[jira] [Created] (HBASE-21256) Improve IntegrationTestBigLinkedList for testing huge data

["Zephyr Guo (JIRA)" <ji...@apache.org>]

Zephyr Guo created HBASE-21256:
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             Summary: Improve IntegrationTestBigLinkedList for testing huge data
                 Key: HBASE-21256
                 URL: https://issues.apache.org/jira/browse/HBASE-21256
             Project: HBase
          Issue Type: Improvement
          Components: integration tests
    Affects Versions: 3.0.0
            Reporter: Zephyr Guo
            Assignee: Zephyr Guo
             Fix For: 3.0.0
         Attachments: ITBLL-1.png, ITBLL-2.png

Recently, I use ITBLL to test some features in our company. I have encountered the following problems:
  
 1. Generator is too slow at the generating stage, the root cause is SecureRandom. There is a global lock in SecureRandom( See the following picture). I use Random instead of SecureRandom, and it could speed up this stage(500% up with 20 mapper).  SecureRandom was brought by HBASE-13382, but speaking of generating random bytes, in my opnion,
 it is the same with Random.

!ITBLL-1.png!

2. VerifyReducer have a cpu cost of 14% on format method. This is cause by create keyString variable. However, keyString is never be used if test result is correct.(and that's in most cases). Just delay creating keyString can yield huge performance boost in verifing stage.

!ITBLL-2.png!

3.Arguments check is needed, because there's constraint between arguments. If we broken this constraint, we can not get a correct circular list.  
  
 4.Let big family value size could be configured.



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