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Hadoop QA commented on HDFS-16456: ---------------------------------- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Logfile || Comment || | {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 46s{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 50s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for branch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m 51s{color} | {color:green}{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 22m 11s{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 32s{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 30s{color} | {color:green}{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 3m 19s{color} | {color:green}{color} | {color:green} trunk passed {color} | | {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 26m 50s{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 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} javadoc {color} | {color:green} 3m 30s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} | | {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 38m 35s{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 48s{color} | {color:green}{color} | {color:green} trunk passed {color} | || || || || {color:brown} Patch Compile Tests {color} || || | {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 27s{color} | {color:blue}{color} | {color:blue} Maven dependency ordering for patch {color} | | {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m 11s{color} | {color:green}{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 21m 45s{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} javac {color} | {color:green} 21m 45s{color} | {color:green}{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} compile {color} | {color:green} 19m 32s{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:green}+1{color} | {color:green} javac {color} | {color:green} 19m 32s{color} | {color:green}{color} | {color:green} the patch passed {color} | | {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange} 3m 27s{color} | {color:orange}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/760/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 23s{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 37s{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 25s{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 32s{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:green}+1{color} | {color:green} spotbugs {color} | {color:green} 6m 13s{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 13s{color} | {color:green}{color} | {color:green} hadoop-common in the patch passed. {color} | | {color:red}-1{color} | {color:red} unit {color} | {color:red}247m 5s{color} | {color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/760/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 10s{color} | {color:green}{color} | {color:green} The patch does not generate ASF License warnings. {color} | | {color:black}{color} | {color:black} {color} | {color:black}467m 34s{color} | {color:black}{color} | {color:black}{color} | \\ \\ || Subsystem || Report/Notes || | Docker | ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/760/artifact/out/Dockerfile | | JIRA Issue | HDFS-16456 | | JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/13040291/HDFS-16456.002.patch | | Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle | | uname | Linux 1421a371707f 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 / 007c2011efe | | 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/760/testReport/ | | Max. process+thread count | 3402 (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/760/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 > > > 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. > > -- This message was sent by Atlassian Jira (v8.20.1#820001) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org