lfrancke commented on issue #3425: NIFI-6197 HBase: Fix deprecations, default for client retries & validations URL: https://github.com/apache/nifi/pull/3425#issuecomment-482339547 I can only provide anecdotes as well but I've now had two customers faces this issue in a short time which lead me to look into it. And we had good reasons to set this number to the current value in HBase :) In HBase 1.x the MTTR wasn't as good as it is now in 2.x so the retry count can be lowered in newer versions. Another good reason to not hardcode the default in NiFi, the defaults change the more we learn and work on the stability and MTTR. I don't fully understand the Javadoc on `AbstractConfigurableComponent#customValidate` but if it's only called after all properties have been set and the user clicked on Apply/Save then we could establish a connection (and tear it down again) there to validate whether the details are correct. Another option is to make a connection with retry = 1 in onEnabled and if that works tear it down and reconnect with the proper number. This will mean that enabling will take longer than before even if everything's good. If any of those is acceptable to you I'll work it into the patch.
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