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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8674) Improve performance of postponed block scans
Date Wed, 30 Nov 2016 22:55:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15710112#comment-15710112
] 

Hadoop QA commented on HDFS-8674:
---------------------------------

| (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 12s{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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  0s{color} | {color:red}
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} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 15m 46s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  5s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 23s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 21s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 13s{color}
| {color:green} trunk passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  1m 49s{color} | {color:red}
hadoop-hdfs-project/hadoop-hdfs in trunk has 1 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 41s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 49s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 49s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 49s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 30s{color}
| {color:green} hadoop-hdfs-project/hadoop-hdfs: The patch generated 0 new + 119 unchanged
- 2 fixed = 119 total (was 121) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 54s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 10s{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 56s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 39s{color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 74m 34s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 21s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}105m 37s{color} | {color:black}
{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.blockmanagement.TestNodeCount |
|   | hadoop.hdfs.server.blockmanagement.TestBlocksWithNotEnoughRacks |
|   | hadoop.hdfs.server.datanode.TestDataNodeUUID |
|   | hadoop.hdfs.server.datanode.TestDataNodeMultipleRegistrations |
|   | hadoop.hdfs.server.blockmanagement.TestReconstructStripedBlocksWithRackAwareness |
|   | hadoop.hdfs.server.blockmanagement.TestRBWBlockInvalidation |
|   | hadoop.hdfs.server.datanode.checker.TestThrottledAsyncChecker |
|   | hadoop.hdfs.server.balancer.TestBalancerWithHANameNodes |
|   | hadoop.hdfs.server.datanode.TestDataNodeMXBean |
|   | hadoop.hdfs.server.namenode.TestAddStripedBlockInFBR |
|   | hadoop.hdfs.TestLeaseRecoveryStriped |
|   | hadoop.hdfs.server.datanode.TestDirectoryScanner |
|   | hadoop.hdfs.server.namenode.snapshot.TestSnapshot |
|   | hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication |
|   | hadoop.hdfs.server.namenode.ha.TestDNFencing |
\\
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:a9ad5d6 |
| JIRA Issue | HDFS-8674 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12841132/HDFS-8674.trunk.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux 9ceb14463035 3.13.0-95-generic #142-Ubuntu SMP Fri Aug 12 17:00:09 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 3fd844b |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| findbugs | https://builds.apache.org/job/PreCommit-HDFS-Build/17715/artifact/patchprocess/branch-findbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/17715/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/17715/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/17715/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


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: namenode
>    Affects Versions: 2.6.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-8674.2.patch, HDFS-8674.patch, HDFS-8674.patch, HDFS-8674.trunk.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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