[GitHub] nickva opened a new pull request #934: Configurable delay before retrying on missing_doc error in replicator

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nickva opened a new pull request #934: Configurable delay before retrying on missing_doc error in replicator
URL: https://github.com/apache/couchdb/pull/934
 
 
   Implement a configurable delay before retrying a document fetch in replicator.
   
   missing_doc exceptions usually happen when there is a continuous replication
   set up and the source is updated. The change might appear in the changes feed,
   but when worker tries to fetch the document's revisions it talks to a
   node where internal replication hasn't caught up and so it throws an exception.
   
   Previously the delay was hard-coded at 0 (that is retrying was immediate). The
   replication would still make progress, but after crashing, retrying and
   generating a lot of unnecessary log noise. Since updating a source while
   continuous replication is running is a common scenario, it's worth optimizing
   for it and avoiding wasting resources and spamming logs.
   
   

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