mychaow commented on a change in pull request #1721:
URL: https://github.com/apache/iotdb/pull/1721#discussion_r542169540
##########
File path: server/src/main/java/org/apache/iotdb/db/writelog/io/LogWriter.java
##########
@@ -18,36 +18,59 @@
*/
package org.apache.iotdb.db.writelog.io;
+import org.apache.iotdb.db.engine.fileSystem.SystemFileFactory;
+import org.apache.iotdb.db.utils.TestOnly;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
import java.io.File;
+import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
+import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.util.zip.CRC32;
-import org.apache.iotdb.db.conf.IoTDBConfig;
-import org.apache.iotdb.db.conf.IoTDBDescriptor;
-import org.apache.iotdb.db.engine.fileSystem.SystemFileFactory;
/**
- * LogWriter writes the binarized logs into a file using FileChannel together
with check sums of
+ * LogWriter writes the binary logs into a file using FileChannel together
with check sums of
* each log calculated using CRC32.
*/
public class LogWriter implements ILogWriter {
+ private static final Logger logger =
LoggerFactory.getLogger(LogWriter.class);
private File logFile;
private FileOutputStream fileOutputStream;
private FileChannel channel;
- private CRC32 checkSummer = new CRC32();
- private IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig();
- private ByteBuffer lengthBuffer = ByteBuffer.allocate(4);
- private ByteBuffer checkSumBuffer = ByteBuffer.allocate(8);
+ private final CRC32 checkSummer = new CRC32();
+ private final ByteBuffer lengthBuffer = ByteBuffer.allocate(4);
+ private final ByteBuffer checkSumBuffer = ByteBuffer.allocate(8);
+ private final long forcePeriodInMs;
- public LogWriter(String logFilePath) {
+ /**
+ * @param logFilePath
+ * @param forcePeriodInMs
+ * @throws FileNotFoundException
+ */
+ @TestOnly
+ public LogWriter(String logFilePath, long forcePeriodInMs) throws
FileNotFoundException {
logFile = SystemFileFactory.INSTANCE.getFile(logFilePath);
+ this.forcePeriodInMs = forcePeriodInMs;
+
+ if (channel == null) {
+ fileOutputStream = new FileOutputStream(logFile, true);
+ channel = fileOutputStream.getChannel();
+ }
}
- public LogWriter(File logFile) {
+ public LogWriter(File logFile, long forcePeriodInMs) throws
FileNotFoundException {
Review comment:
Not that, wal use this to optimize the performance after hundreds of
milliseconds.
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