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https://issues.apache.org/jira/browse/HDFS-13788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16579790#comment-16579790
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genericqa commented on HDFS-13788:
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
42s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 28m
41s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
14s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
40m 54s{color} | {color:green} branch has no errors when building and testing
our client artifacts. {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
2s{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} shadedclient {color} | {color:green}
12m 10s{color} | {color:green} patch has no errors when building and testing
our client artifacts. {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
23s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black} 55m 41s{color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:ba1ab08 |
| JIRA Issue | HDFS-13788 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12935531/HDFS-13788.002.patch |
| Optional Tests | asflicense mvnsite |
| uname | Linux 8cba93d3b207 3.13.0-153-generic #203-Ubuntu SMP Thu Jun 14
08:52:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / d1830d8 |
| maven | version: Apache Maven 3.3.9 |
| Max. process+thread count | 312 (vs. ulimit of 10000) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U:
hadoop-hdfs-project/hadoop-hdfs |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/24773/console |
| Powered by | Apache Yetus 0.8.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> Update EC documentation about rack fault tolerance
> --------------------------------------------------
>
> Key: HDFS-13788
> URL: https://issues.apache.org/jira/browse/HDFS-13788
> Project: Hadoop HDFS
> Issue Type: Task
> Components: documentation, erasure-coding
> Affects Versions: 3.0.0
> Reporter: Xiao Chen
> Assignee: Kitti Nanasi
> Priority: Major
> Attachments: HDFS-13788.001.patch, HDFS-13788.002.patch
>
>
> From
> http://hadoop.apache.org/docs/r3.0.0/hadoop-project-dist/hadoop-hdfs/HDFSErasureCoding.html:
> {quote}
> For rack fault-tolerance, it is also important to have at least as many racks
> as the configured EC stripe width. For EC policy RS (6,3), this means
> minimally 9 racks, and ideally 10 or 11 to handle planned and unplanned
> outages. For clusters with fewer racks than the stripe width, HDFS cannot
> maintain rack fault-tolerance, but will still attempt to spread a striped
> file across multiple nodes to preserve node-level fault-tolerance.
> {quote}
> Theoretical minimum is 3 racks, and ideally 9 or more, so the document should
> be updated.
> (I didn't check timestamps, but this is probably due to
> {{BlockPlacementPolicyRackFaultTolerant}} isn't completely done when
> HDFS-9088 introduced this doc. Later there's also examples in
> {{TestErasureCodingMultipleRacks}} to test this explicitly.)
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