Redis high memory in redis stream

I use redis version:6.2.6, the stream key is high,I use xadd to limit the length of stream,but the memory kept high,after running whole day, redis memory kept high.The next day when I del the stream key,the memory immediately down. How can I debug the problem?

Comment From: oranagra

some data from XINFO would have probably been useful.

Comment From: allenzhuyi

xinfo groups streamid

1) "name" 2) "dev" 3) "consumers" 4) (integer) 1 5) "pending" 6) (integer) 206894 7) "last-delivered-id" 8) "1653569485209-0" there are so many pending result. This may be the reason why the memory kept running even the xlen of the stream kept same.

Comment From: guybe7

@allenzhuyi can you please provide more info? XLEN and XINFO STREAM

Comment From: allenzhuyi

xinfo groups key

I seee many delayed message, When I delete the key,the memory is down