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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11609) Some blocks can be permanently lost if nodes are decommissioned while dead
Date Mon, 01 May 2017 15:34:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15990963#comment-15990963
] 

Hadoop QA commented on HDFS-11609:
----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 18s{color} | {color:blue}
Docker mode activated. {color} |
| {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} test4tests {color} | {color:green}  0m  0s{color}
| {color:green} The patch appears to include 1 new or modified test files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 15m  6s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 52s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 40s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m  2s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 15s{color}
| {color:green} trunk passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  1m 47s{color} | {color:red}
hadoop-hdfs-project/hadoop-hdfs in trunk has 10 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 46s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m  0s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 50s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 50s{color} | {color:green}
the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  0m 39s{color}
| {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch generated 1 new + 149 unchanged
- 0 fixed = 150 total (was 149) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m  0s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 13s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m  0s{color}
| {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 53s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 41s{color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 78m 57s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 19s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}107m 48s{color} | {color:black}
{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.TestEncryptionZones |
|   | hadoop.hdfs.server.balancer.TestBalancer |
|   | hadoop.hdfs.server.namenode.TestMetadataVersionOutput |
|   | hadoop.hdfs.TestMaintenanceState |
|   | hadoop.hdfs.server.namenode.ha.TestPipelinesFailover |
|   | hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureReporting |
|   | hadoop.hdfs.server.namenode.TestStartup |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:0ac17dc |
| JIRA Issue | HDFS-11609 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12865583/HDFS-11609_v3.trunk.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux 003c4dcfd7fd 3.13.0-106-generic #153-Ubuntu SMP Tue Dec 6 15:44:32 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 64f68cb |
| Default Java | 1.8.0_121 |
| findbugs | v3.1.0-RC1 |
| findbugs | https://builds.apache.org/job/PreCommit-HDFS-Build/19248/artifact/patchprocess/branch-findbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html
|
| checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/19248/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/19248/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/19248/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/19248/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Some blocks can be permanently lost if nodes are decommissioned while dead
> --------------------------------------------------------------------------
>
>                 Key: HDFS-11609
>                 URL: https://issues.apache.org/jira/browse/HDFS-11609
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.7.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Blocker
>         Attachments: HDFS-11609.branch-2.patch, HDFS-11609.trunk.patch, HDFS-11609_v2.branch-2.patch,
HDFS-11609_v2.trunk.patch, HDFS-11609_v3.branch-2.7.patch, HDFS-11609_v3.branch-2.patch, HDFS-11609_v3.trunk.patch
>
>
> When all the nodes containing a replica of a block are decommissioned while they are
dead, they get decommissioned right away even if there are missing blocks. This behavior was
introduced by HDFS-7374.
> The problem starts when those decommissioned nodes are brought back online. The namenode
no longer shows missing blocks, which creates a false sense of cluster health. When the decommissioned
nodes are removed and reformatted, the block data is permanently lost. The namenode will report
missing blocks after the heartbeat recheck interval (e.g. 10 minutes) from the moment the
last node is taken down.
> There are multiple issues in the code. As some cause different behaviors in testing vs.
production, it took a while to reproduce it in a unit test. I will present analysis and proposal
soon.



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