Cheng Hao created HBASE-6852:
--------------------------------
Summary: SchemaMetrics.updateOnCacheHit costs too much while full
scanning a table with all of its fields
Key: HBASE-6852
URL: https://issues.apache.org/jira/browse/HBASE-6852
Project: HBase
Issue Type: Improvement
Components: metrics
Affects Versions: 0.94.0
Reporter: Cheng Hao
Priority: Minor
The SchemaMetrics.updateOnCacheHit costs too much while I am doing the full
table scanning.
Here is the top 5 hotspots within regionserver while full scanning a table:
(Sorry for the less-well-format)
CPU: Intel Westmere microarchitecture, speed 2.262e+06 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask
of 0x00 (No unit mask) count 5000000
samples % image name symbol name
-------------------------------------------------------------------------------
98447 13.4324 14033.jo void
org.apache.hadoop.hbase.regionserver.metrics.SchemaMetrics.updateOnCacheHit(org.apache.hadoop.hbase.io.hfile.BlockType$BlockCategory,
boolean)
98447 100.000 14033.jo void
org.apache.hadoop.hbase.regionserver.metrics.SchemaMetrics.updateOnCacheHit(org.apache.hadoop.hbase.io.hfile.BlockType$BlockCategory,
boolean) [self]
-------------------------------------------------------------------------------
45814 6.2510 14033.jo int
org.apache.hadoop.hbase.KeyValue$KeyComparator.compareRows(byte[], int, int,
byte[], int, int)
45814 100.000 14033.jo int
org.apache.hadoop.hbase.KeyValue$KeyComparator.compareRows(byte[], int, int,
byte[], int, int) [self]
-------------------------------------------------------------------------------
43523 5.9384 14033.jo boolean
org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(org.apache.hadoop.hbase.KeyValue)
43523 100.000 14033.jo boolean
org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(org.apache.hadoop.hbase.KeyValue)
[self]
-------------------------------------------------------------------------------
42548 5.8054 14033.jo int
org.apache.hadoop.hbase.KeyValue$KeyComparator.compare(byte[], int, int,
byte[], int, int)
42548 100.000 14033.jo int
org.apache.hadoop.hbase.KeyValue$KeyComparator.compare(byte[], int, int,
byte[], int, int) [self]
-------------------------------------------------------------------------------
40572 5.5358 14033.jo int
org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.binarySearchNonRootIndex(byte[],
int, int, java.nio.ByteBuffer, org.apache.hadoop.io.RawComparator)~1
40572 100.000 14033.jo int
org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.binarySearchNonRootIndex(byte[],
int, int, java.nio.ByteBuffer, org.apache.hadoop.io.RawComparator)~1 [self]
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