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https://issues.apache.org/jira/browse/KUDU-1934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15922750#comment-15922750
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Adar Dembo commented on KUDU-1934:
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The way it works today: a tserver will retry a failed heartbeat request in a
tight loop up to heartbeat_max_failures_before_backoff times (defaults to 3).
If all those attempts fail, it'll back off and retry every
heartbeat_interval_ms (defaults to 1000).
Are you saying that this bimodal backoff (tight for a fixed number of attempts,
then periodic forever) should be replaced with something smoother, like a
linear or exponential backoff? If so, why?
I'm asking because there's an argument to be made for a tserver to reestablish
connectivity with the masters fairly quickly, so that any work destined for
that tserver (such as deleting redundant replicas, or adding new replicas) can
be handled promptly.
> tservers aggressively try to reconnect to masters
> -------------------------------------------------
>
> Key: KUDU-1934
> URL: https://issues.apache.org/jira/browse/KUDU-1934
> Project: Kudu
> Issue Type: Bug
> Components: tserver
> Affects Versions: 1.3.0
> Reporter: Jean-Daniel Cryans
> Labels: newbie
>
> Related to KUDU-1933, I had mismatched 1.3 snapshots between the master and
> the tservers which caused them to try to reconnect to the master infinitely.
> Since they do it as fast as they can, the logs were quickly full of:
> {noformat}
> I0307 23:55:21.228502 70832 heartbeater.cc:291] Connected to a master server
> at ve0120.halxg.cloudera.com:7051
> I0307 23:55:21.228528 70832 heartbeater.cc:359] Registering TS with master...
> I0307 23:55:21.228865 70832 heartbeater.cc:389] Master
> ve0120.halxg.cloudera.com:7051 requested a full tablet report, sending...
> W0307 23:55:21.346961 70832 heartbeater.cc:499] Failed to heartbeat to
> ve0120.halxg.cloudera.com:7051: Remote error: Failed to send heartbeat to
> master: Not authorized: invalid CSR: CSR did not contain expected username.
> (CSR: '' RPC: 'kudu')
> I0307 23:55:22.347733 70832 heartbeater.cc:291] Connected to a master server
> at ve0120.halxg.cloudera.com:7051
> I0307 23:55:22.347757 70832 heartbeater.cc:359] Registering TS with master...
> I0307 23:55:22.348042 70832 heartbeater.cc:389] Master
> ve0120.halxg.cloudera.com:7051 requested a full tablet report, sending...
> W0307 23:55:22.467021 70832 heartbeater.cc:499] Failed to heartbeat to
> ve0120.halxg.cloudera.com:7051: Remote error: Failed to send heartbeat to
> master: Not authorized: invalid CSR: CSR did not contain expected username.
> (CSR: '' RPC: 'kudu')
> {noformat}
> Sounds like we should do backoff retries.
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