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HBASE-28985 Fix memStoreSize metric for a table and add heap and off-heap size metrics #6486
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…heap size metrics
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The "memStoreSize" metric for a table is incorrect as it reports the sum of the data size, the heap size, and the off-heap size, while "memStoreSize" metric for a region or a region server is just the data size.
hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsTableWrapperAggregateImpl.java
Lines 79 to 80 in e082405
We should fix it to report only the data size for consistency and add additional metrics, similarly to HBASE-27892, not to lose the extra information for understanding the flush behavior.