yuqi1129 commented on a change in pull request #1727:
URL: https://github.com/apache/incubator-iotdb/pull/1727#discussion_r488599312
##########
File path:
server/src/main/java/org/apache/iotdb/db/writelog/io/SingleFileLogReader.java
##########
@@ -53,54 +54,69 @@
private boolean fileCorrupted = false;
+ private boolean hasNext = false;
+
public SingleFileLogReader(File logFile) throws FileNotFoundException {
open(logFile);
}
@Override
public boolean hasNext() {
- try {
- if (batchLogReader != null && batchLogReader.hasNext()) {
- return true;
- }
-
- if (logStream.available() < LEAST_LOG_SIZE) {
- return false;
- }
- int logSize = logStream.readInt();
- if (logSize <= 0) {
- return false;
- }
- buffer = new byte[logSize];
+ if (Objects.nonNull(batchLogReader)) {
Review comment:
Yes, if `hasNext()` should be called, there is not need to make any
changes here
##########
File path:
server/src/main/java/org/apache/iotdb/db/writelog/io/SingleFileLogReader.java
##########
@@ -53,54 +54,69 @@
private boolean fileCorrupted = false;
+ private boolean hasNext = false;
+
public SingleFileLogReader(File logFile) throws FileNotFoundException {
open(logFile);
}
@Override
public boolean hasNext() {
- try {
- if (batchLogReader != null && batchLogReader.hasNext()) {
- return true;
- }
-
- if (logStream.available() < LEAST_LOG_SIZE) {
- return false;
- }
- int logSize = logStream.readInt();
- if (logSize <= 0) {
- return false;
- }
- buffer = new byte[logSize];
+ if (Objects.nonNull(batchLogReader)) {
+ hasNext = batchLogReader.hasNext();
- int readLen = logStream.read(buffer, 0, logSize);
- if (readLen < logSize) {
- throw new IOException("Reach eof");
+ if (hasNext) {
+ return hasNext;
}
+ }
- final long checkSum = logStream.readLong();
- checkSummer.reset();
- checkSummer.update(buffer, 0, logSize);
- if (checkSummer.getValue() != checkSum) {
- throw new IOException(String.format("The check sum of the No.%d log
batch is incorrect! In "
- + "file: "
- + "%d Calculated: %d.", idx, checkSum, checkSummer.getValue()));
+ try {
+ while (logStream.available() > LEAST_LOG_SIZE) {
Review comment:
if `batchLogReader ` is null, then we should find a position in
logStream where we create BatchLogReader and make `hasNext()` is true
repeatedly, it's in fact a loop
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