ben-manes commented on code in PR #14243:
URL: https://github.com/apache/kafka/pull/14243#discussion_r1320630057
##########
storage/src/main/java/org/apache/kafka/storage/internals/log/RemoteIndexCache.java:
##########
@@ -110,27 +113,54 @@ public class RemoteIndexCache implements Closeable {
*
* We use {@link Caffeine} cache instead of implementing a thread safe LRU
cache on our own.
*/
- private final Cache<Uuid, Entry> internalCache;
- private final RemoteStorageManager remoteStorageManager;
- private final ShutdownableThread cleanerThread;
+ private Cache<Uuid, Entry> internalCache;
public RemoteIndexCache(RemoteStorageManager remoteStorageManager, String
logDir) throws IOException {
- this(1024, remoteStorageManager, logDir);
+ this(DEFAULT_REMOTE_INDEX_CACHE_SIZE_BYTES, remoteStorageManager,
logDir);
}
/**
* Creates RemoteIndexCache with the given configs.
*
- * @param maxSize maximum number of segment index entries to
be cached.
+ * @param maxSize maximum bytes size of segment index entries
to be cached.
* @param remoteStorageManager RemoteStorageManager instance, to be used
in fetching indexes.
* @param logDir log directory
*/
- public RemoteIndexCache(int maxSize, RemoteStorageManager
remoteStorageManager, String logDir) throws IOException {
+ public RemoteIndexCache(long maxSize, RemoteStorageManager
remoteStorageManager, String logDir) throws IOException {
this.remoteStorageManager = remoteStorageManager;
cacheDir = new File(logDir, DIR_NAME);
- internalCache = Caffeine.newBuilder()
- .maximumSize(maxSize)
+ internalCache = initEmptyCache(maxSize);
+ init();
+
+ // Start cleaner thread that will clean the expired entries.
+ cleanerThread = createCleanerThread();
+ cleanerThread.start();
+ }
+
+ public void resizeCacheSize(long remoteLogIndexFileCacheSize) {
+ lock.writeLock().lock();
+ try {
+ // When resizing the cache, we always start with an empty cache.
There are two main reasons:
+ // 1. Resizing the cache is not a high-frequency operation, and
there is no need to fill the data in the old
+ // cache to the new cache in time when resizing inside.
+ // 2. Since the eviction of the caffeine cache is cleared
asynchronously, it is possible that after the entry
+ // in the old cache is filled in the new cache, the old cache will
clear the entry, and the data in the two caches
+ // will be inconsistent.
+ internalCache.invalidateAll();
+ log.info("Invalidated all entries in the cache and triggered the
cleaning of all index files in the cache dir.");
+ internalCache = initEmptyCache(remoteLogIndexFileCacheSize);
Review Comment:
fyi, you could [dynamically
resize](https://www.javadoc.io/doc/com.github.ben-manes.caffeine/caffeine/latest/com.github.benmanes.caffeine/com/github/benmanes/caffeine/cache/Policy.Eviction.html#setMaximum(@org.checkerframework.checker.index.qual.NonNegativelong))
the cache instance, which will perform the eviction on the calling thread if
it exceeds the new maximum.
```java
cache.policy().eviction().orElseThrow().setMaximum(remoteLogIndexFileCacheSize);
```
The
[Policy](https://www.javadoc.io/doc/com.github.ben-manes.caffeine/caffeine/latest/com.github.benmanes.caffeine/com/github/benmanes/caffeine/cache/Policy.html)
api includes many helpful but ad hoc methods to solve problems, while also
letting us try to keep the top-level apis streamlined for the common usages.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
