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Don't have every handler update regionserver metrics on each scan#nextRaw; instead, do a batch update just before Scan returns. Otherwise, all running handlers end up contending on metrics update. M hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java Update of regionserver metrics counters moved out to caller where can be done as a batch update instead of per-next. M hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServer.java Class doc to encourage batch updating metrics. Remove the single update as unused anymore. M hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java Count calls to nextRaw. Update regionserver count in finally block when scan is done rather than per nextRaw call. Move all metrics updates to finally. Signed-off-by: Reid Chan <reidchan@apache.org> Signed-off-by: Baiqiang Zhao <ZhaoBQ>
Apache HBase [1] is an open-source, distributed, versioned, column-oriented store modeled after Google' Bigtable: A Distributed Storage System for Structured Data by Chang et al.[2] Just as Bigtable leverages the distributed data storage provided by the Google File System, HBase provides Bigtable-like capabilities on top of Apache Hadoop [3]. To get started using HBase, the full documentation for this release can be found under the doc/ directory that accompanies this README. Using a browser, open the docs/index.html to view the project home page (or browse to [1]). The hbase 'book' at http://hbase.apache.org/book.html has a 'quick start' section and is where you should being your exploration of the hbase project. The latest HBase can be downloaded from an Apache Mirror [4]. The source code can be found at [5] The HBase issue tracker is at [6] Apache HBase is made available under the Apache License, version 2.0 [7] The HBase mailing lists and archives are listed here [8]. The HBase distribution includes cryptographic software. See the export control notice here [9]. 1. http://hbase.apache.org 2. http://research.google.com/archive/bigtable.html 3. http://hadoop.apache.org 4. http://www.apache.org/dyn/closer.cgi/hbase/ 5. https://hbase.apache.org/source-repository.html 6. https://hbase.apache.org/issue-tracking.html 7. http://hbase.apache.org/license.html 8. http://hbase.apache.org/mail-lists.html 9. https://hbase.apache.org/export_control.html