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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14089) Remove unnecessary draw of system entropy from RecoverableZooKeeper
Date Wed, 15 Jul 2015 20:04:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628635#comment-14628635
] 

Hadoop QA commented on HBASE-14089:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12745484/HBASE-14089.patch
  against master branch at commit a63e3ac83ffb91948f464e4f62111d29adc02812.
  ATTACHMENT ID: 12745484

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 hadoop versions{color}. The patch compiles with all supported hadoop versions
(2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.7.0)

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the total number of
protoc compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the total number
of checkstyle errors

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/14785//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/14785//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/14785//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/14785//console

This message is automatically generated.

> Remove unnecessary draw of system entropy from RecoverableZooKeeper
> -------------------------------------------------------------------
>
>                 Key: HBASE-14089
>                 URL: https://issues.apache.org/jira/browse/HBASE-14089
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>             Fix For: 2.0.0, 0.98.14, 1.2.0, 1.1.2, 1.3.0, 1.0.3
>
>         Attachments: HBASE-14089.patch
>
>
> I had a look at instances where we use SecureRandom, which could block if insufficient
entropy, in the 0.98 and master branch code. (Random in contrast is a PRNG seeded by System#nanoTime,
it doesn't draw from system entropy.) Most uses are in encryption related code, our native
encryption and SSL, but we do also use SecureRandom for salting znode metadata in RecoverableZooKeeper#appendMetadata,
which is called whenever we do setData. Conceivably we could block unexpectedly when constructing
data to write out to a znode if entropy gets too low until more is available. 



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