[jira] [Commented] (HBASE-11683) Metrics for MOB

["Jingcheng Du (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-11683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087492#comment-14087492 ] 

Jingcheng Du commented on HBASE-11683:
--------------------------------------

Currently we have defined the metrics on the mob flusher.
1. how many times of flushing occurs.
2. how many cells are flushed to the mob file.
3. how many size of mob cells are flushed to the mob file.

about #5 The compaction/sweeps is a tool out of hbase and uses the mapreduce. We use the context counter to do the metrics work.
I'm thinking how to implement the #2 mob reads, is it okay to record how many times the scanner read from the mob files? I don't see HBase has metrics in the normal scanner, is it necessary for the mob read? Please advise. Thanks.

> Metrics for MOB
> ---------------
>
>                 Key: HBASE-11683
>                 URL: https://issues.apache.org/jira/browse/HBASE-11683
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>    Affects Versions: 2.0.0
>            Reporter: Jonathan Hsieh
>            Assignee: Jingcheng Du
>
> We need to make sure to capture metrics about mobs.
> Some basic ones include:
> # of mob writes
> # of mob reads
> # avg size of mob (?)
> # mob files
> # of mob compactions / sweeps



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