Commits on May 27, 2022

1. cluster: drop redundant set_status config updates …

   If a follower isn't seeing controller log updates
   promptly, it may issue many set_status RPCs while
   it's waiting.  The controller leader should not
   turn all of these into log writes: if the status
   of the node already matches what it is reporting,
   then do not write anything.
   
   Fixes redpanda-data#4923
   
   (cherry picked from commit 0a2b991)

   

   jcsp authored and vbotbuildovich committed May 27, 2022
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2. cluster: wait between config set_status RPCs …

   On a healthy system, we do want to send set_status
   RPCs as soon as we're ready.  However, if the controller
   log updates are not being seen promptly, this would lead
   to the follower spamming the controller leader with
   very many set_status RPCs in a tight loop.
   
   Nodes will still send their status immediately when
   a config change occurs: this change only effects the
   behaviour if _another_ config change occurs while
   it is reporting status from the first change: in this
   case the follower will wait 5 seconds before sending
   its next status RPC.
   
   Related redpanda-data#4923
   
   (cherry picked from commit 3b1e56e)

   

   jcsp authored and vbotbuildovich committed May 27, 2022
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