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https://issues.apache.org/jira/browse/HDFS-16456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17496964#comment-17496964
]
Hadoop QA commented on HDFS-16456:
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|| Vote || Subsystem || Runtime || Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 1m
20s{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
0s{color} | {color:green}{color} | {color:green} No case conflicting files
found. {color} |
| {color:green}+1{color} | {color:green} {color} | {color:green} 0m 0s{color}
| {color:green}test4tests{color} | {color:green} The patch appears to include 2
new or modified test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} || ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m
47s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for
branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 21m
4s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 22m
23s{color} | {color:green}{color} | {color:green} trunk passed with JDK
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 19m
33s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 3m
28s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 3m
23s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
26m 48s{color} | {color:green}{color} | {color:green} branch has no errors when
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
21s{color} | {color:green}{color} | {color:green} trunk passed with JDK
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| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 3m
28s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private
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| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 38m
32s{color} | {color:blue}{color} | {color:blue} Both FindBugs and SpotBugs are
enabled, using SpotBugs. {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green} 5m
52s{color} | {color:green}{color} | {color:green} trunk passed {color} |
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| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
27s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for
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| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m
15s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 21m
38s{color} | {color:green}{color} | {color:green} the patch passed with JDK
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 21m 38s{color}
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{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/763/artifact/out/diff-compile-javac-root-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt{color}
| {color:red} root-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 with JDK
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 generated 2 new + 1815 unchanged - 0
fixed = 1817 total (was 1815) {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 19m
33s{color} | {color:green}{color} | {color:green} the patch passed with JDK
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 19m 33s{color}
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{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/763/artifact/out/diff-compile-javac-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt{color}
| {color:red} root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 with
JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 generated 2 new + 1690
unchanged - 0 fixed = 1692 total (was 1690) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
3m 30s{color} |
{color:orange}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/763/artifact/out/diff-checkstyle-root.txt{color}
| {color:orange} root: The patch generated 15 new + 155 unchanged - 0 fixed =
170 total (was 155) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 3m
20s{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} shadedclient {color} | {color:green}
19m 42s{color} | {color:green}{color} | {color:green} patch has no errors when
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
26s{color} | {color:green}{color} | {color:green} the patch passed with JDK
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 3m
29s{color} | {color:green}{color} | {color:green} the patch passed with JDK
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| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green} 6m
15s{color} | {color:green}{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 28m
4s{color} | {color:green}{color} | {color:green} hadoop-common in the patch
passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}259m 39s{color}
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{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/763/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
9s{color} | {color:green}{color} | {color:green} The patch does not generate
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}480m 52s{color} |
{color:black}{color} | {color:black}{color} |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.41 ServerAPI=1.41 base:
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/763/artifact/out/Dockerfile
|
| JIRA Issue | HDFS-16456 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/13040372/HDFS-16456.004.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite
unit shadedclient spotbugs checkstyle |
| uname | Linux e1c5d6e7ba5a 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9
23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 365375412fe |
| Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
| Multi-JDK versions |
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04
/usr/lib/jvm/java-8-openjdk-amd64:Private
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
| Test Results |
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/763/testReport/ |
| Max. process+thread count | 3655 (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/763/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |
This message was automatically generated.
> EC: Decommission a rack with only on dn will fail when the rack number is
> equal with replication
> ------------------------------------------------------------------------------------------------
>
> Key: HDFS-16456
> URL: https://issues.apache.org/jira/browse/HDFS-16456
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ec, namenode
> Affects Versions: 3.4.0
> Reporter: caozhiqiang
> Priority: Critical
> Attachments: HDFS-16456.001.patch, HDFS-16456.002.patch,
> HDFS-16456.003.patch, HDFS-16456.004.patch
>
>
> In below scenario, decommission will fail by TOO_MANY_NODES_ON_RACK reason:
> # Enable EC policy, such as RS-6-3-1024k.
> # The rack number in this cluster is equal with or less than the replication
> number(9)
> # A rack only has one DN, and decommission this DN.
> The root cause is in
> BlockPlacementPolicyRackFaultTolerant::getMaxNodesPerRack() function, it will
> give a limit parameter maxNodesPerRack for choose targets. In this scenario,
> the maxNodesPerRack is 1, which means each rack can only be chosen one
> datanode.
> {code:java}
> protected int[] getMaxNodesPerRack(int numOfChosen, int numOfReplicas) {
> ...
> // If more replicas than racks, evenly spread the replicas.
> // This calculation rounds up.
> int maxNodesPerRack = (totalNumOfReplicas - 1) / numOfRacks + 1;
> return new int[] {numOfReplicas, maxNodesPerRack};
> } {code}
> int maxNodesPerRack = (totalNumOfReplicas - 1) / numOfRacks + 1;
> here will be called, where totalNumOfReplicas=9 and numOfRacks=9
> When we decommission one dn which is only one node in its rack, the
> chooseOnce() in BlockPlacementPolicyRackFaultTolerant::chooseTargetInOrder()
> will throw NotEnoughReplicasException, but the exception will not be caught
> and fail to fallback to chooseEvenlyFromRemainingRacks() function.
> When decommission, after choose targets, verifyBlockPlacement() function will
> return the total rack number contains the invalid rack, and
> BlockPlacementStatusDefault::isPlacementPolicySatisfied() will return false
> and it will also cause decommission fail.
> {code:java}
> public BlockPlacementStatus verifyBlockPlacement(DatanodeInfo[] locs,
> int numberOfReplicas) {
> if (locs == null)
> locs = DatanodeDescriptor.EMPTY_ARRAY;
> if (!clusterMap.hasClusterEverBeenMultiRack()) {
> // only one rack
> return new BlockPlacementStatusDefault(1, 1, 1);
> }
> // Count locations on different racks.
> Set<String> racks = new HashSet<>();
> for (DatanodeInfo dn : locs) {
> racks.add(dn.getNetworkLocation());
> }
> return new BlockPlacementStatusDefault(racks.size(), numberOfReplicas,
> clusterMap.getNumOfRacks());
> } {code}
> {code:java}
> public boolean isPlacementPolicySatisfied() {
> return requiredRacks <= currentRacks || currentRacks >= totalRacks;
> }{code}
> According to the above description, we should make the below modify to fix it:
> # In startDecommission() or stopDecommission(), we should also change the
> numOfRacks in class NetworkTopology. Or choose targets may fail for the
> maxNodesPerRack is too small. And even choose targets success,
> isPlacementPolicySatisfied will also return false cause decommission fail.
> # In BlockPlacementPolicyRackFaultTolerant::chooseTargetInOrder(), the first
> chooseOnce() function should also be put in try..catch..., or it will not
> fallback to call chooseEvenlyFromRemainingRacks() when throw exception.
> # In verifyBlockPlacement, we need to remove invalid racks from total
> numOfRacks, or isPlacementPolicySatisfied() will return false and cause fail
> to reconstruct data.
>
>
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