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https://issues.apache.org/jira/browse/HDFS-15150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17363289#comment-17363289
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Hadoop QA commented on HDFS-15150:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 21m
37s{color} | {color:blue}{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} || ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green} 0m
1s{color} | {color:green}{color} | {color:green} No case conflicting files
found. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green}{color} | {color:green} The patch does not contain any
@author tags. {color} |
| {color:green}+1{color} | {color:green} {color} | {color:green} 0m 0s{color}
| {color:green}test4tests{color} | {color:green} The patch appears to include 7
new or modified test files. {color} |
|| || || || {color:brown} branch-2.10 Compile Tests {color} || ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 2m
18s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for
branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 12m
51s{color} | {color:green}{color} | {color:green} branch-2.10 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 13m
58s{color} | {color:green}{color} | {color:green} branch-2.10 passed with JDK
Azul Systems, Inc.-1.7.0_262-b10 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 11m
9s{color} | {color:green}{color} | {color:green} branch-2.10 passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 2m
6s{color} | {color:green}{color} | {color:green} branch-2.10 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
24s{color} | {color:green}{color} | {color:green} branch-2.10 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
33s{color} | {color:green}{color} | {color:green} branch-2.10 passed with JDK
Azul Systems, Inc.-1.7.0_262-b10 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
54s{color} | {color:green}{color} | {color:green} branch-2.10 passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 14m
37s{color} | {color:blue}{color} | {color:blue} Both FindBugs and SpotBugs are
enabled, using SpotBugs. {color} |
| {color:red}-1{color} | {color:red} spotbugs {color} | {color:red} 2m
2s{color} |
{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/621/artifact/out/branch-spotbugs-hadoop-common-project_hadoop-common-warnings.html{color}
| {color:red} hadoop-common-project/hadoop-common in branch-2.10 has 2 extant
spotbugs warnings. {color} |
| {color:red}-1{color} | {color:red} spotbugs {color} | {color:red} 2m
36s{color} |
{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/621/artifact/out/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html{color}
| {color:red} hadoop-hdfs-project/hadoop-hdfs in branch-2.10 has 1 extant
spotbugs warnings. {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
18s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for
patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
39s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 13m
20s{color} | {color:green}{color} | {color:green} the patch passed with JDK
Azul Systems, Inc.-1.7.0_262-b10 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 13m
20s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 11m
15s{color} | {color:green}{color} | {color:green} the patch passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 11m
15s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 2m
5s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
19s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green}{color} | {color:green} The patch has no whitespace
issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green} 0m
1s{color} | {color:green}{color} | {color:green} The patch has no ill-formed
XML file. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
44s{color} | {color:green}{color} | {color:green} the patch passed with JDK
Azul Systems, Inc.-1.7.0_262-b10 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
0s{color} | {color:green}{color} | {color:green} the patch passed with JDK
Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green} 5m
35s{color} | {color:green}{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 10m 39s{color}
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{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/621/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt{color}
| {color:red} hadoop-common in the patch failed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 84m 18s{color}
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{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/621/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt{color}
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 1m
36s{color} | {color:green}{color} | {color:green} The patch does not generate
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}218m 43s{color} |
{color:black}{color} | {color:black}{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.log.TestLogLevel |
| | hadoop.hdfs.TestDecommission |
| | hadoop.hdfs.TestPread |
| | hadoop.hdfs.server.datanode.TestDirectoryScanner |
| | hadoop.hdfs.qjournal.server.TestJournalNodeRespectsBindHostKeys |
| | hadoop.hdfs.server.datanode.TestBlockRecovery |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.41 ServerAPI=1.41 base:
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/621/artifact/out/Dockerfile
|
| JIRA Issue | HDFS-15150 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/13026820/HDFS-15150-branch-2.10.001.patch
|
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite
unit shadedclient findbugs checkstyle spotbugs xml |
| uname | Linux e6b24b28b3aa 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28
05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | branch-2.10 / f22ff63 |
| Default Java | Private Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10 |
| Multi-JDK versions | /usr/lib/jvm/zulu-7-amd64:Azul Systems,
Inc.-1.7.0_262-b10 /usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_292-8u292-b10-0ubuntu1~16.04.1-b10 |
| Test Results |
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/621/testReport/ |
| Max. process+thread count | 2119 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs U: . |
| Console output |
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/621/console |
| versions | git=2.7.4 maven=3.3.9 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |
This message was automatically generated.
> Introduce read write lock to Datanode
> -------------------------------------
>
> Key: HDFS-15150
> URL: https://issues.apache.org/jira/browse/HDFS-15150
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.3.0
> Reporter: Stephen O'Donnell
> Assignee: Stephen O'Donnell
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HDFS-15150-branch-2.10.001.patch, HDFS-15150.001.patch,
> HDFS-15150.002.patch, HDFS-15150.003.patch
>
>
> HDFS-9668 pointed out the issues around the DN lock being a point of
> contention some time ago, but that Jira went in a direction of creating a new
> FSDataset implementation which is very risky, and activity on the Jira has
> stalled for a few years now. Edit: Looks like HDFS-9668 eventually went in a
> similar direction to what I was thinking, so I will review that Jira in more
> detail to see if this one is necessary.
> I feel there could be significant gains by moving to a ReentrantReadWrite
> lock within the DN. The current implementation is simply a ReentrantLock so
> any locker blocks all others.
> Once place I think a read lock would benefit us significantly, is when the DN
> is serving a lot of small blocks and there are jobs which perform a lot of
> reads. The start of reading any blocks right now takes the lock, but if we
> moved this to a read lock, many reads could do this at the same time.
> The first conservative step, would be to change the current lock and then
> make all accesses to it obtain the write lock. That way, we should keep the
> current behaviour and then we can selectively move some lock accesses to the
> readlock in separate Jiras.
> I would appreciate any thoughts on this, and also if anyone has attempted it
> before and found any blockers.
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