ChenSammi commented on a change in pull request #1147:
URL: https://github.com/apache/hadoop-ozone/pull/1147#discussion_r451408251
##########
File path:
hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/utils/ContainerCache.java
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@@ -117,28 +117,49 @@ public ReferenceCountedDB getDB(long containerID, String
containerDBType,
throws IOException {
Preconditions.checkState(containerID >= 0,
"Container ID cannot be negative.");
+ ReferenceCountedDB db;
lock.lock();
try {
- ReferenceCountedDB db = (ReferenceCountedDB) this.get(containerDBPath);
-
- if (db == null) {
- MetadataStore metadataStore =
- MetadataStoreBuilder.newBuilder()
- .setDbFile(new File(containerDBPath))
- .setCreateIfMissing(false)
- .setConf(conf)
- .setDBType(containerDBType)
- .build();
- db = new ReferenceCountedDB(metadataStore, containerDBPath);
- this.put(containerDBPath, db);
+ db = (ReferenceCountedDB) this.get(containerDBPath);
+ if (db != null) {
+ db.incrementReference();
+ return db;
}
- // increment the reference before returning the object
- db.incrementReference();
- return db;
+ } finally {
+ lock.unlock();
+ }
+
+ try {
+ MetadataStore metadataStore =
+ MetadataStoreBuilder.newBuilder()
+ .setDbFile(new File(containerDBPath))
+ .setCreateIfMissing(false)
+ .setConf(conf)
+ .setDBType(containerDBType)
+ .build();
Review comment:
@adoroszlai, OK, I get the point now. During the datanode
initialization phase, actually there is no change a DB will be opened
concurrently. But since this function is also used in late phase, there is
possibility to trigger the exception.
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