repository;
+import org.qortal.repository.RepositoryManager;
+import org.qortal.settings.Settings;
+import org.qortal.utils.NTP;
+
+public class BlockPruner implements Runnable {
+
+	private static final Logger LOGGER = LogManager.getLogger(BlockPruner.class);
+
+	@Override
+	public void run() {
+		Thread.currentThread().setName("Block pruner");
+
+		if (!Settings.getInstance().isPruningEnabled()) {
+			return;
+		}
+
+		try (final Repository repository = RepositoryManager.getRepository()) {
+			int pruneStartHeight = repository.getBlockRepository().getBlockPruneHeight();
+
+			while (!Controller.isStopping()) {
+				repository.discardChanges();
+
+				Thread.sleep(Settings.getInstance().getBlockPruneInterval());
+
+				BlockData chainTip = Controller.getInstance().getChainTip();
+				if (chainTip == null || NTP.getTime() == null)
+					continue;
+
+				// Don't even attempt if we're mid-sync as our repository requests will be delayed for ages
+				if (Controller.getInstance().isSynchronizing())
+					continue;
+
+				// Prune all blocks up until our latest minus pruneBlockLimit
+				final int ourLatestHeight = chainTip.getHeight();
+				final int upperPrunableHeight = ourLatestHeight - Settings.getInstance().getPruneBlockLimit();
+
+				int upperBatchHeight = pruneStartHeight + Settings.getInstance().getBlockPruneBatchSize();
+				int upperPruneHeight = Math.min(upperBatchHeight, upperPrunableHeight);
+
+				if (pruneStartHeight >= upperPruneHeight) {
+					continue;
+				}
+
+				LOGGER.debug(String.format("Pruning blocks between %d and %d...", pruneStartHeight, upperPruneHeight));
+
+				int numBlocksPruned = repository.getBlockRepository().pruneBlocks(pruneStartHeight, upperPruneHeight);
+				repository.saveChanges();
+
+				if (numBlocksPruned > 0) {
+					final int finalPruneStartHeight = pruneStartHeight;
+					LOGGER.debug(() -> String.format("Pruned %d block%s between %d and %d",
+							numBlocksPruned, (numBlocksPruned != 1 ? "s" : ""),
+							finalPruneStartHeight, upperPruneHeight));
+				} else {
+					// Can we move onto next batch?
+					if (upperPrunableHeight > upperBatchHeight) {
+						pruneStartHeight = upperBatchHeight;
+						repository.getBlockRepository().setBlockPruneHeight(pruneStartHeight);
+						repository.saveChanges();
+
+						final int finalPruneStartHeight = pruneStartHeight;
+						LOGGER.debug(() -> String.format("Bumping block base prune height to %d", finalPruneStartHeight));
+					}
+					else {
+						// We've pruned up to the upper prunable height
+						// Back off for a while to save CPU for syncing
+						Thread.sleep(10*60*1000L);
+					}
+				}
+			}
+		} catch (DataException e) {
+			LOGGER.warn(String.format("Repository issue trying to prune blocks: %s", e.getMessage()));
+		} catch (InterruptedException e) {
+			// Time to exit
+		}
+	}
+
+}

src/main/java/org/qortal/controller/pruning/PruneManager.java

@@ -23,6 +23,7 @@ public class PruneManager {
         // Start individual pruning processes
         ExecutorService pruneExecutor = Executors.newCachedThreadPool(new DaemonThreadFactory());
         pruneExecutor.execute(new AtStatesPruner());
+        pruneExecutor.execute(new BlockPruner());
     }
 
     public static synchronized PruneManager getInstance() {

src/main/java/org/qortal/repository/BlockRepository.java

@@ -166,6 +166,20 @@ public interface BlockRepository {
 	 */
 	public BlockData getDetachedBlockSignature(int startHeight) throws DataException;
 
+
+	/** Returns height of first prunable block. */
+	public int getBlockPruneHeight() throws DataException;
+
+	/** Sets new base height for block pruning.
+	 * <p>
+	 * NOTE: performs implicit <tt>repository.saveChanges()</tt>.
+	 */
+	public void setBlockPruneHeight(int pruneHeight) throws DataException;
+
+	/** Prunes full block data between passed heights. Returns number of pruned rows. */
+	public int pruneBlocks(int minHeight, int maxHeight) throws DataException;
+
+
 	/**
 	 * Saves block into repository.
 	 * 

src/main/java/org/qortal/repository/hsqldb/HSQLDBBlockRepository.java

@@ -509,6 +509,53 @@ public class HSQLDBBlockRepository implements BlockRepository {
 		}
 	}
 
+
+	@Override
+	public int getBlockPruneHeight() throws DataException {
+		String sql = "SELECT block_prune_height FROM DatabaseInfo";
+
+		try (ResultSet resultSet = this.repository.checkedExecute(sql)) {
+			if (resultSet == null)
+				return 0;
+
+			return resultSet.getInt(1);
+		} catch (SQLException e) {
+			throw new DataException("Unable to fetch block prune height from repository", e);
+		}
+	}
+
+	@Override
+	public void setBlockPruneHeight(int pruneHeight) throws DataException {
+		// trimHeightsLock is to prevent concurrent update on DatabaseInfo
+		// that could result in "transaction rollback: serialization failure"
+		synchronized (this.repository.trimHeightsLock) {
+			String updateSql = "UPDATE DatabaseInfo SET block_prune_height = ?";
+
+			try {
+				this.repository.executeCheckedUpdate(updateSql, pruneHeight);
+				this.repository.saveChanges();
+			} catch (SQLException e) {
+				repository.examineException(e);
+				throw new DataException("Unable to set block prune height in repository", e);
+			}
+		}
+	}
+
+	@Override
+	public int pruneBlocks(int minHeight, int maxHeight) throws DataException {
+		// Don't prune the genesis block
+		if (minHeight <= 1) {
+			minHeight = 2;
+		}
+
+		try {
+			return this.repository.delete("Blocks", "height BETWEEN ? AND ?", minHeight, maxHeight);
+		} catch (SQLException e) {
+			throw new DataException("Unable to prune blocks from repository", e);
+		}
+	}
+
+
 	@Override
 	public BlockData getDetachedBlockSignature(int startHeight) throws DataException {
 		String sql = "SELECT " + BLOCK_DB_COLUMNS + " FROM Blocks "

src/main/java/org/qortal/repository/hsqldb/HSQLDBDatabaseUpdates.java

@@ -870,6 +870,7 @@ public class HSQLDBDatabaseUpdates {
 				case 35:
 					// Support for pruning
 					stmt.execute("ALTER TABLE DatabaseInfo ADD AT_prune_height INT NOT NULL DEFAULT 0");
+					stmt.execute("ALTER TABLE DatabaseInfo ADD block_prune_height INT NOT NULL DEFAULT 0");
 					break;
 
 				default:

src/main/java/org/qortal/settings/Settings.java

@@ -106,24 +106,32 @@ public class Settings {
 	/** Max number of AT states to trim in one go. */
 	private int atStatesTrimLimit = 4000; // records
 
-	/** Whether we should prune old data to reduce database size
-	 * This prevents the node from being able to serve older blocks */
-	private boolean pruningEnabled = false;
-	/** The amount of recent blocks we should keep when pruning */
-	private int pruneBlockLimit = 1440;
-
-	/** How often to attempt AT state pruning (ms). */
-	private long atStatesPruneInterval = 3219L; // milliseconds
-	/** Block height range to scan for trimmable AT states.<br>
-	 * This has a significant effect on execution time. */
-	private int atStatesPruneBatchSize = 10; // blocks
-
 	/** How often to attempt online accounts signatures trimming (ms). */
 	private long onlineSignaturesTrimInterval = 9876L; // milliseconds
 	/** Block height range to scan for trimmable online accounts signatures.<br>
 	 * This has a significant effect on execution time. */
 	private int onlineSignaturesTrimBatchSize = 100; // blocks
 
+
+	/** Whether we should prune old data to reduce database size
+	 * This prevents the node from being able to serve older blocks */
+	private boolean pruningEnabled = false;
+	/** The amount of recent blocks we should keep when pruning */
+	private int pruneBlockLimit = 1450;
+
+	/** How often to attempt AT state pruning (ms). */
+	private long atStatesPruneInterval = 3219L; // milliseconds
+	/** Block height range to scan for prunable AT states.<br>
+	 * This has a significant effect on execution time. */
+	private int atStatesPruneBatchSize = 10; // blocks
+
+	/** How often to attempt block pruning (ms). */
+	private long blockPruneInterval = 3219L; // milliseconds
+	/** Block height range to scan for prunable blocks.<br>
+	 * This has a significant effect on execution time. */
+	private int blockPruneBatchSize = 10000; // blocks
+
+
 	// Peer-to-peer related
 	private boolean isTestNet = false;
 	/** Port number for inbound peer-to-peer connections. */
@@ -540,6 +548,15 @@ public class Settings {
 		return this.atStatesTrimLimit;
 	}
 
+	public long getOnlineSignaturesTrimInterval() {
+		return this.onlineSignaturesTrimInterval;
+	}
+
+	public int getOnlineSignaturesTrimBatchSize() {
+		return this.onlineSignaturesTrimBatchSize;
+	}
+
+
 	public boolean isPruningEnabled() {
 		return this.pruningEnabled;
 	}
@@ -556,12 +573,12 @@ public class Settings {
 		return this.atStatesPruneBatchSize;
 	}
 
-	public long getOnlineSignaturesTrimInterval() {
+	public long getBlockPruneInterval() {
-		return this.onlineSignaturesTrimInterval;
+		return this.blockPruneInterval;
 	}
 
-	public int getOnlineSignaturesTrimBatchSize() {
+	public int getBlockPruneBatchSize() {
-		return this.onlineSignaturesTrimBatchSize;
+		return this.blockPruneBatchSize;
 	}
 
 }