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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8865) Improve quota initialization performance
Date Sat, 30 Sep 2017 16:01:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16187137#comment-16187137
] 

Hadoop QA commented on HDFS-8865:
---------------------------------

| (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 24s{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 2 new or modified test files. {color} |
|| || || || {color:brown} branch-2.7 Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  6m 44s{color}
| {color:green} branch-2.7 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 13s{color} |
{color:green} branch-2.7 passed with JDK v1.8.0_144 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  8s{color} |
{color:green} branch-2.7 passed with JDK v1.7.0_151 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 32s{color}
| {color:green} branch-2.7 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m  5s{color} |
{color:green} branch-2.7 passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m  3s{color} |
{color:green} branch-2.7 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 11s{color} |
{color:green} branch-2.7 passed with JDK v1.8.0_144 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 51s{color} |
{color:green} branch-2.7 passed with JDK v1.7.0_151 {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 52s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 58s{color} |
{color:green} the patch passed with JDK v1.8.0_144 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 58s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 59s{color} |
{color:green} the patch passed with JDK v1.7.0_151 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 59s{color} | {color:green}
the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  0m 28s{color}
| {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch generated 1 new + 612 unchanged
- 3 fixed = 613 total (was 615) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 56s{color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  0s{color} | {color:red}
The patch has 60 line(s) that end in whitespace. Use git apply --whitespace=fix <<patch_file>>.
Refer https://git-scm.com/docs/git-apply {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green}  0m  0s{color} | {color:green}
The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m  7s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  2s{color} |
{color:green} the patch passed with JDK v1.8.0_144 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 55s{color} |
{color:green} the patch passed with JDK v1.7.0_151 {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}683m 58s{color} | {color:red}
hadoop-hdfs in the patch failed with JDK v1.7.0_151. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 13m 41s{color} | {color:red}
The patch generated 105 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}783m 16s{color} | {color:black}
{color} |
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|| Reason || Tests ||
| JDK v1.8.0_144 Failed junit tests | hadoop.hdfs.server.blockmanagement.TestNodeCount |
|   | hadoop.hdfs.server.namenode.snapshot.TestRenameWithSnapshots |
|   | hadoop.hdfs.server.namenode.TestDeadDatanode |
|   | hadoop.hdfs.server.datanode.TestDataNodeHotSwapVolumes |
| JDK v1.8.0_144 Timed out junit tests | org.apache.hadoop.hdfs.web.TestWebHdfsTokens |
| JDK v1.7.0_151 Failed junit tests | hadoop.hdfs.server.namenode.TestSaveNamespace |
|   | hadoop.hdfs.server.namenode.snapshot.TestSnapshotManager |
|   | hadoop.hdfs.server.namenode.TestMetadataVersionOutput |
|   | hadoop.hdfs.server.blockmanagement.TestComputeInvalidateWork |
|   | hadoop.hdfs.TestMissingBlocksAlert |
|   | hadoop.hdfs.security.TestDelegationTokenForProxyUser |
|   | hadoop.hdfs.server.namenode.TestSecurityTokenEditLog |
|   | hadoop.hdfs.server.namenode.TestNameNodeOptionParsing |
|   | hadoop.hdfs.server.namenode.TestGetBlockLocations |
|   | hadoop.hdfs.server.namenode.ha.TestStandbyBlockManagement |
|   | hadoop.hdfs.server.namenode.TestCreateEditsLog |
| JDK v1.7.0_151 Timed out junit tests | org.apache.hadoop.hdfs.server.namenode.ha.TestHAAppend
|
|   | org.apache.hadoop.hdfs.TestEncryptionZones |
|   | org.apache.hadoop.hdfs.TestLeaseRecovery2 |
|   | org.apache.hadoop.hdfs.server.namenode.TestStartup |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestPendingCorruptDnMessages |
|   | org.apache.hadoop.hdfs.tools.TestDFSAdminWithHA |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeResourceChecker |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshottableDirListing |
|   | org.apache.hadoop.hdfs.TestFileCreationEmpty |
|   | org.apache.hadoop.hdfs.server.namenode.TestDefaultBlockPlacementPolicy |
|   | org.apache.hadoop.hdfs.server.namenode.TestSecondaryNameNodeUpgrade |
|   | org.apache.hadoop.hdfs.qjournal.client.TestQuorumJournalManager |
|   | org.apache.hadoop.hdfs.tools.offlineImageViewer.TestOfflineImageViewer |
|   | org.apache.hadoop.hdfs.tools.offlineEditsViewer.TestOfflineEditsViewer |
|   | org.apache.hadoop.hdfs.TestDatanodeRegistration |
|   | org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestStandbyCheckpoints |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeHttpServer |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotDiffReport |
|   | org.apache.hadoop.hdfs.server.namenode.TestFileContextAcl |
|   | org.apache.hadoop.hdfs.TestDFSClientFailover |
|   | org.apache.hadoop.hdfs.TestSetrepDecreasing |
|   | org.apache.hadoop.hdfs.TestReservedRawPaths |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeRecovery |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotListing |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotFileLength |
|   | org.apache.hadoop.hdfs.server.namenode.TestAddBlockRetry |
|   | org.apache.hadoop.hdfs.TestReplaceDatanodeOnFailure |
|   | org.apache.hadoop.hdfs.server.namenode.TestNamenodeCapacityReport |
|   | org.apache.hadoop.hdfs.server.namenode.TestDecommissioningStatus |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestBootstrapStandbyWithQJM |
|   | org.apache.hadoop.hdfs.server.namenode.TestStorageRestore |
|   | org.apache.hadoop.hdfs.server.namenode.TestLeaseManager |
|   | org.apache.hadoop.hdfs.qjournal.server.TestJournalNode |
|   | org.apache.hadoop.hdfs.TestQuota |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestOpenFilesWithSnapshot |
|   | org.apache.hadoop.hdfs.server.namenode.TestINodeFile |
|   | org.apache.hadoop.hdfs.server.namenode.TestEditLog |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeAcl |
|   | org.apache.hadoop.hdfs.TestDataTransferKeepalive |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSetQuotaWithSnapshot |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestEditLogTailer |
|   | org.apache.hadoop.hdfs.TestDatanodeDeath |
|   | org.apache.hadoop.hdfs.server.namenode.TestValidateConfigurationSettings |
|   | org.apache.hadoop.hdfs.TestFileLengthOnClusterRestart |
|   | org.apache.hadoop.hdfs.TestFileAppend |
|   | org.apache.hadoop.hdfs.TestPread |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestXAttrWithSnapshot |
|   | org.apache.hadoop.hdfs.server.namenode.TestNNThroughputBenchmark |
|   | org.apache.hadoop.hdfs.server.namenode.TestBackupNode |
|   | org.apache.hadoop.hdfs.server.namenode.TestFSImage |
|   | org.apache.hadoop.hdfs.TestSafeMode |
|   | org.apache.hadoop.hdfs.server.namenode.TestQuotaByStorageType |
|   | org.apache.hadoop.hdfs.TestFsShellPermission |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestAclWithSnapshot |
|   | org.apache.hadoop.hdfs.TestFileAppend4 |
|   | org.apache.hadoop.hdfs.TestDFSFinalize |
|   | org.apache.hadoop.hdfs.server.namenode.TestStreamFile |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeRespectsBindHostKeys |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestStandbyIsHot |
|   | org.apache.hadoop.hdfs.TestRead |
|   | org.apache.hadoop.hdfs.qjournal.client.TestQJMWithFaults |
|   | org.apache.hadoop.hdfs.TestDFSUpgradeFromImage |
|   | org.apache.hadoop.hdfs.server.namenode.TestFileContextXAttr |
|   | org.apache.hadoop.hdfs.server.namenode.TestFSImageWithXAttr |
|   | org.apache.hadoop.hdfs.TestDFSPermission |
|   | org.apache.hadoop.hdfs.web.TestWebHdfsTokens |
|   | org.apache.hadoop.hdfs.server.namenode.TestFSNamesystemMBean |
|   | org.apache.hadoop.hdfs.server.namenode.TestCacheDirectives |
|   | org.apache.hadoop.hdfs.TestDatanodeStartupFixesLegacyStorageIDs |
|   | org.apache.hadoop.hdfs.server.namenode.TestFSImageWithSnapshot |
|   | org.apache.hadoop.hdfs.security.TestDelegationToken |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeXAttr |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotBlocksMap |
|   | org.apache.hadoop.hdfs.server.namenode.TestFileLimit |
|   | org.apache.hadoop.hdfs.TestFileCorruption |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshot |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestRenameWithSnapshots |
|   | org.apache.hadoop.hdfs.server.namenode.TestFsck |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestFailoverWithBlockTokensEnabled |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestInitializeSharedEdits |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencing |
|   | org.apache.hadoop.hdfs.TestCrcCorruption |
|   | org.apache.hadoop.hdfs.TestFileCreationDelete |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotNameWithInvalidCharacters
|
|   | org.apache.hadoop.hdfs.TestEncryptionZonesWithKMS |
|   | org.apache.hadoop.hdfs.protocol.datatransfer.sasl.TestSaslDataTransfer |
|   | org.apache.hadoop.hdfs.server.blockmanagement.TestPendingInvalidateBlock |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestFailureToReadEdits |
|   | org.apache.hadoop.hdfs.qjournal.TestSecureNNWithQJM |
|   | org.apache.hadoop.hdfs.TestBlockStoragePolicy |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestNestedSnapshots |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotRename |
|   | org.apache.hadoop.hdfs.server.namenode.TestFileTruncate |
|   | org.apache.hadoop.hdfs.TestRollingUpgrade |
|   | org.apache.hadoop.hdfs.server.namenode.web.resources.TestWebHdfsDataLocality |
|   | org.apache.hadoop.hdfs.server.namenode.TestDiskspaceQuotaUpdate |
|   | org.apache.hadoop.hdfs.server.namenode.TestListCorruptFileBlocks |
|   | org.apache.hadoop.hdfs.server.namenode.TestTruncateQuotaUpdate |
|   | org.apache.hadoop.hdfs.server.namenode.TestDeadDatanode |
|   | org.apache.hadoop.hdfs.server.namenode.TestEditLogJournalFailures |
|   | org.apache.hadoop.hdfs.server.namenode.TestProcessCorruptBlocks |
|   | org.apache.hadoop.hdfs.TestDFSMkdirs |
|   | org.apache.hadoop.hdfs.server.namenode.TestParallelImageWrite |
|   | org.apache.hadoop.hdfs.TestLease |
|   | org.apache.hadoop.hdfs.server.namenode.TestFsckWithMultipleNameNodes |
|   | org.apache.hadoop.hdfs.server.namenode.TestMetaSave |
|   | org.apache.hadoop.hdfs.qjournal.TestNNWithQJM |
|   | org.apache.hadoop.hdfs.web.TestWebHDFS |
|   | org.apache.hadoop.hdfs.server.namenode.TestCommitBlockWithInvalidGenStamp |
|   | org.apache.hadoop.hdfs.server.namenode.TestINodeAttributeProvider |
|   | org.apache.hadoop.hdfs.server.namenode.TestCheckpoint |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeMXBean |
|   | org.apache.hadoop.hdfs.tools.TestDFSHAAdminMiniCluster |
|   | org.apache.hadoop.hdfs.tools.TestGetGroups |
|   | org.apache.hadoop.hdfs.server.blockmanagement.TestNodeCount |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameEditsConfigs |
|   | org.apache.hadoop.hdfs.web.TestWebHDFSXAttr |
|   | org.apache.hadoop.hdfs.TestRollingUpgradeRollback |
|   | org.apache.hadoop.hdfs.TestBlockReaderLocal |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestDFSZKFailoverController |
|   | org.apache.hadoop.hdfs.server.namenode.TestNamenodeRetryCache |
|   | org.apache.hadoop.hdfs.server.namenode.TestSnapshotPathINodes |
|   | org.apache.hadoop.hdfs.server.namenode.TestFSDirectory |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotReplication |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestDelegationTokensWithHA |
|   | org.apache.hadoop.hdfs.server.blockmanagement.TestRBWBlockInvalidation |
|   | org.apache.hadoop.hdfs.server.blockmanagement.TestReplicationPolicyWithNodeGroup |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication |
|   | org.apache.hadoop.hdfs.server.namenode.TestFSEditLogLoader |
|   | org.apache.hadoop.hdfs.shortcircuit.TestShortCircuitCache |
|   | org.apache.hadoop.hdfs.server.blockmanagement.TestPendingReplication |
|   | org.apache.hadoop.hdfs.server.namenode.TestFSImageWithAcl |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestHAStateTransitions |
|   | org.apache.hadoop.hdfs.server.namenode.TestXAttrConfigFlag |
|   | org.apache.hadoop.hdfs.shortcircuit.TestShortCircuitLocalRead |
|   | org.apache.hadoop.hdfs.server.namenode.TestHDFSConcat |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestEditLogsDuringFailover |
|   | org.apache.hadoop.hdfs.server.namenode.TestDeleteRace |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestRetryCacheWithHA |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestBootstrapStandby |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestDFSUpgradeWithHA |
|   | org.apache.hadoop.hdfs.server.namenode.TestEditLogRace |
|   | org.apache.hadoop.hdfs.server.namenode.TestAddBlock |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotDeletion |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestGetGroupsWithHA |
|   | org.apache.hadoop.hdfs.server.namenode.TestFavoredNodesEndToEnd |
|   | org.apache.hadoop.hdfs.web.TestFSMainOperationsWebHdfs |
|   | org.apache.hadoop.hdfs.server.namenode.TestBlockUnderConstruction |
|   | org.apache.hadoop.hdfs.TestBlockReaderFactory |
|   | org.apache.hadoop.hdfs.TestDistributedFileSystem |
|   | org.apache.hadoop.hdfs.server.blockmanagement.TestSequentialBlockId |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestPipelinesFailover |
|   | org.apache.hadoop.hdfs.web.TestWebHDFSForHA |
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestQuotasWithHA |
|   | org.apache.hadoop.hdfs.TestEncryptedTransfer |
|   | org.apache.hadoop.hdfs.TestDFSClientExcludedNodes |
|   | org.apache.hadoop.hdfs.server.namenode.TestAuditLogs |
|   | org.apache.hadoop.hdfs.TestDFSShell |
|   | org.apache.hadoop.hdfs.server.namenode.TestHostsFiles |
|   | org.apache.hadoop.hdfs.server.namenode.TestAuditLogger |
|   | org.apache.hadoop.hdfs.TestPersistBlocks |
|   | org.apache.hadoop.hdfs.tools.TestDebugAdmin |
|   | org.apache.hadoop.hdfs.server.namenode.TestNameNodeRetryCacheMetrics |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotMetrics |
|   | org.apache.hadoop.hdfs.server.namenode.snapshot.TestINodeFileUnderConstructionWithSnapshot
|
|   | org.apache.hadoop.hdfs.server.namenode.ha.TestHASafeMode |
|   | org.apache.hadoop.hdfs.server.namenode.TestCheckPointForSecurityTokens |
|   | org.apache.hadoop.hdfs.server.namenode.metrics.TestNameNodeMetrics |
|   | org.apache.hadoop.hdfs.TestGetFileChecksum |
|   | org.apache.hadoop.hdfs.web.TestWebHDFSAcl |
|   | org.apache.hadoop.hdfs.TestAbandonBlock |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:67e87c9 |
| JIRA Issue | HDFS-8865 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12889763/HDFS-8865.branch-2.7.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  shadedclient
 findbugs  checkstyle  xml  |
| uname | Linux e18536e63d2c 3.13.0-129-generic #178-Ubuntu SMP Fri Aug 11 12:48:20 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | branch-2.7 / 90aae39 |
| Default Java | 1.7.0_151 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_144 /usr/lib/jvm/java-7-openjdk-amd64:1.7.0_151
|
| findbugs | v3.0.0 |
| checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/21463/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
|
| whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/21463/artifact/patchprocess/whitespace-eol.txt
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/21463/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_151.txt
|
| JDK v1.7.0_151  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/21463/testReport/
|
| asflicense | https://builds.apache.org/job/PreCommit-HDFS-Build/21463/artifact/patchprocess/patch-asflicense-problems.txt
|
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/21463/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Improve quota initialization performance
> ----------------------------------------
>
>                 Key: HDFS-8865
>                 URL: https://issues.apache.org/jira/browse/HDFS-8865
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         Attachments: HDFS-8865_branch-2.6.patch, HDFS-8865.branch-2.6.patch, HDFS-8865_branch-2.7.patch,
HDFS-8865.branch-2.7.patch, HDFS-8865.patch, HDFS-8865.v2.checkstyle.patch, HDFS-8865.v2.patch,
HDFS-8865.v3.patch
>
>
> After replaying edits, the whole file system tree is recursively scanned in order to
initialize the quota. For big name space, this can take a very long time.  Since this is done
during namenode failover, it also affects failover latency.
> By using the Fork-Join framework, I was able to greatly reduce the initialization time.
 The following is the test result using the fsimage from one of the big name nodes we have.
> || threads || seconds||
> | 1 (existing) | 55|
> | 1 (fork-join) | 68 |
> | 4 | 16 |
> | 8 | 8 |
> | 12 | 6 |
> | 16 | 5 |
> | 20 | 4 |



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