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Posted to commits@iotdb.apache.org by qi...@apache.org on 2020/04/14 07:46:35 UTC
[incubator-iotdb] 01/01: add comment for MetadataQuerierByFileImpl
This is an automated email from the ASF dual-hosted git repository.
qiaojialin pushed a commit to branch rename_metadata_querier
in repository https://gitbox.apache.org/repos/asf/incubator-iotdb.git
commit 7dcd88e8a040676746ce33867595af12ffe0714a
Author: qiaojialin <64...@qq.com>
AuthorDate: Tue Apr 14 15:44:43 2020 +0800
add comment for MetadataQuerierByFileImpl
---
.../iotdb/tsfile/read/controller/MetadataQuerierByFileImpl.java | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/tsfile/src/main/java/org/apache/iotdb/tsfile/read/controller/MetadataQuerierByFileImpl.java b/tsfile/src/main/java/org/apache/iotdb/tsfile/read/controller/MetadataQuerierByFileImpl.java
index 74714fa..aa86346 100644
--- a/tsfile/src/main/java/org/apache/iotdb/tsfile/read/controller/MetadataQuerierByFileImpl.java
+++ b/tsfile/src/main/java/org/apache/iotdb/tsfile/read/controller/MetadataQuerierByFileImpl.java
@@ -33,7 +33,8 @@ import java.util.*;
public class MetadataQuerierByFileImpl implements IMetadataQuerier {
- private static final int CHUNK_METADATA_CACHE_SIZE = 10000;
+ // number of cache entries (path -> List<ChunkMetadata>)
+ private static final int CACHED_ENTRY_NUMBER = 1000;
private TsFileMetadata fileMetaData;
@@ -47,7 +48,7 @@ public class MetadataQuerierByFileImpl implements IMetadataQuerier {
public MetadataQuerierByFileImpl(TsFileSequenceReader tsFileReader) throws IOException {
this.tsFileReader = tsFileReader;
this.fileMetaData = tsFileReader.readFileMetadata();
- chunkMetaDataCache = new LRUCache<Path, List<ChunkMetadata>>(CHUNK_METADATA_CACHE_SIZE) {
+ chunkMetaDataCache = new LRUCache<Path, List<ChunkMetadata>>(CACHED_ENTRY_NUMBER) {
@Override
public List<ChunkMetadata> loadObjectByKey(Path key) throws IOException {
return loadChunkMetadata(key);
@@ -131,7 +132,7 @@ public class MetadataQuerierByFileImpl implements IMetadataQuerier {
// check cache size, stop when reading enough
count++;
- if (count == CHUNK_METADATA_CACHE_SIZE) {
+ if (count == CACHED_ENTRY_NUMBER) {
enough = true;
break;
}