Does the thread would reuse when one thread occur the IO block?

[kevinWangSheng]

background: when I consume the message ,I use a TTL threadlocal to store a thread variable, and when the consumer consume the message , it will do some DB operator and use spring feign to request another interface. And begin the consume, I remove the TTL ThreadLocal value, and reset a new value in it.

problem: I through the log find that: a message be consume and call the DB operator, the value of TTL threadlocal was be changed.

Does have any one to help me to find the answer?