Random reads in mapfile are 3times slower in TRUNK than they are in 0.15.x
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Key: HADOOP-2488
URL: https://issues.apache.org/jira/browse/HADOOP-2488
Project: Hadoop
Issue Type: Bug
Reporter: stack
Opening a mapfile on hdfs and then doing 100k random reads inside the open file
takes 3 times longer to complete in TRUNK than same test run on 0.15.x.
Random read performance is important to hbase.
Serial reads and writes perform about the same in TRUNK and 0.15.x.
Below are 3 runs done against 0.15 of the mapfile test that can be found in
hbase followed by 2 runs done against TRUNK:
0.15 branch
{code}
[EMAIL PROTECTED] hbase]$ for i in 1 2 3; do ./bin/hbase
org.apache.hadoop.hbase.PerformanceEvaluation mapfile 1; done
07/12/24 18:34:50 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
07/12/24 18:34:50 INFO hbase.PerformanceEvaluation: Writing 100000 rows to
hdfs://XXXX:9123/user/?/performanceevaluation.mapfile
07/12/24 18:35:13 INFO hbase.PerformanceEvaluation: Writing 100000 records took
23644ms (Note: generation of keys and values is done inline and has been seen
to consume significant time: e.g. ~30% of cpu time
07/12/24 18:35:13 INFO hbase.PerformanceEvaluation: Reading 100000 random rows
....
07/12/24 18:37:23 INFO hbase.PerformanceEvaluation: Reading 100000 random
records took 129879ms (Note: generation of random key is done in line and takes
a significant amount of cpu time: e.g 10-15%
07/12/24 18:37:23 INFO hbase.PerformanceEvaluation: Reading 100000 rows
sequentially
07/12/24 18:37:25 INFO hbase.PerformanceEvaluation: Reading 100000 records
serially took 1832ms
07/12/24 18:37:26 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
07/12/24 18:37:26 INFO hbase.PerformanceEvaluation: Writing 100000 rows to
hdfs://XXXXX:9123/user/?/performanceevaluation.mapfile
07/12/24 18:37:50 INFO hbase.PerformanceEvaluation: Writing 100000 records took
24188ms (Note: generation of keys and values is done inline and has been seen
to consume significant time: e.g. ~30% of cpu time
07/12/24 18:37:50 INFO hbase.PerformanceEvaluation: Reading 100000 random rows
...
07/12/24 18:39:58 INFO hbase.PerformanceEvaluation: Reading 100000 random
records took 127879ms (Note: generation of random key is done in line and takes
a significant amount of cpu time: e.g 10-15%
07/12/24 18:39:58 INFO hbase.PerformanceEvaluation: Reading 100000 rows
sequentially
07/12/24 18:40:00 INFO hbase.PerformanceEvaluation: Reading 100000 records
serially took 1787ms
07/12/24 18:40:01 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
07/12/24 18:40:01 INFO hbase.PerformanceEvaluation: Writing 100000 rows to
hdfs://XXXX:9123/user/?/performanceevaluation.mapfile
07/12/24 18:40:24 INFO hbase.PerformanceEvaluation: Writing 100000 records took
23832ms (Note: generation of keys and values is done inline and has been seen
to consume significant time: e.g. ~30% of cpu time
07/12/24 18:40:24 INFO hbase.PerformanceEvaluation: Reading 100000 random rows
..
07/12/24 18:42:31 INFO hbase.PerformanceEvaluation: Reading 100000 random
records took 126954ms (Note: generation of random key is done in line and takes
a significant amount of cpu time: e.g 10-15%
07/12/24 18:42:31 INFO hbase.PerformanceEvaluation: Reading 100000 rows
sequentially
07/12/24 18:42:33 INFO hbase.PerformanceEvaluation: Reading 100000 records
serially took 1766ms
07/12/24 17:24:25 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
07/12/24 17:24:25 INFO hbase.PerformanceEvaluation: Writing 100000 rows to
hdfs://XXXXX:9123/user/?/performanceevaluation.mapfile
07/12/24 17:24:49 INFO hbase.PerformanceEvaluation: Writing 100000 records took
24181ms (Note: generation of keys and values is done inline and has been seen
to consume significant time: e.g. ~30% of cpu time
07/12/24 17:24:49 INFO hbase.PerformanceEvaluation: Reading 100000 random rows
...
07/12/24 17:26:59 INFO hbase.PerformanceEvaluation: Reading 100000 random
records took 129564ms (Note: generation of random key is done in line and takes
a significant amount of cpu time: e.g 10-15%
07/12/24 17:26:59 INFO hbase.PerformanceEvaluation: Reading 100000 rows
sequentially
07/12/24 17:27:00 INFO hbase.PerformanceEvaluation: Reading 100000 records
serially took 1793ms
{code}
TRUNK
{code]
[EMAIL PROTECTED] hbase]$ ./bin/hbase
org.apache.hadoop.hbase.PerformanceEvaluation mapfile 1
07/12/24 18:02:26 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
07/12/24 18:02:26 INFO hbase.PerformanceEvaluation: Writing 100000 rows to
hdfs://XXXX3/user/?/performanceevaluation.mapfile
07/12/24 18:02:51 INFO hbase.PerformanceEvaluation: Writing 100000 records took
25500ms (Note: generation of keys and values is done inline and has been seen
to consume significant time: e.g. ~30% of cpu time
07/12/24 18:02:51 INFO hbase.PerformanceEvaluation: Reading 100000 random rows
....
07/12/24 18:11:11 INFO hbase.PerformanceEvaluation: Reading 100000 random
records took 500306ms (Note: generation of random key is done in line and takes
a significant amount of cpu time: e.g 10-15%
07/12/24 18:11:11 INFO hbase.PerformanceEvaluation: Reading 100000 rows
sequentially
07/12/24 18:11:13 INFO hbase.PerformanceEvaluation: Reading 100000 records
serially took 1940ms
[EMAIL PROTECTED] hbase]$ ./bin/hbase
org.apache.hadoop.hbase.PerformanceEvaluation mapfile 1
07/12/24 18:12:46 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
07/12/24 18:12:46 INFO hbase.PerformanceEvaluation: Writing 100000 rows to
hdfs://XXXX/user/?/performanceevaluation.mapfile
07/12/24 18:13:12 INFO hbase.PerformanceEvaluation: Writing 100000 records took
25593ms (Note: generation of keys and values is done inline and has been seen
to consume significant time: e.g. ~30% of cpu time
07/12/24 18:13:12 INFO hbase.PerformanceEvaluation: Reading 100000 random rows
...
07/12/24 18:22:16 INFO hbase.PerformanceEvaluation: Reading 100000 random
records took 543992ms (Note: generation of random key is done in line and takes
a significant amount of cpu time: e.g 10-15%
07/12/24 18:22:16 INFO hbase.PerformanceEvaluation: Reading 100000 rows
sequentially
07/12/24 18:22:18 INFO hbase.PerformanceEvaluation: Reading 100000 records
serially took 1786ms
{code}
Above was done on a small hdfs cluster of 4 machines with each a dfs node.
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