拿hbase基準(zhǔn)測(cè)試列子來(lái)分析哪些線程使用比較高的cpu，環(huán)境是linux，基準(zhǔn)測(cè)試命令：

hbase org.apache.hadoop.hbase.PerformanceEvaluation ?--rows=500000 --nomapred --presplit=5 --writeToWAL=true randomWrite 5

首先查看占用cpu最高的進(jìn)程和線程id，執(zhí)行命令：

[ocnosql@server01 logs]$ ps Hh -eo pid,tid,pcpu | sort -nk3 |tail

12404 12429 0.6

13230 13291 0.6

14117 14178 1.7

14117 14172 1.9

14117 14294 4.6

14117 14295 4.6

14117 14296 4.6

14117 14293 4.7

14117 14297 4.7

14117 14173 8.0

獲取線程14297十六進(jìn)制，后面會(huì)在jstack里面用到

[ocnosql@server01 logs]$ printf "%x\n" 14297

37d9

然后根據(jù)jstack查看cpu使用為4.7%的線程id14297，進(jìn)程id14117，獲取jstack信息：

[ocnosql@server01 logs]$ jstack 14117 > jstack.log

然后vi jstack.log，查找線程id為37d9的線程

"TestClient-4" #40 prio=5 os_prio=0 tid=0x00007fefc0539000 nid=0x37d9 runnable [0x00007fefa73f9000]

java.lang.Thread.State: RUNNABLE

at org.apache.hadoop.hbase.util.Bytes$LexicographicalComparerHolder$UnsafeComparer.compareTo(Bytes.java:1276)

at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:1187)

at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:153)

at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:142)

at java.util.concurrent.ConcurrentSkipListMap.cpr(ConcurrentSkipListMap.java:655)

at java.util.concurrent.ConcurrentSkipListMap.findNear(ConcurrentSkipListMap.java:1247)

at java.util.concurrent.ConcurrentSkipListMap.getNear(ConcurrentSkipListMap.java:1268)

at java.util.concurrent.ConcurrentSkipListMap.floorEntry(ConcurrentSkipListMap.java:2153)

at org.apache.hadoop.hbase.client.MetaCache.getCachedLocation(MetaCache.java:74)

at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.getCachedLocation(ConnectionManager.java:1313)

at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1157)

at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1109)

at org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:369)

at org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:320)

at org.apache.hadoop.hbase.client.BufferedMutatorImpl.backgroundFlushCommits(BufferedMutatorImpl.java:198)

at org.apache.hadoop.hbase.client.BufferedMutatorImpl.doMutate(BufferedMutatorImpl.java:141)

at org.apache.hadoop.hbase.client.BufferedMutatorImpl.mutate(BufferedMutatorImpl.java:98)

- locked <0x00000000c6ccc800> (a org.apache.hadoop.hbase.client.BufferedMutatorImpl)

at org.apache.hadoop.hbase.PerformanceEvaluation$RandomWriteTest.testRow(PerformanceEvaluation.java:1384)

at org.apache.hadoop.hbase.PerformanceEvaluation$Test.testTimed(PerformanceEvaluation.java:1071)

at org.apache.hadoop.hbase.PerformanceEvaluation$Test.test(PerformanceEvaluation.java:1053)

at org.apache.hadoop.hbase.PerformanceEvaluation.runOneClient(PerformanceEvaluation.java:1612)

at org.apache.hadoop.hbase.PerformanceEvaluation$1.call(PerformanceEvaluation.java:410)

at org.apache.hadoop.hbase.PerformanceEvaluation$1.call(PerformanceEvaluation.java:405)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

可以看到此線程正在執(zhí)行put操作，是基準(zhǔn)測(cè)試中的一個(gè)client，符合我們的預(yù)期。

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