harinirajendran opened a new issue, #12448:
URL: https://github.com/apache/druid/issues/12448
### Affected Version
0.21, 0.22.1 [We noticed it only when we were on 0.21]. This could have been
happening earlier too.
### Description
95% of our real-time ingestion task logs are filled with the following
messages
```
{"@timestamp":"2022-03-28T18:30:14.181Z", "log.level": "WARN",
"message":"Not closed! Object leaked from StupidPool{name=littleEndByteBufPool,
objectsCacheMaxCount=2147483647, poolSize=6}. Allowing gc to prevent leak.",
"service.name":"druid/middleManager","event.dataset":"druid/middleManager.log","process.thread.name":"Cleaner-0","log.logger":"org.apache.druid.collections.StupidPool"}
{"@timestamp":"2022-03-28T18:30:14.181Z", "log.level": "WARN",
"message":"Not closed! Object leaked from StupidPool{name=littleEndByteBufPool,
objectsCacheMaxCount=2147483647, poolSize=5}. Allowing gc to prevent leak.",
"service.name":"druid/middleManager","event.dataset":"druid/middleManager.log","process.thread.name":"Cleaner-0","log.logger":"org.apache.druid.collections.StupidPool"}
{"@timestamp":"2022-03-28T18:30:14.181Z", "log.level": "WARN",
"message":"Not closed! Object leaked from StupidPool{name=littleEndByteBufPool,
objectsCacheMaxCount=2147483647, poolSize=5}. Allowing gc to prevent leak.",
"service.name":"druid/middleManager","event.dataset":"druid/middleManager.log","process.thread.name":"Cleaner-0","log.logger":"org.apache.druid.collections.StupidPool"}
```
The ingestion tasks are working fine, but the logs are flooded with these
WARN messages.
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