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https://issues.apache.org/jira/browse/HDFS-14973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976826#comment-16976826
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Hadoop QA commented on HDFS-14973:
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| (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
51s{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:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 3 new or modified test
files. {color} |
|| || || || {color:brown} branch-2 Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 9m
4s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
54s{color} | {color:green} branch-2 passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
46s{color} | {color:green} branch-2 passed with JDK v1.8.0_222 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
38s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m
55s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m
4s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
10s{color} | {color:green} branch-2 passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
43s{color} | {color:green} branch-2 passed with JDK v1.8.0_222 {color} |
|| || || || {color:brown} Patch Compile Tests {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
50s{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
50s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
43s{color} | {color:green} the patch passed with JDK v1.8.0_222 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
43s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
0m 34s{color} | {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch
generated 2 new + 644 unchanged - 1 fixed = 646 total (was 645) {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} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green} 0m
2s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m
6s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
10s{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
47s{color} | {color:green} the patch passed with JDK v1.8.0_222 {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 82m 16s{color}
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m
28s{color} | {color:red} The patch generated 2 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}110m 11s{color} |
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests |
hadoop.hdfs.server.namenode.snapshot.TestSnapshotFileLength |
| | hadoop.hdfs.qjournal.server.TestJournalNodeRespectsBindHostKeys |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.5 Server=19.03.5 Image:yetus/hadoop:f555aa740b5 |
| JIRA Issue | HDFS-14973 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12986141/HDFS-14973-branch-2.003.patch
|
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient findbugs checkstyle xml |
| uname | Linux 3502fbd10de3 4.15.0-66-generic #75-Ubuntu SMP Tue Oct 1
05:24:09 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | branch-2 / a74411e |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_222 |
| Multi-JDK versions | /usr/lib/jvm/java-7-openjdk-amd64:1.7.0_95
/usr/lib/jvm/java-8-openjdk-amd64:1.8.0_222 |
| findbugs | v3.0.0 |
| checkstyle |
https://builds.apache.org/job/PreCommit-HDFS-Build/28328/artifact/out/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
|
| unit |
https://builds.apache.org/job/PreCommit-HDFS-Build/28328/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HDFS-Build/28328/testReport/ |
| asflicense |
https://builds.apache.org/job/PreCommit-HDFS-Build/28328/artifact/out/patch-asflicense-problems.txt
|
| Max. process+thread count | 2169 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U:
hadoop-hdfs-project/hadoop-hdfs |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/28328/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> Balancer getBlocks RPC dispersal does not function properly
> -----------------------------------------------------------
>
> Key: HDFS-14973
> URL: https://issues.apache.org/jira/browse/HDFS-14973
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Affects Versions: 2.9.0, 2.7.4, 2.8.2, 3.0.0
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Fix For: 3.3.0, 3.1.4, 3.2.2
>
> Attachments: HDFS-14973-branch-2.003.patch, HDFS-14973.000.patch,
> HDFS-14973.001.patch, HDFS-14973.002.patch, HDFS-14973.003.patch,
> HDFS-14973.test.patch
>
>
> In HDFS-11384, a mechanism was added to make the {{getBlocks}} RPC calls
> issued by the Balancer/Mover more dispersed, to alleviate load on the
> NameNode, since {{getBlocks}} can be very expensive and the Balancer should
> not impact normal cluster operation.
> Unfortunately, this functionality does not function as expected, especially
> when the dispatcher thread count is low. The primary issue is that the delay
> is applied only to the first N threads that are submitted to the dispatcher's
> executor, where N is the size of the dispatcher's threadpool, but *not* to
> the first R threads, where R is the number of allowed {{getBlocks}} QPS
> (currently hardcoded to 20). For example, if the threadpool size is 100 (the
> default), threads 0-19 have no delay, 20-99 have increased levels of delay,
> and 100+ have no delay. As I understand it, the intent of the logic was that
> the delay applied to the first 100 threads would force the dispatcher
> executor's threads to all be consumed, thus blocking subsequent (non-delayed)
> threads until the delay period has expired. However, threads 0-19 can finish
> very quickly (their work can often be fulfilled in the time it takes to
> execute a single {{getBlocks}} RPC, on the order of tens of milliseconds),
> thus opening up 20 new slots in the executor, which are then consumed by
> non-delayed threads 100-119, and so on. So, although 80 threads have had a
> delay applied, the non-delay threads rush through in the 20 non-delay slots.
> This problem gets even worse when the dispatcher threadpool size is less than
> the max {{getBlocks}} QPS. For example, if the threadpool size is 10, _no
> threads ever have a delay applied_, and the feature is not enabled at all.
> This problem wasn't surfaced in the original JIRA because the test
> incorrectly measured the period across which {{getBlocks}} RPCs were
> distributed. The variables {{startGetBlocksTime}} and {{endGetBlocksTime}}
> were used to track the time over which the {{getBlocks}} calls were made.
> However, {{startGetBlocksTime}} was initialized at the time of creation of
> the {{FSNameystem}} spy, which is before the mock DataNodes are started. Even
> worse, the Balancer in this test takes 2 iterations to complete balancing the
> cluster, so the time period {{endGetBlocksTime - startGetBlocksTime}}
> actually represents:
> {code}
> (time to submit getBlocks RPCs) + (DataNode startup time) + (time for the
> Dispatcher to complete an iteration of moving blocks)
> {code}
> Thus, the RPC QPS reported by the test is much lower than the RPC QPS seen
> during the period of initial block fetching.
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