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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8863) The remaining space check in BlockPlacementPolicyDefault is flawed
Date Wed, 19 Aug 2015 06:18:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702562#comment-14702562
] 

Hadoop QA commented on HDFS-8863:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  16m  0s | Findbugs (version ) appears to be broken on
trunk. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any @author tags.
|
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to include 1 new
or modified test files. |
| {color:green}+1{color} | javac |   7m 58s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 55s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 25s | The applied patch does not increase
the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 32s | 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 36s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   2m 33s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 12s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests | 204m  2s | Tests failed in hadoop-hdfs. |
| | | 246m 51s | |
\\
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|| Reason || Tests ||
| Failed unit tests | hadoop.hdfs.TestReplaceDatanodeOnFailure |
|   | hadoop.hdfs.server.namenode.TestSecureNameNode |
|   | hadoop.hdfs.TestClientReportBadBlock |
|   | hadoop.hdfs.server.namenode.TestFileTruncate |
| Timed out tests | org.apache.hadoop.cli.TestHDFSCLI |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12751137/HDFS-8863.v3.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 30e342a |
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/12032/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/12032/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf909.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/12032/console |


This message was automatically generated.

> The remaining space check in BlockPlacementPolicyDefault is flawed
> ------------------------------------------------------------------
>
>                 Key: HDFS-8863
>                 URL: https://issues.apache.org/jira/browse/HDFS-8863
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>              Labels: 2.6.1-candidate
>         Attachments: HDFS-8863.patch, HDFS-8863.v2.patch, HDFS-8863.v3.patch
>
>
> The block placement policy calls {{DatanodeDescriptor#getRemaining(StorageType}}}} to
check whether the block is going to fit. Since the method is adding up all remaining spaces,
namenode can allocate a new block on a full node. This causes pipeline construction failure
and {{abandonBlock}}. If the cluster is nearly full, the client might hit this multiple times
and the write can fail permanently.



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