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From "Ankit Singhal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4701) Write client-side metrics asynchronously to SYSTEM.LOG
Date Fri, 11 May 2018 21:46:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16472710#comment-16472710
] 

Ankit Singhal commented on PHOENIX-4701:
----------------------------------------

{quote}I suspect it's for the write metrics. That'd be good to add in a follow on JIRA.
{quote}
Yes, currently we don't store write metrics or any metric only collected at a connection
level.
{quote}Do you think we have enough testing to commit this?
{quote}
I can test it over the weekend and commit if you are not planning the RC today.

bq. probably better to use EnvironmentEdgeManager.currentTimeMillis() instead of System.currentTimeMillis()
here and elsewhere. Will make testing easier.
Sure, I'll make that change.

 

> Write client-side metrics asynchronously to SYSTEM.LOG
> ------------------------------------------------------
>
>                 Key: PHOENIX-4701
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4701
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: James Taylor
>            Priority: Major
>             Fix For: 4.15.0
>
>         Attachments: PHOENIX-4701.patch, PHOENIX-4701_master.patch, PHOENIX-4701_wip1.patch,
PHOENIX-4701_wip2.patch, PHOENIX-4701_wip3.patch
>
>
> Rather than inventing a new, different set of client-side metrics to persist, we should
just persist our [client metrics|http://phoenix.apache.org/metrics.html] in the SYSTEM.LOG.
The metrics captures all the same information as your QueryLogInfo (and much more), rolls
all the information up to a single set of metrics for each Phoenix statement (aggregating/merging
parallel scans, etc), and can emits a single log line (which could be written in a single
upsert statement). At SFDC, we emit this information into a file system log in a layer above
(and use Splunk to produce nifty dashboard for monitoring), but this could easily be emitted
directly in Phoenix and go through your asynchronous write path (and then use Phoenix queries
to produce the same kind of dashboards). The only piece would be to add the concept of a log
level to each metric to enable statically controlling which metrics are output.
> With this approach, the SYSTEM.LOG table could be declared immutable and use our dense
storage format with a single byte for column encoding and get a 3-5x perf gain. This would
also open the door for users to potentially add secondary indexes on the table. See schema
identified in the wip2 patch.



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