ankitsultana commented on code in PR #10108:
URL: https://github.com/apache/pinot/pull/10108#discussion_r1087494527
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/mailbox/GrpcMailboxService.java:
##########
@@ -44,16 +48,17 @@
* </ul>
*/
public class GrpcMailboxService implements MailboxService<TransferableBlock> {
+ private static final Duration MAILBOX_CACHE_EXPIRY = Duration.ofMinutes(5);
// channel manager
private final ChannelManager _channelManager;
private final String _hostname;
private final int _mailboxPort;
// maintaining a list of registered mailboxes.
- private final ConcurrentHashMap<String, ReceivingMailbox<TransferableBlock>>
_receivingMailboxMap =
- new ConcurrentHashMap<>();
- private final ConcurrentHashMap<String, SendingMailbox<TransferableBlock>>
_sendingMailboxMap =
- new ConcurrentHashMap<>();
+ private final Cache<String, ReceivingMailbox<TransferableBlock>>
_receivingMailboxCache =
+
CacheBuilder.newBuilder().expireAfterAccess(MAILBOX_CACHE_EXPIRY.toMinutes(),
TimeUnit.MINUTES).build();
Review Comment:
@61yao how does it "not work"? The periodic cache maintenance tasks are run
on writes or occasionally during reads. Only if the cache is not accessed for a
few hours would the entry not be cleaned in time. Instead of a Guava cache we
could consider using a different strategy but since this is only temporary I
weighed on the side of introducing as little temporary code as possible.
> Also the cleanup thread needs to be tied with query deadline.
I have set the expiry to 5 minutes which should be larger than any query
deadline.
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