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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9079) Erasure coding: preallocate multiple generation stamps and serialize updates from data streamers
Date Thu, 24 Sep 2015 09:07:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906070#comment-14906070
] 

Hadoop QA commented on HDFS-9079:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  18m 28s | Findbugs (version ) appears to be broken on
HDFS-7285. |
| {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:green}+1{color} | javac |   9m 16s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |  11m 45s | There were no new javadoc warning messages.
|
| {color:red}-1{color} | release audit |   0m 16s | The applied patch generated 1 release
audit warnings. |
| {color:green}+1{color} | checkstyle |   1m 10s | There were no new checkstyle issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 54s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 40s | The patch built with eclipse:eclipse.
|
| {color:red}-1{color} | findbugs |   5m 29s | The patch appears to introduce 5 new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 40s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests |  74m 27s | Tests failed in hadoop-hdfs. |
| {color:green}+1{color} | hdfs tests |   0m 36s | Tests passed in hadoop-hdfs-client. |
| | | 127m 48s | |
\\
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs |
| FindBugs | module:hadoop-hdfs-client |
| Failed unit tests | hadoop.hdfs.server.blockmanagement.TestSequentialBlockGroupId |
|   | hadoop.hdfs.TestLeaseRecovery2 |
|   | hadoop.hdfs.TestDFSStripedOutputStreamWithFailure |
|   | hadoop.hdfs.server.blockmanagement.TestBlockTokenWithDFSStriped |
|   | hadoop.hdfs.TestRecoverStripedFile |
|   | hadoop.hdfs.server.mover.TestMover |
|   | hadoop.hdfs.TestReadStripedFileWithMissingBlocks |
|   | hadoop.hdfs.server.balancer.TestBalancer |
| Timed out tests | org.apache.hadoop.hdfs.TestDFSRename |
\\
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12762065/HDFS-9079-HDFS-7285.00.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | HDFS-7285 / c09dc25 |
| Release Audit | https://builds.apache.org/job/PreCommit-HDFS-Build/12657/artifact/patchprocess/patchReleaseAuditProblems.txt
|
| Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/12657/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
|
| Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/12657/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs-client.html
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/12657/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| hadoop-hdfs-client test log | https://builds.apache.org/job/PreCommit-HDFS-Build/12657/artifact/patchprocess/testrun_hadoop-hdfs-client.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/12657/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf907.gq1.ygridcore.net 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 |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/12657/console |


This message was automatically generated.

> Erasure coding: preallocate multiple generation stamps and serialize updates from data
streamers
> ------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9079
>                 URL: https://issues.apache.org/jira/browse/HDFS-9079
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7285
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-9079-HDFS-7285.00.patch
>
>
> A non-striped DataStreamer goes through the following steps in error handling:
> {code}
> 1) Finds error => 2) Asks NN for new GS => 3) Gets new GS from NN => 4) Applies
new GS to DN (createBlockOutputStream) => 5) Ack from DN => 6) Updates block on NN
> {code}
> To simplify the above we can preallocate GS when NN creates a new striped block group
({{FSN#createNewBlock}}). For each new striped block group we can reserve {{NUM_PARITY_BLOCKS}}
GS's. Then steps 1~3 in the above sequence can be saved. If more than {{NUM_PARITY_BLOCKS}}
errors have happened we shouldn't try to further recover anyway.



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