lettuce-core: lettuce cluster multiGet RedisCommandTimeoutException cause memory leak

I used lettuce 5.0.5.RELEASE and Spring Boot 2.0

and I write the code to multiGet value

  @Autowired
   private RedisTemplate<String, byte[]> redisTemplate;

        redisTemplate.opsForValue().multiGet(
            ids.stream()
                .map(RedisVideoProfileCache::genCacheKey)
                .collect(Collectors.toSet())
        )

Whenever I start the service for a long time, some app’s memory is leaked I download a jmap to debug it

 num     #instances         #bytes  class name
----------------------------------------------
   1:       5668369     3397294608  [B
   2:       9985354      455769512  [Ljava.lang.Object;
   3:       9797176      313509632  java.util.HashMap$Node
   4:       9700404      232809696  java.util.concurrent.CompletableFuture
   5:       8891675      213400200  java.util.ArrayList
   6:       3189943      127597720  io.lettuce.core.output.KeyValueListOutput
   7:       2802968      112118720  java.util.concurrent.CompletableFuture$BiRelay
   8:       3190015      102080480  io.lettuce.core.protocol.AsyncCommand
   9:       3190015      102080480  io.lettuce.core.protocol.Command
  10:       2358668       94346720  java.util.concurrent.CompletableFuture$UniWhenComplete
  11:       1077001       92868160  [C
  12:       3218728       77249472  io.lettuce.core.protocol.CommandArgs$KeyArgument
  13:       2399019       76768608  java.util.ArrayList$Itr
  14:       3190015       76560360  io.lettuce.core.protocol.CommandArgs
  15:        107450       76403064  [Ljava.util.HashMap$Node;
  16:       1572519       62900760  java.util.concurrent.CompletableFuture$UniApply
  17:       2411845       57884280  io.lettuce.core.KeyValue
  18:       3224435       51590960  java.lang.Integer
  19:        801185       32047400  io.lettuce.core.cluster.ClusterCommand
  20:        786213       31448520  java.util.concurrent.CompletableFuture$UniHandle
  21:       1251582       30037968  java.util.concurrent.CompletableFuture$CoCompletion
  22:        225886       29931880  [I
  23:        457000       25592000  org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation
  24:        786283       25161056  io.lettuce.core.DefaultConnectionFuture
  25:        826014       23765088  [Ljava.util.concurrent.CompletableFuture;
  26:        853506       20484144  java.lang.String
  27:        786652       18879648  io.lettuce.core.cluster.PooledClusterConnectionProvider$$Lambda$1028/1326396018
  28:        786652       18879648  io.lettuce.core.cluster.PooledClusterConnectionProvider$$Lambda$1030/1117636922
  29:        786652       18879648  io.lettuce.core.cluster.PooledClusterConnectionProvider$$Lambda$1031/481259366

the byte[] used large than normal case

When I checked this app error log, I found large count RedisCommandTimeoutException

 less c67003c59bbb854f176124c48d4c172a0d7aff1b1d14725705a7d3e57aad9e4a.log  | grep ERROR | grep  "io.lettuce.core.RedisCommandTimeoutException: Command timed out" | wc
  12804  320100 3111372

less c67003c59bbb854f176124c48d4c172a0d7aff1b1d14725705a7d3e57aad9e4a.log  | grep ERROR | grep -v "io.lettuce.core.RedisCommandTimeoutException: Command timed out" | wc
     20     467    4835

I suspect this exception caused a memory leak, why ?

---

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