hanishakoneru commented on a change in pull request #956: HDDS-1638. Implement
Key Write Requests to use Cache and DoubleBuffer.
URL: https://github.com/apache/hadoop/pull/956#discussion_r297854705
##########
File path:
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OmMetadataManagerImpl.java
##########
@@ -495,12 +495,27 @@ public boolean isVolumeEmpty(String volume) throws
IOException {
public boolean isBucketEmpty(String volume, String bucket)
throws IOException {
String keyPrefix = getBucketKey(volume, bucket);
- //TODO: When Key ops are converted in to HA model, use cache also to
- // determine bucket is empty or not.
+
+ // First check in key table cache.
+ Iterator<Map.Entry<CacheKey<String>, CacheValue<OmKeyInfo>>> iterator =
+ ((TypedTable< String, OmKeyInfo>) keyTable).cacheIterator();
+ while (iterator.hasNext()) {
+ Map.Entry< CacheKey<String>, CacheValue<OmKeyInfo>> entry =
+ iterator.next();
+ String key = entry.getKey().getCacheKey();
+ OmKeyInfo omKeyInfo = entry.getValue().getCacheValue();
+ // Making sure that entry is not for delete key request.
+ if (key.startsWith(keyPrefix) && omKeyInfo != null) {
+ return false;
+ }
+ }
try (TableIterator<String, ? extends KeyValue<String, OmKeyInfo>> keyIter =
keyTable.iterator()) {
KeyValue<String, OmKeyInfo> kv = keyIter.seek(keyPrefix);
- if (kv != null && kv.getKey().startsWith(keyPrefix)) {
+ // During iteration from DB, check in mean time if this key is not
+ // marked for delete.
+ if (kv != null && kv.getKey().startsWith(keyPrefix) &&
+ keyTable.get(kv.getKey()) != null) {
Review comment:
We would have to check the cache to not count the keys which are marked for
delete.
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