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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12334) Change Mode Of Copy Operation of HBase WAL Archiving to bypass Azure Storage Throttling after retries
Date Tue, 25 Aug 2015 21:34:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712018#comment-14712018
] 

Hadoop QA commented on HADOOP-12334:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  16m 22s | Pre-patch trunk compilation is healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any @author tags.
|
| {color:red}-1{color} | tests included |   0m  0s | 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:red}-1{color} | javac |   9m 24s | The patch appears to cause the build to fail.
|
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12752318/HADOOP-12334.2.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / eee0d45 |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/7525/console |


This message was automatically generated.

> Change Mode Of Copy Operation of HBase WAL Archiving to bypass Azure Storage Throttling
after retries
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-12334
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12334
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools
>            Reporter: Gaurav Kanade
>            Assignee: Gaurav Kanade
>         Attachments: HADOOP-12334.2.patch
>
>
> HADOOP-11693 mitigated the problem of HMaster aborting regionserver due to Azure Storage
Throttling event during HBase WAL archival. The way this was achieved was by applying an intensive
exponential retry when throttling occurred.
> As a second level of mitigation we will change the mode of copy operation if the operation
fails even after all retries -i.e. we will do a client side copy of the blob and then copy
it back to destination. This operation will not be subject to throttling and hence should
provide a stronger mitigation. However it is more expensive, hence we do it only in the case
we fail after all retries



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