Improvements#137
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* Test explicit failure in `parse_result`. We identified that this function can fail with various I/O errors. In the case of a failure, the retry mechanism is not invoked. This can cause unexpected failures in the client if servers in the cluster fail when reading the result of a command.
- Handle almost all exceptions and retry. - Add backoff during retry to avoid congestion. - Increase default `max_retries` to 3.
Aerospike has some tricky exception handling where some kinds of result codes represent fatal errors which no amount of retrying will help. We need to differentiate these so that the retry mechanism immediately fails in those cases.
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We have a list of improvements, that have been implemented in our fork for the ruby client since we started using Aerospike. We've been running them in production for several years already.
If they look reasonable to you, please consider merging them to the main repo.