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https://issues.apache.org/jira/browse/CASSANDRA-18732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Caleb Rackliffe updated CASSANDRA-18732:
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Reviewers: David Capwell
> Baseline Diagnostic vtables for Accord
> --------------------------------------
>
> Key: CASSANDRA-18732
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18732
> Project: Cassandra
> Issue Type: Improvement
> Components: Accord, Observability/Metrics
> Reporter: Caleb Rackliffe
> Assignee: Caleb Rackliffe
> Priority: Normal
> Labels: pull-request-available
> Fix For: 5.x
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> In addition to JMX-based metrics, there are bits of diagnostic information
> for Accord that we should consider exposing through vtables:
> 1.) We should ensure that coordinator-level CQL transactions and the local
> reads and writes they spawn are visible to the existing {{QueriesTable}}
> vtable.
> The first may already just work. We may need to make some tweaks to
> {{TxnNamedRead}} and {{TxnWrite}} for the local operations though.
> ({{CommandStore}} tasks are out of scope here, as they would probably be more
> confusing than useful in {{QueriesTable}}?)
> 2.) A new vtable for pending commands for a key.
> - Disable SELECT */require a partition key
> - Might require partial back-port of stringifying table/partition key from
> Accord to be correct
> - ex. {{SELECT timestamps FROM myawesometable where ks=? and table=? and
> partition_key=?}}
> - Clustering can be the Accord timestamp elements, no further normal columns.
> 3.) A new vtable for command store-specific cache stats
> - Gather via {{Store.execute()}} for correctness.
> - Store id should be partition key (see {{AccordCommandStore}})
> - hits, misses, total (maybe just throw out the keyspaces and coalesce
> ranges?)
> 4.) (Requires [~aweisberg]'s outstanding work) A new vtable for live
> migration state
> - {{TableMigrationState}} could be flattened into a row
> - Is this already persisted? If so, why a new vtable?
> 5.) A vtable to expose {{accord.local.Node#coordinating()}} as a map
> - ex. {{SELECT txn_id, type}}
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