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https://issues.apache.org/jira/browse/HDFS-8674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14603715#comment-14603715
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Hadoop QA commented on HDFS-8674:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch | 15m 16s | Findbugs (version ) appears to
be broken on trunk. |
| {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 30s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 9m 38s | There were no new javadoc
warning messages. |
| {color:green}+1{color} | release audit | 0m 22s | The applied patch does
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle | 0m 50s | 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 35s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 34s | The patch built with
eclipse:eclipse. |
| {color:red}-1{color} | findbugs | 3m 24s | The patch appears to introduce 1
new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native | 3m 14s | Pre-build of native portion |
| {color:green}+1{color} | hdfs tests | 162m 31s | Tests passed in hadoop-hdfs.
|
| | | 204m 57s | |
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12742164/HDFS-8674.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 60b858b |
| Findbugs warnings |
https://builds.apache.org/job/PreCommit-HDFS-Build/11502/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
|
| hadoop-hdfs test log |
https://builds.apache.org/job/PreCommit-HDFS-Build/11502/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HDFS-Build/11502/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/11502/console |
This message was automatically generated.
> Improve performance of postponed block scans
> --------------------------------------------
>
> Key: HDFS-8674
> URL: https://issues.apache.org/jira/browse/HDFS-8674
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: HDFS
> Affects Versions: 2.6.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HDFS-8674.patch
>
>
> When a standby goes active, it marks all nodes as "stale" which will cause
> block invalidations for over-replicated blocks to be queued until full block
> reports are received from the nodes with the block. The replication monitor
> scans the queue with O(N) runtime. It picks a random offset and iterates
> through the set to randomize blocks scanned.
> The result is devastating when a cluster loses multiple nodes during a
> rolling upgrade. Re-replication occurs, the nodes come back, the excess block
> invalidations are postponed. Rescanning just 2k blocks out of millions of
> postponed blocks may take multiple seconds. During the scan, the write lock
> is held which stalls all other processing.
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