[jira] [Commented] (HADOOP-12853) Change WASB documentation regarding page blob support

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

    [ https://issues.apache.org/jira/browse/HADOOP-12853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15171612#comment-15171612 ] 

Hadoop QA commented on HADOOP-12853:
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| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s {color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 19s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 19s {color} | {color:green} the patch passed {color} |
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| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 17s {color} | {color:green} Patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 1m 17s {color} | {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:0ca8df7 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12790433/HADOOP-12853.001.patch |
| JIRA Issue | HADOOP-12853 |
| Optional Tests |  asflicense  mvnsite  |
| uname | Linux 9c2cfcaf9f39 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / e3ac231 |
| modules | C: hadoop-tools/hadoop-azure U: hadoop-tools/hadoop-azure |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/8742/console |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |


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> Change WASB documentation regarding page blob support
> -----------------------------------------------------
>
>                 Key: HADOOP-12853
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12853
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/azure
>            Reporter: madhumita chakraborty
>            Assignee: madhumita chakraborty
>            Priority: Minor
>         Attachments: HADOOP-12853.001.patch
>
>
> WASB page blob support documentation in Features list at the top:
> Supports both page blobs (suitable for most use cases, such as MapReduce) and block blobs (suitable for continuous write use cases, such as an HBase write-ahead log).
> Which is actually the opposite. Block blobs are better for typical big data use cases, and page blobs were implemented to support the HBase WAL.
> It is also mentioned that
> "Page blobs can be used for other purposes beyond just HBase log files though."
> This is not strong enough because page blob has been tested only in context of HBase write ahead logs. They have not been broadly certified for use across the HDP stack, hence is not recommended for use as a general purpose file-system via Hadoop cluster



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