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https://issues.apache.org/jira/browse/HADOOP-9421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13690496#comment-13690496
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Luke Lu commented on HADOOP-9421:
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bq. Ok, so now how would you handle improved serverId based tokens? Always take
the REINITIATE hit?
Maintain a persistent (serverId -> mech) cache in /tmp/hadoop-$user/rpc. Again:
it should be choice of protocol users (system designers).
bq. In this case, can't the client just blast the INITIATE before getting a
NEGOTIATE?
Like I said before, ignoring NEGOTIATE in client increase client complexity to
ignore the right NEGOTIATE. What if server upgrade/security fix happened in
between?
bq. do you believe there will actually be a measurable performance difference?
Depending on the use case, e.g. a console managing multiple hadoop clusters in
multiple regions: the additional round trip could be in hundreds of ms! which
is extremely annoying.
bq. Will having the client ignore the inflight NEGOTIATE on a reconnect have a
measurable latency
Like I said, client will have to decide when to ignore the NEGOTIATE, which
increase client complexity while still feel dirty. I've shown that this
ugliness is not necessary.
bq. If so, is the extra round trip for REINITIATEs a bad thing
REINITIATE is only supposed to happen when mech cache goes stale.
bq. I'll just add it. I'll re-leverage the existing states to avoid adding the
reinitate.
IMO, explicit REINITIATE make things a lot easier to reason about.
bq. prevent a client seizing a connection thread.
What're you talking about? The new protocol allows completely non-blocking
client.
> Convert SASL to use ProtoBuf and add lengths for non-blocking processing
> ------------------------------------------------------------------------
>
> Key: HADOOP-9421
> URL: https://issues.apache.org/jira/browse/HADOOP-9421
> Project: Hadoop Common
> Issue Type: Sub-task
> Affects Versions: 2.0.3-alpha
> Reporter: Sanjay Radia
> Assignee: Daryn Sharp
> Priority: Blocker
> Attachments: HADOOP-9421.patch, HADOOP-9421.patch, HADOOP-9421.patch,
> HADOOP-9421.patch, HADOOP-9421.patch, HADOOP-9421.patch, HADOOP-9421.patch,
> HADOOP-9421.patch, HADOOP-9421-v2-demo.patch
>
>
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