JackieTien97 commented on code in PR #12447:
URL: https://github.com/apache/iotdb/pull/12447#discussion_r1584008968
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagLogFile.java:
##########
@@ -95,22 +102,85 @@ public synchronized void copyTo(File targetFile) throws
IOException {
* @return tags map, attributes map
* @throws IOException error occurred when reading disk
*/
- public Pair<Map<String, String>, Map<String, String>> read(int size, long
position)
- throws IOException {
+ public Pair<Map<String, String>, Map<String, String>> read(long position)
throws IOException {
if (position < 0) {
return new Pair<>(Collections.emptyMap(), Collections.emptyMap());
}
- ByteBuffer byteBuffer = ByteBuffer.allocate(size);
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ }
+
+ public Map<String, String> readTag(long position) throws IOException {
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return ReadWriteIOUtils.readMap(byteBuffer);
+ }
+
+ public static ByteBuffer parseByteBuffer(FileChannel fileChannel, long
position)
+ throws IOException {
+ // Read the first block
+ ByteBuffer byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
fileChannel.read(byteBuffer, position);
byteBuffer.flip();
- return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ if (byteBuffer.limit() > 0) { // This indicates that there is data at this
position
+ int firstInt = ReadWriteIOUtils.readInt(byteBuffer); // first int
+ byteBuffer.position(0);
+ if (firstInt < -1) { // This position is blockNum, the original data
occupies multiple blocks
+ int blockNum = -firstInt;
+ ByteBuffer byteBuffers = ByteBuffer.allocate(blockNum * MAX_LENGTH);
+ byteBuffers.put(byteBuffer);
+ byteBuffers.position(4); // Skip blockNum
+ List<Long> blockOffset = new ArrayList<>();
+ blockOffset.add(position);
+ for (int i = 1; i < blockNum; i++) {
+ blockOffset.add(ReadWriteIOUtils.readLong(byteBuffers));
+ // read one offset, then use filechannel's read to read it
+ byteBuffers.position(MAX_LENGTH * i);
+ byteBuffers.limit(MAX_LENGTH * (i + 1));
+ fileChannel.read(byteBuffers, blockOffset.get(i));
+ byteBuffers.position(4 + i * Long.BYTES);
+ }
+ byteBuffers.limit(byteBuffers.capacity());
+ return byteBuffers;
+ }
+ }
+ return byteBuffer;
}
- public Map<String, String> readTag(int size, long position) throws
IOException {
- ByteBuffer byteBuffer = ByteBuffer.allocate(size);
+ private List<Long> ParseOffsetList(long position) throws IOException {
+ List<Long> blockOffset = new ArrayList<>();
+ blockOffset.add(position);
+ // Read the first block
+ ByteBuffer byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
fileChannel.read(byteBuffer, position);
byteBuffer.flip();
- return ReadWriteIOUtils.readMap(byteBuffer);
+ if (byteBuffer.limit() > 0) { // This indicates that there is data at this
position
+ int firstInt = ReadWriteIOUtils.readInt(byteBuffer); // first int
+ byteBuffer.position(0);
+ if (firstInt < -1) { // This position is blockNum, the original data
occupies multiple blocks
+ int blockNum = -firstInt;
+ int blockOffsetStoreLen =
+ (((blockNum - 1) * Long.BYTES + 4) / MAX_LENGTH + 1)
+ * MAX_LENGTH; // blockOffset storage length
+ ByteBuffer blockBuffer = ByteBuffer.allocate(blockOffsetStoreLen);
+ blockBuffer.put(byteBuffer);
+ blockBuffer.position(4); // Skip blockNum
+
+ for (int i = 1; i < blockNum; i++) {
+ blockOffset.add(ReadWriteIOUtils.readLong(blockBuffer));
+ // Every time you read an offset, use filechannel's read to read it
+ if (MAX_LENGTH * (i + 1)
+ <= blockOffsetStoreLen) { // Compared with directly reading
bytebuffer, some reading
+ // operations are reduced, only the content of offset is
+ // read
+ blockBuffer.position(MAX_LENGTH * i);
+ blockBuffer.limit(MAX_LENGTH * (i + 1));
+ fileChannel.read(blockBuffer, blockOffset.get(i));
+ blockBuffer.position(4 + i * Long.BYTES);
+ }
+ }
Review Comment:
You've already read all the first block content into memory in previous
`fileChannel.read(byteBuffer, position);`
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagLogFile.java:
##########
@@ -95,22 +102,85 @@ public synchronized void copyTo(File targetFile) throws
IOException {
* @return tags map, attributes map
* @throws IOException error occurred when reading disk
*/
- public Pair<Map<String, String>, Map<String, String>> read(int size, long
position)
- throws IOException {
+ public Pair<Map<String, String>, Map<String, String>> read(long position)
throws IOException {
if (position < 0) {
return new Pair<>(Collections.emptyMap(), Collections.emptyMap());
}
- ByteBuffer byteBuffer = ByteBuffer.allocate(size);
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ }
+
+ public Map<String, String> readTag(long position) throws IOException {
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return ReadWriteIOUtils.readMap(byteBuffer);
+ }
+
+ public static ByteBuffer parseByteBuffer(FileChannel fileChannel, long
position)
+ throws IOException {
+ // Read the first block
+ ByteBuffer byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
fileChannel.read(byteBuffer, position);
byteBuffer.flip();
- return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ if (byteBuffer.limit() > 0) { // This indicates that there is data at this
position
+ int firstInt = ReadWriteIOUtils.readInt(byteBuffer); // first int
+ byteBuffer.position(0);
+ if (firstInt < -1) { // This position is blockNum, the original data
occupies multiple blocks
+ int blockNum = -firstInt;
+ ByteBuffer byteBuffers = ByteBuffer.allocate(blockNum * MAX_LENGTH);
+ byteBuffers.put(byteBuffer);
+ byteBuffers.position(4); // Skip blockNum
+ List<Long> blockOffset = new ArrayList<>();
+ blockOffset.add(position);
Review Comment:
no need to save offset in a list, read it, use it then gc it.
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagManager.java:
##########
@@ -171,10 +206,29 @@ public void addIndex(Map<String, String> tagsMap,
IMeasurementMNode<?> measureme
}
public void removeIndex(String tagKey, String tagValue, IMeasurementMNode<?>
measurementMNode) {
- tagIndex.get(tagKey).get(tagValue).remove(measurementMNode);
+ if (tagKey == null || tagValue == null || measurementMNode == null) {
+ return;
+ }
+ // init memory size
+ int memorySize = 0;
+ if (tagIndex.get(tagKey).get(tagValue).remove(measurementMNode)) {
+ memorySize += 8;
+ }
if (tagIndex.get(tagKey).get(tagValue).isEmpty()) {
- tagIndex.get(tagKey).remove(tagValue);
+ if (tagIndex.get(tagKey).remove(tagValue) != null) {
+ // 4 is the memory occupied by the length of the string,
tagValue.length() is the length of
+ // tagValue, and the last 4 is the memory occupied by the size of
IMeasurementMNodeSet
+ memorySize += 4 + tagValue.length() + 4;
+ }
+ }
+ if (tagIndex.get(tagKey).isEmpty()) {
+ if (tagIndex.remove(tagKey) != null) {
+ // 4 is the memory occupied by the length of the string,
tagKey.length() is the length of
+ // tagKey, and the last 4 is the memory occupied by the size of
tagValueMap
+ memorySize += 4 + tagKey.length() + 4;
+ }
Review Comment:
same as above.
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagLogFile.java:
##########
@@ -137,11 +207,84 @@ public void write(Map<String, String> tagMap, Map<String,
String> attributeMap,
* @return beginning position of the record in tagFile
*/
private synchronized long write(ByteBuffer byteBuffer, long position) throws
IOException {
+ // Correct the initial offset of the write
if (position < 0) {
// append the record to file tail
position = fileChannel.size();
}
- fileChannel.write(byteBuffer, position);
+ // Read the original data to get the original space offset
+ List<Long> blockOffset = ParseOffsetList(position);
+ // write read data
+ int blockNumReal = byteBuffer.capacity() / MAX_LENGTH;
+ if (blockNumReal < 1) {
+ throw new RuntimeException(
+ "ByteBuffer capacity is smaller than tagAttributeTotalSize, which is
not allowed.");
+ }
+ if (blockNumReal == 1 && blockOffset.size() == 1) {
+ // If the original data occupies only one block and the new data
occupies only one block, the
+ // original space is used
+ fileChannel.write(byteBuffer, blockOffset.get(0));
+ } else {
+ if (blockOffset.size()
+ > blockNumReal) { // if the original space is larger than the new
space, the original
Review Comment:
`>=` or `>`?
##########
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/conf/CommonConfig.java:
##########
@@ -251,6 +251,8 @@ public class CommonConfig {
// Max size for tag and attribute of one time series
private int tagAttributeTotalSize = 700;
+ private int tagAttributeEachMaxNum = 20;
+ private int tagAttributeEachMaxSize = 100;
Review Comment:
Add all of these two config into iotdb-common.properties in
`iotdb-core/node-commons/src/assembly/resources/conf/iotdb-common.properties`
and load these two in `CommonDescriptor.loadCommonProps`.
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagManager.java:
##########
@@ -156,10 +164,37 @@ public void addIndex(String tagKey, String tagValue,
IMeasurementMNode<?> measur
if (tagKey == null || tagValue == null || measurementMNode == null) {
return;
}
- tagIndex
- .computeIfAbsent(tagKey, k -> new ConcurrentHashMap<>())
- .computeIfAbsent(tagValue, v -> Collections.synchronizedSet(new
HashSet<>()))
- .add(measurementMNode);
+
+ int tagIndexOldSize = tagIndex.size();
+ Map<String, Set<IMeasurementMNode<?>>> tagValueMap =
+ tagIndex.computeIfAbsent(tagKey, k -> new ConcurrentHashMap<>());
+ int tagIndexNewSize = tagIndex.size();
+
+ int tagValueMapOldSize = tagValueMap.size();
+ Set<IMeasurementMNode<?>> measurementsSet =
+ tagValueMap.computeIfAbsent(tagValue, v ->
Collections.synchronizedSet(new HashSet<>()));
+ int tagValueMapNewSize = tagValueMap.size();
+
+ int measurementsSetOldSize = measurementsSet.size();
+ measurementsSet.add(measurementMNode);
+ int measurementsSetNewSize = measurementsSet.size();
+
+ int memorySize = 0;
+ if (tagIndexNewSize - tagIndexOldSize == 1) {
+ // 4 is the memory occupied by the length of the string, tagKey.length()
is the length of
+ // tagKey, and the last 4 is the memory occupied by the size of
tagvaluemap
+ memorySize += 4 + tagKey.length() + 4;
+ }
+ if (tagValueMapNewSize - tagValueMapOldSize == 1) {
+ // 4 is the memory occupied by the length of the string,
tagValue.length() is the length of
+ // tagValue, and the last 4 is the memory occupied by the size of
measurementsSet
+ memorySize += 4 + tagValue.length() + 4;
Review Comment:
same as above.
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagManager.java:
##########
@@ -156,10 +164,37 @@ public void addIndex(String tagKey, String tagValue,
IMeasurementMNode<?> measur
if (tagKey == null || tagValue == null || measurementMNode == null) {
return;
}
- tagIndex
- .computeIfAbsent(tagKey, k -> new ConcurrentHashMap<>())
- .computeIfAbsent(tagValue, v -> Collections.synchronizedSet(new
HashSet<>()))
- .add(measurementMNode);
+
+ int tagIndexOldSize = tagIndex.size();
+ Map<String, Set<IMeasurementMNode<?>>> tagValueMap =
+ tagIndex.computeIfAbsent(tagKey, k -> new ConcurrentHashMap<>());
+ int tagIndexNewSize = tagIndex.size();
+
+ int tagValueMapOldSize = tagValueMap.size();
+ Set<IMeasurementMNode<?>> measurementsSet =
+ tagValueMap.computeIfAbsent(tagValue, v ->
Collections.synchronizedSet(new HashSet<>()));
+ int tagValueMapNewSize = tagValueMap.size();
+
+ int measurementsSetOldSize = measurementsSet.size();
+ measurementsSet.add(measurementMNode);
+ int measurementsSetNewSize = measurementsSet.size();
+
+ int memorySize = 0;
+ if (tagIndexNewSize - tagIndexOldSize == 1) {
+ // 4 is the memory occupied by the length of the string, tagKey.length()
is the length of
+ // tagKey, and the last 4 is the memory occupied by the size of
tagvaluemap
+ memorySize += 4 + tagKey.length() + 4;
Review Comment:
call `RamUsageEstimator.sizeOf(tagKey)` to directly get memory usage of
String object.
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagLogFile.java:
##########
@@ -95,22 +102,85 @@ public synchronized void copyTo(File targetFile) throws
IOException {
* @return tags map, attributes map
* @throws IOException error occurred when reading disk
*/
- public Pair<Map<String, String>, Map<String, String>> read(int size, long
position)
- throws IOException {
+ public Pair<Map<String, String>, Map<String, String>> read(long position)
throws IOException {
if (position < 0) {
return new Pair<>(Collections.emptyMap(), Collections.emptyMap());
}
- ByteBuffer byteBuffer = ByteBuffer.allocate(size);
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ }
+
+ public Map<String, String> readTag(long position) throws IOException {
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return ReadWriteIOUtils.readMap(byteBuffer);
+ }
+
+ public static ByteBuffer parseByteBuffer(FileChannel fileChannel, long
position)
+ throws IOException {
+ // Read the first block
+ ByteBuffer byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
fileChannel.read(byteBuffer, position);
byteBuffer.flip();
- return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ if (byteBuffer.limit() > 0) { // This indicates that there is data at this
position
+ int firstInt = ReadWriteIOUtils.readInt(byteBuffer); // first int
+ byteBuffer.position(0);
+ if (firstInt < -1) { // This position is blockNum, the original data
occupies multiple blocks
+ int blockNum = -firstInt;
+ ByteBuffer byteBuffers = ByteBuffer.allocate(blockNum * MAX_LENGTH);
+ byteBuffers.put(byteBuffer);
+ byteBuffers.position(4); // Skip blockNum
+ List<Long> blockOffset = new ArrayList<>();
+ blockOffset.add(position);
+ for (int i = 1; i < blockNum; i++) {
+ blockOffset.add(ReadWriteIOUtils.readLong(byteBuffers));
+ // read one offset, then use filechannel's read to read it
+ byteBuffers.position(MAX_LENGTH * i);
+ byteBuffers.limit(MAX_LENGTH * (i + 1));
+ fileChannel.read(byteBuffers, blockOffset.get(i));
+ byteBuffers.position(4 + i * Long.BYTES);
+ }
+ byteBuffers.limit(byteBuffers.capacity());
+ return byteBuffers;
+ }
+ }
+ return byteBuffer;
}
- public Map<String, String> readTag(int size, long position) throws
IOException {
- ByteBuffer byteBuffer = ByteBuffer.allocate(size);
+ private List<Long> ParseOffsetList(long position) throws IOException {
Review Comment:
```suggestion
private List<Long> parseOffsetList(long position) throws IOException {
```
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagManager.java:
##########
@@ -711,9 +746,24 @@ public Map<String, String> readTags(IMeasurementMNode<?>
node) {
public void clear() throws IOException {
this.tagIndex.clear();
+ releaseMemory((int) memoryUsage.get());
Review Comment:
before `TagManager.clear()` is called, the `this.regionStatistics.clear();`
is already called in `SchemaRegionXXXXImpl`
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagManager.java:
##########
@@ -156,10 +164,37 @@ public void addIndex(String tagKey, String tagValue,
IMeasurementMNode<?> measur
if (tagKey == null || tagValue == null || measurementMNode == null) {
return;
}
- tagIndex
- .computeIfAbsent(tagKey, k -> new ConcurrentHashMap<>())
- .computeIfAbsent(tagValue, v -> Collections.synchronizedSet(new
HashSet<>()))
- .add(measurementMNode);
+
+ int tagIndexOldSize = tagIndex.size();
+ Map<String, Set<IMeasurementMNode<?>>> tagValueMap =
+ tagIndex.computeIfAbsent(tagKey, k -> new ConcurrentHashMap<>());
+ int tagIndexNewSize = tagIndex.size();
+
+ int tagValueMapOldSize = tagValueMap.size();
+ Set<IMeasurementMNode<?>> measurementsSet =
+ tagValueMap.computeIfAbsent(tagValue, v ->
Collections.synchronizedSet(new HashSet<>()));
+ int tagValueMapNewSize = tagValueMap.size();
+
+ int measurementsSetOldSize = measurementsSet.size();
+ measurementsSet.add(measurementMNode);
+ int measurementsSetNewSize = measurementsSet.size();
+
+ int memorySize = 0;
+ if (tagIndexNewSize - tagIndexOldSize == 1) {
+ // 4 is the memory occupied by the length of the string, tagKey.length()
is the length of
+ // tagKey, and the last 4 is the memory occupied by the size of
tagvaluemap
+ memorySize += 4 + tagKey.length() + 4;
+ }
+ if (tagValueMapNewSize - tagValueMapOldSize == 1) {
+ // 4 is the memory occupied by the length of the string,
tagValue.length() is the length of
+ // tagValue, and the last 4 is the memory occupied by the size of
measurementsSet
+ memorySize += 4 + tagValue.length() + 4;
+ }
+ if (measurementsSetNewSize - measurementsSetOldSize == 1) {
+ // 8 is the memory occupied by the length of the IMeasurementMNode
+ memorySize += 8;
Review Comment:
use `RamUsageEstimator .NUM_BYTES_OBJECT_REF` to represent object reference
memory usgae.
##########
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/conf/CommonConfig.java:
##########
@@ -251,6 +251,8 @@ public class CommonConfig {
// Max size for tag and attribute of one time series
private int tagAttributeTotalSize = 700;
+ private int tagAttributeEachMaxNum = 20;
+ private int tagAttributeEachMaxSize = 100;
Review Comment:
also remember to change the comments about `tag_attribute_total_size` in
`iotdb-core/node-commons/src/assembly/resources/conf/iotdb-common.properties`
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagLogFile.java:
##########
@@ -95,22 +102,85 @@ public synchronized void copyTo(File targetFile) throws
IOException {
* @return tags map, attributes map
* @throws IOException error occurred when reading disk
*/
- public Pair<Map<String, String>, Map<String, String>> read(int size, long
position)
- throws IOException {
+ public Pair<Map<String, String>, Map<String, String>> read(long position)
throws IOException {
if (position < 0) {
return new Pair<>(Collections.emptyMap(), Collections.emptyMap());
}
- ByteBuffer byteBuffer = ByteBuffer.allocate(size);
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ }
+
+ public Map<String, String> readTag(long position) throws IOException {
+ ByteBuffer byteBuffer = parseByteBuffer(fileChannel, position);
+ return ReadWriteIOUtils.readMap(byteBuffer);
+ }
+
+ public static ByteBuffer parseByteBuffer(FileChannel fileChannel, long
position)
+ throws IOException {
+ // Read the first block
+ ByteBuffer byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
fileChannel.read(byteBuffer, position);
byteBuffer.flip();
- return new Pair<>(ReadWriteIOUtils.readMap(byteBuffer),
ReadWriteIOUtils.readMap(byteBuffer));
+ if (byteBuffer.limit() > 0) { // This indicates that there is data at this
position
+ int firstInt = ReadWriteIOUtils.readInt(byteBuffer); // first int
+ byteBuffer.position(0);
+ if (firstInt < -1) { // This position is blockNum, the original data
occupies multiple blocks
+ int blockNum = -firstInt;
+ ByteBuffer byteBuffers = ByteBuffer.allocate(blockNum * MAX_LENGTH);
+ byteBuffers.put(byteBuffer);
+ byteBuffers.position(4); // Skip blockNum
+ List<Long> blockOffset = new ArrayList<>();
+ blockOffset.add(position);
+ for (int i = 1; i < blockNum; i++) {
+ blockOffset.add(ReadWriteIOUtils.readLong(byteBuffers));
+ // read one offset, then use filechannel's read to read it
+ byteBuffers.position(MAX_LENGTH * i);
+ byteBuffers.limit(MAX_LENGTH * (i + 1));
+ fileChannel.read(byteBuffers, blockOffset.get(i));
+ byteBuffers.position(4 + i * Long.BYTES);
+ }
+ byteBuffers.limit(byteBuffers.capacity());
+ return byteBuffers;
Review Comment:
it seems that you need to call `byteBuffer.flip();`
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagLogFile.java:
##########
@@ -152,15 +295,69 @@ private synchronized long write(ByteBuffer byteBuffer,
long position) throws IOE
private ByteBuffer convertMapToByteBuffer(
Map<String, String> tagMap, Map<String, String> attributeMap) throws
MetadataException {
- ByteBuffer byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
+ int TotalMapSize = calculateMapSize(tagMap) +
calculateMapSize(attributeMap);
Review Comment:
```suggestion
int totalMapSize = calculateMapSize(tagMap) +
calculateMapSize(attributeMap);
```
##########
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagLogFile.java:
##########
@@ -152,15 +295,69 @@ private synchronized long write(ByteBuffer byteBuffer,
long position) throws IOE
private ByteBuffer convertMapToByteBuffer(
Map<String, String> tagMap, Map<String, String> attributeMap) throws
MetadataException {
- ByteBuffer byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
+ int TotalMapSize = calculateMapSize(tagMap) +
calculateMapSize(attributeMap);
+ ByteBuffer byteBuffer;
+ if (TotalMapSize <= MAX_LENGTH) {
+ byteBuffer = ByteBuffer.allocate(MAX_LENGTH);
+ } else {
+ // get from Num*MAX_LENGTH < TotalMapSize + 4 + Long.BYTES*Num <=
MAX_LENGTH*(Num + 1)
Review Comment:
why not `Num*MAX_LENGTH <= TotalMapSize + 4 + Long.BYTES*Num`?
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