[jira] [Commented] (HBASE-19164) Avoid UUID.randomUUID in tests

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-19164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324535#comment-16324535 ] 

Hadoop QA commented on HBASE-19164:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  4s{color} | {color:red} HBASE-19164 does not apply to master. Rebase required? Wrong Branch? See https://yetus.apache.org/documentation/0.6.0/precommit-patchnames for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HBASE-19164 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12897011/HBASE-19164.master.003.patch |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/11054/console |
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> Avoid UUID.randomUUID in tests
> ------------------------------
>
>                 Key: HBASE-19164
>                 URL: https://issues.apache.org/jira/browse/HBASE-19164
>             Project: HBase
>          Issue Type: Improvement
>          Components: test
>            Reporter: Mike Drob
>            Assignee: Sahil Aggarwal
>              Labels: beginner
>         Attachments: HBASE-19164.master.001.patch, HBASE-19164.master.002.patch, HBASE-19164.master.003.patch
>
>
> We have a lot of places in our test code where we use {{UUID.randomUUID}} to generate table names or paths for uniqueness. Unfortunately, this uses up a good chunk of system entropy, since Sun chose that random UUID's should use the NativePRNGBlocking implementation.
> We don't need to block on entropy for random bits to pick a random table name in a test, so we can use something that doesn't strain the system too much - secure random can be a source of problems on some VM or containers.



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