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Chris Lu
c925869dcc
* shell: retry filer discovery until a filer registers When -filer is not given, the shell discovers a filer with a single ListClusterNodes call right after connecting to the master. A filer can take several seconds to register after its port reports ready, so the list routinely comes back empty and the shell proceeds with an empty FilerAddress. Commands then fail with "dial tcp: missing address", which is how the s3tables Dremio integration test flaked in CI. Treat an empty list as retryable and keep polling ListClusterNodes until a filer appears or -connectTimeout expires. On timeout, print a clear "no filer registered" notice instead of failing later inside a command; master-only shell commands keep working either way. * shell: report the last filer discovery attempt failure A successful empty ListClusterNodes followed by a master outage left the diagnostic claiming no filer registered, hiding the real RPC failure. Track the outcome of the latest attempt instead: if the final list call failed, report that error; only when the last response was genuinely empty report that no filer registered within the timeout. * shell: test filer discovery retries against a fake master Extract the discovery loop into listFilers and cover the retry behavior with a fake master_pb.SeaweedServer: an empty cluster turning populated, an empty cluster exhausting the window without error, the last attempt's RPC failure being reported, and master-only commands still running after the discovery timeout.