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https://issues.apache.org/jira/browse/HBASE-29970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Liu updated HBASE-29970:
-----------------------------
Description:
This change removes the unused \{{incrSplitSuccess()}}, \{{updateSplitTime()}},
and related split success/time metrics from RegionServer and Table level
metrics sources.
These metrics \{{splitSuccess}} and \{{splitTime}} is introduced by
HBASE-12779, the split operation has been migrated from RegionServer-driven
local execution to Master-driven Procedure-based coordination. When a
RegionServer triggers a split due to region size threshold, it only sends a
\{{READY_TO_SPLIT}} state transition request to the Master via
\{{reportRegionStateTransition()}}. The Master then creates a
\{{SplitTableRegionProcedure}} to asynchronously coordinate the entire split
process. The RegionServer has no knowledge of when (or whether) the split
completes successfully, so it cannot update split success or timing metrics, in
HBASE-16549 we refactor split metric logic and start to use
\{{splitProcMetrics}} tracking the split behaivor
h3. Current Behavior
* Split request metrics (\{{splitRequestCount}}) are properly updated when a
split is initiated
* Split success/time metrics at RegionServer and Table level were defined but
never called
* Master-side split metrics (\{{splitSubmittedCount}}, \{{splitTime}},
\{{splitFailedCount}}) are correctly maintained via the Procedure framework's
\{{getProcedureMetrics()}} mechanism
h3. Changes Made
* Removed \{{incrSplitSuccess()}} and \{{updateSplitTime()}} methods from
\{{MetricsRegionServerSource}} and \{{MetricsRegionServerSourceImpl}},
corresponding methods from \{{MetricsTableSource}} and
\{{MetricsTableSourceImpl}}, and related metric definitions and histogram
variables
* We keep \{{SplitRequest}} and support table-level updates for this metic to
track split caused by region size exceeds the configured max size
*
\{code:language=|borderStyle=solid|theme=RDark|linenumbers=true|collapse=false}
* CompactSplit.requestSplit()
* → new SplitRequest(r, midKey, server, user)
* → splits.execute(splitRequest)
* → SplitRequest.run()
* → doSplitting()
* → server.getMetrics().incrSplitRequest(tableName)
* \{code}
> SplitSuccess and SplitTime metrics are no longer used at RegionServer and
> Table level
> -------------------------------------------------------------------------------------
>
> Key: HBASE-29970
> URL: https://issues.apache.org/jira/browse/HBASE-29970
> Project: HBase
> Issue Type: Improvement
> Components: metrics
> Reporter: Xiao Liu
> Assignee: Xiao Liu
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.7.0, 3.0.0-beta-2, 2.6.5, 2.5.14
>
>
> This change removes the unused \{{incrSplitSuccess()}},
> \{{updateSplitTime()}}, and related split success/time metrics from
> RegionServer and Table level metrics sources.
> These metrics \{{splitSuccess}} and \{{splitTime}} is introduced by
> HBASE-12779, the split operation has been migrated from RegionServer-driven
> local execution to Master-driven Procedure-based coordination. When a
> RegionServer triggers a split due to region size threshold, it only sends a
> \{{READY_TO_SPLIT}} state transition request to the Master via
> \{{reportRegionStateTransition()}}. The Master then creates a
> \{{SplitTableRegionProcedure}} to asynchronously coordinate the entire split
> process. The RegionServer has no knowledge of when (or whether) the split
> completes successfully, so it cannot update split success or timing metrics,
> in HBASE-16549 we refactor split metric logic and start to use
> \{{splitProcMetrics}} tracking the split behaivor
> h3. Current Behavior
> * Split request metrics (\{{splitRequestCount}}) are properly updated when a
> split is initiated
> * Split success/time metrics at RegionServer and Table level were defined but
> never called
> * Master-side split metrics (\{{splitSubmittedCount}}, \{{splitTime}},
> \{{splitFailedCount}}) are correctly maintained via the Procedure framework's
> \{{getProcedureMetrics()}} mechanism
> h3. Changes Made
> * Removed \{{incrSplitSuccess()}} and \{{updateSplitTime()}} methods from
> \{{MetricsRegionServerSource}} and \{{MetricsRegionServerSourceImpl}},
> corresponding methods from \{{MetricsTableSource}} and
> \{{MetricsTableSourceImpl}}, and related metric definitions and histogram
> variables
> * We keep \{{SplitRequest}} and support table-level updates for this metic to
> track split caused by region size exceeds the configured max size
> *
> \{code:language=|borderStyle=solid|theme=RDark|linenumbers=true|collapse=false}
> * CompactSplit.requestSplit()
> * → new SplitRequest(r, midKey, server, user)
> * → splits.execute(splitRequest)
> * → SplitRequest.run()
> * → doSplitting()
> * → server.getMetrics().incrSplitRequest(tableName)
> * \{code}
>
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