[iotdb] 01/01: do not add mods to cache when mods file does not exist

[ma...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

marklau99 pushed a commit to branch IOTDB-4225
in repository https://gitbox.apache.org/repos/asf/iotdb.git

commit c8a46920063b93917828f9818c1e62e16805b3c3
Author: Liu Xuxin <li...@outlook.com>
AuthorDate: Thu Aug 25 15:01:16 2022 +0800

    do not add mods to cache when mods file does not exist
---
 .../main/java/org/apache/iotdb/db/query/context/QueryContext.java    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/server/src/main/java/org/apache/iotdb/db/query/context/QueryContext.java b/server/src/main/java/org/apache/iotdb/db/query/context/QueryContext.java
index 5ce05c1816..1551a73274 100644
--- a/server/src/main/java/org/apache/iotdb/db/query/context/QueryContext.java
+++ b/server/src/main/java/org/apache/iotdb/db/query/context/QueryContext.java
@@ -27,6 +27,7 @@ import org.apache.iotdb.db.query.control.QueryTimeManager;
 import org.apache.iotdb.tsfile.file.metadata.IChunkMetadata;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -90,6 +91,10 @@ public class QueryContext {
    * them from 'modFile' and put then into the cache.
    */
   public List<Modification> getPathModifications(ModificationFile modFile, PartialPath path) {
+    // if the mods file does not exist, do not add it to the cache
+    if (!modFile.exists()) {
+      return Collections.emptyList();
+    }
     Map<String, List<Modification>> fileModifications =
         filePathModCache.computeIfAbsent(modFile.getFilePath(), k -> new ConcurrentHashMap<>());
     return fileModifications.computeIfAbsent(