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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5761) DataNode fails to validate integrity for checksum type NULL when DataNode recovers
Date Sun, 03 May 2015 09:05:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525732#comment-14525732
] 

Hadoop QA commented on HDFS-5761:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 32s | 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:green}+1{color} | javac |   7m 25s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 32s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 23s | The applied patch does not increase
the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   2m 12s | 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 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   3m  7s | The patch does not introduce any new Findbugs
(version 2.0.3) warnings. |
| {color:green}+1{color} | native |   3m 13s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests | 165m 20s | Tests failed in hadoop-hdfs. |
| | | 207m 55s | |
\\
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|| Reason || Tests ||
| Failed unit tests | hadoop.hdfs.TestCrcCorruption |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12622648/HDFS-5761.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a319771 |
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/10723/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/10723/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf902.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/10723/console |


This message was automatically generated.

> DataNode fails to validate integrity for checksum type NULL when DataNode recovers 
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-5761
>                 URL: https://issues.apache.org/jira/browse/HDFS-5761
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 3.0.0
>            Reporter: Kousuke Saruta
>            Assignee: Kousuke Saruta
>         Attachments: HDFS-5761.patch
>
>
> When DataNode is down during writing blocks, the blocks are not filinalized and the next
time DataNode recovers, integrity validation will run.
> But if we use NULL for checksum algorithm (we can set NULL to dfs.checksum.type), DataNode
will fail to validate integrity and cannot be up. 
> The cause is in BlockPoolSlice#validateIntegrity.
> In the method, there is following code.
> {code}
> long numChunks = Math.min(
>           (blockFileLen + bytesPerChecksum - 1)/bytesPerChecksum, 
>           (metaFileLen - crcHeaderLen)/checksumSize);
> {code}
> When we choose NULL checksum, checksumSize is 0 so ArithmeticException will be thrown
and DataNode cannot be up.



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