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https://issues.apache.org/jira/browse/HBASE-24205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan updated HBASE-24205:
-------------------------------------------
Release Note:
Adds a new metric where we collect the number of read requests (tracked per
row) whether the row was fetched completely from memstore or it was pulled from
files and memstore.
The metric is now collected under the mbean for Tables and under the mbean for
regions.
Under table mbean ie.-
'name": "Hadoop:service=HBase,name=RegionServer,sub=Tables'
The new metrics will be listed as
{code}
"Namespace_default_table_t3_columnfamily_f1_metric_memstoreOnlyRowReadsCount":
5,
"Namespace_default_table_t3_columnfamily_f1_metric_mixedRowReadsCount": 1,
{code}
Where the format is
Namespace_<namespacename>_table_<tableName>_columnfamily_<columnfamilyname>_metric_memstoreOnlyRowReadsCount
Namespace_<namespacename>_table_<tableName>_columnfamily_<columnfamilyname>_metric_mixedRowReadsCount
{code}
The same one under the region comes as
{code}
"Namespace_default_table_t3_region_75a7846f4ac4a2805071a855f7d0dbdc_store_f1_metric_memstoreOnlyRowReadsCount":
5,
"Namespace_default_table_t3_region_75a7846f4ac4a2805071a855f7d0dbdc_store_f1_metric_mixedRowReadsCount":
1,
{code}
where
Namespace_<namespacename_table_<tableName>_region_<regionName>_store_<storeName>_metric_memstoreOnlyRowReadsCount
Namespace_<namespacename_table_<tableName>_region_<regionName>_store_<storeName>_metric_mixedRowReadsCount
This is also an aggregate against every store the number of reads that happened
purely from the memstore or it was a mixed read that happened from memstore
and file.
> Create metric to know the number of reads that happens from memstore
> --------------------------------------------------------------------
>
> Key: HBASE-24205
> URL: https://issues.apache.org/jira/browse/HBASE-24205
> Project: HBase
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 3.0.0-alpha-1
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.3.0, 2.2.6
>
> Attachments: screenshot.png, screenshot_tablevscf.png
>
>
> A metric to identify number of reads that were served from memstore (atleast
> if the gets can be accounted for) then it gives a value addition to know if
> among the reads how much was targeted at the most recent data.
> Currently the existing metric framework at region level should be enough but
> we can also add a metric per store level. That will be more granular.
> We can also expose this via HbTop.
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