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From "Murukesh Mohanan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13000) slow query log analysis tool
Date Tue, 28 Feb 2017 12:45:45 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Murukesh Mohanan updated CASSANDRA-13000:
-----------------------------------------
         Assignee: Murukesh Mohanan
    Fix Version/s: 4.0
           Status: Patch Available  (was: Open)

I have wrapped the previously uploaded script in a patch, placing it in {{tools/bin}} and
creating the bat/shell wrappers for it. I also added a {{-g/--grep}} option for filtering
queries with regex.

> slow query log analysis tool
> ----------------------------
>
>                 Key: CASSANDRA-13000
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13000
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Observability
>            Reporter: Jon Haddad
>            Assignee: Murukesh Mohanan
>             Fix For: 4.0
>
>         Attachments: 0001-Adds-a-cqldumpslow-tool-which-analyses-the-debug-log.patch,
csqldumpslow.py
>
>
> As a follow up to CASSANDRA-12403, it would be very helpful to have a tool to process
the slow queries that are logged.  In the MySQL world, there's a tool called mysqldumpslow,
which processes a slow query log, abstracts the parameters to prepared statements, and shows
the queries which are causing problems based on frequency.  The {{mysqldumpslow}} utillity
shows an aggregated count & time statistics spent on slow queries.  For instance:
> {code}shell> mysqldumpslow
> Reading mysql slow query log from /usr/local/mysql/data/mysqld51-apple-slow.log
> Count: 1  Time=4.32s (4s)  Lock=0.00s (0s)  Rows=0.0 (0), root[root]@localhost
>  insert into t2 select * from t1
> Count: 3  Time=2.53s (7s)  Lock=0.00s (0s)  Rows=0.0 (0), root[root]@localhost
>  insert into t2 select * from t1 limit N
> Count: 3  Time=2.13s (6s)  Lock=0.00s (0s)  Rows=0.0 (0), root[root]@localhost
>  insert into t1 select * from t1{code}



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