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As dashengju stated from STORM-738, very busy ShellBolt subprocess cannot respond heartbeat just in time.
Actually it's by design constraint (more details are on STORM-513 or STORM-738), but ShellSpout avoids constraint by updating heartbeat at any type of response from subprocess.
We can apply this approach to ShellBolt and let ShellBolt avoid design constraint, too.
Very busy ShellBolt subprocess with Non-ACK mode cannot respond heartbeat just in time
Multilang needs Overflow-Control mechanism and HeartBeat timeout problem
Change multilang heartbeat mechanism to multi-threading of subprocess
Frozen topology (KafkaSpout + Multilang bolt)