[jira] [Commented] (HDFS-12787) Ozone: SCM: Aggregate the metrics from all the container reports

[ https://issues.apache.org/jira/browse/HDFS-12787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259058#comment-16259058 ] Hadoop QA commented on HDFS-12787: -- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem ||

[jira] [Commented] (HDFS-12820) Decommissioned datanode is counted in service cause datanode allcating failure

[ https://issues.apache.org/jira/browse/HDFS-12820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16258981#comment-16258981 ] Gang Xie commented on HDFS-12820: - Why we don't substract nodesInService when we complete the decommission

[jira] [Reopened] (HDFS-12820) Decommissioned datanode is counted in service cause datanode allcating failure

[ https://issues.apache.org/jira/browse/HDFS-12820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Gang Xie reopened HDFS-12820: - After carefully check the issue reported in HDFS-9279, and found this issue is not a its dup. this case is

[jira] [Commented] (HDFS-12820) Decommissioned datanode is counted in service cause datanode allcating failure

[ https://issues.apache.org/jira/browse/HDFS-12820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16258975#comment-16258975 ] Gang Xie commented on HDFS-12820: - And I believe this issue still in the latest version > Decommissioned

[jira] [Comment Edited] (HDFS-12820) Decommissioned datanode is counted in service cause datanode allcating failure

[ https://issues.apache.org/jira/browse/HDFS-12820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16258974#comment-16258974 ] Gang Xie edited comment on HDFS-12820 at 11/20/17 9:11 AM: --- After carefully

[jira] [Updated] (HDFS-12740) SCM should support a RPC to share the cluster Id with KSM and DataNodes

[ https://issues.apache.org/jira/browse/HDFS-12740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Shashikant Banerjee updated HDFS-12740: --- Attachment: HDFS-12740-HDFS-7240.004.patch Rebased patch v3. > SCM should support a

[jira] [Commented] (HDFS-12740) SCM should support a RPC to share the cluster Id with KSM and DataNodes

[ https://issues.apache.org/jira/browse/HDFS-12740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259142#comment-16259142 ] Hadoop QA commented on HDFS-12740: -- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem ||

[jira] [Commented] (HDFS-12832) INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to NameNode exit

[ https://issues.apache.org/jira/browse/HDFS-12832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259458#comment-16259458 ] Erik Krogen commented on HDFS-12832: Thanks for reporting this and for working on a patch, [~Deng

[jira] [Comment Edited] (HDFS-12832) INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to NameNode exit

[ https://issues.apache.org/jira/browse/HDFS-12832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259458#comment-16259458 ] Erik Krogen edited comment on HDFS-12832 at 11/20/17 4:42 PM: -- Thanks for

[jira] [Commented] (HDFS-12711) deadly hdfs test

[ https://issues.apache.org/jira/browse/HDFS-12711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259536#comment-16259536 ] Allen Wittenauer commented on HDFS-12711: - FYI HADOOP-13514. > deadly hdfs test >

[jira] [Updated] (HDFS-12836) startTxId could be greater than endTxId when tailing in-progress edit log

[ https://issues.apache.org/jira/browse/HDFS-12836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Wei-Chiu Chuang updated HDFS-12836: --- Affects Version/s: 3.0.0-alpha1 > startTxId could be greater than endTxId when tailing

[jira] [Commented] (HDFS-12836) startTxId could be greater than endTxId when tailing in-progress edit log

[ https://issues.apache.org/jira/browse/HDFS-12836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259559#comment-16259559 ] Wei-Chiu Chuang commented on HDFS-12836: Updated Affects Version/s based on the fix version of

[jira] [Updated] (HDFS-12730) Verify open files captured in the snapshots across config disable and enable

[ https://issues.apache.org/jira/browse/HDFS-12730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Manoj Govindassamy updated HDFS-12730: -- Resolution: Fixed Fix Version/s: 3.1.0 Status: Resolved (was: Patch

[jira] [Commented] (HDFS-12823) Backport HDFS-9259 "Make SO_SNDBUF size configurable at DFSClient" to branch-2.7

[ https://issues.apache.org/jira/browse/HDFS-12823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259393#comment-16259393 ] Erik Krogen commented on HDFS-12823: Thank you [~manojg] and [~zhz]! > Backport HDFS-9259 "Make

[jira] [Commented] (HDFS-12836) startTxId could be greater than endTxId when tailing in-progress edit log

[ https://issues.apache.org/jira/browse/HDFS-12836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259891#comment-16259891 ] Chao Sun commented on HDFS-12836: - This issue happens when not all NNs in the cluster enable the

[jira] [Commented] (HDFS-12641) Backport HDFS-11755 into branch-2.7 to fix a regression in HDFS-11445

[ https://issues.apache.org/jira/browse/HDFS-12641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259984#comment-16259984 ] Hadoop QA commented on HDFS-12641: -- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem ||

[jira] [Updated] (HDFS-10183) Prevent race condition during class initialization

[ https://issues.apache.org/jira/browse/HDFS-10183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Subru Krishnan updated HDFS-10183: -- Fix Version/s: (was: 2.9.0) 2.9.1 > Prevent race condition during class

[jira] [Commented] (HDFS-12832) INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to NameNode exit

[ https://issues.apache.org/jira/browse/HDFS-12832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259877#comment-16259877 ] Konstantin Shvachko commented on HDFS-12832: [~Deng FEI] could you please post the actual

[jira] [Commented] (HDFS-12641) Backport HDFS-11755 into branch-2.7 to fix a regression in HDFS-11445

[ https://issues.apache.org/jira/browse/HDFS-12641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16260010#comment-16260010 ] Wei-Chiu Chuang commented on HDFS-12641: Failed tests are due to jenkins OOM, doesn't appear

[jira] [Commented] (HDFS-12836) startTxId could be greater than endTxId when tailing in-progress edit log

[ https://issues.apache.org/jira/browse/HDFS-12836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259924#comment-16259924 ] Wei-Chiu Chuang commented on HDFS-12836: Thanks. From a supportability point of view that

[jira] [Commented] (HDFS-12794) Ozone: Parallelize ChunkOutputSream Writes to container

[ https://issues.apache.org/jira/browse/HDFS-12794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259970#comment-16259970 ] Hadoop QA commented on HDFS-12794: -- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem ||

[jira] [Commented] (HDFS-7240) Object store in HDFS

[ https://issues.apache.org/jira/browse/HDFS-7240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16260017#comment-16260017 ] Anu Engineer commented on HDFS-7240: h1. Ozone - First community meeting {{Time: Thursday, November 16,

[jira] [Created] (HDFS-12839) Refactor ratis-server tests to reduce the use DEFAULT_CALLID

Tsz Wo Nicholas Sze created HDFS-12839: -- Summary: Refactor ratis-server tests to reduce the use DEFAULT_CALLID Key: HDFS-12839 URL: https://issues.apache.org/jira/browse/HDFS-12839 Project:

[jira] [Commented] (HDFS-12740) SCM should support a RPC to share the cluster Id with KSM and DataNodes

[ https://issues.apache.org/jira/browse/HDFS-12740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259781#comment-16259781 ] Nanda kumar commented on HDFS-12740: Thanks [~shashikant] for updating the patch, it looks good to me.

[jira] [Comment Edited] (HDFS-12786) Ozone: add port/service names to the ksm/scm web ui

[ https://issues.apache.org/jira/browse/HDFS-12786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16257815#comment-16257815 ] Xiaoyu Yao edited comment on HDFS-12786 at 11/20/17 9:20 PM: - [~elek], thanks

[jira] [Commented] (HDFS-12804) Use slf4j instead of log4j in FSEditLog

[ https://issues.apache.org/jira/browse/HDFS-12804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259856#comment-16259856 ] Hudson commented on HDFS-12804: --- SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13261 (See

[jira] [Commented] (HDFS-12799) Ozone: SCM: Close containers: extend SCMCommandResponseProto with SCMCloseContainerCmdResponseProto

[ https://issues.apache.org/jira/browse/HDFS-12799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259729#comment-16259729 ] Chen Liang commented on HDFS-12799: --- Thanks for working on this [~elek]. Returning current state does

[jira] [Comment Edited] (HDFS-12794) Ozone: Parallelize ChunkOutputSream Writes to container

[ https://issues.apache.org/jira/browse/HDFS-12794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259728#comment-16259728 ] Shashikant Banerjee edited comment on HDFS-12794 at 11/20/17 7:43 PM: --

[jira] [Comment Edited] (HDFS-12794) Ozone: Parallelize ChunkOutputSream Writes to container

[ https://issues.apache.org/jira/browse/HDFS-12794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259728#comment-16259728 ] Shashikant Banerjee edited comment on HDFS-12794 at 11/20/17 7:57 PM: --

[jira] [Commented] (HDFS-12826) Document Saying the RPC port, But it's required IPC port in Balancer Document.

[ https://issues.apache.org/jira/browse/HDFS-12826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259763#comment-16259763 ] Chen Liang commented on HDFS-12826: --- Thanks [~peruguusha] for the patch! Would it be a bit more precise

[jira] [Commented] (HDFS-12807) Ozone: Expose RockDB stats via JMX for Ozone metadata stores

[ https://issues.apache.org/jira/browse/HDFS-12807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259709#comment-16259709 ] Hadoop QA commented on HDFS-12807: -- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem ||

[jira] [Commented] (HDFS-12171) Reduce IIP object allocations for inode lookup

[ https://issues.apache.org/jira/browse/HDFS-12171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259815#comment-16259815 ] Wei-Chiu Chuang commented on HDFS-12171: For future reference. The object allocation came from the

[jira] [Updated] (HDFS-12794) Ozone: Parallelize ChunkOutputSream Writes to container

[ https://issues.apache.org/jira/browse/HDFS-12794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Shashikant Banerjee updated HDFS-12794: --- Attachment: HDFS-12794-HDFS-7240.003.patch Thanks [~anu] , for the review comments.

[jira] [Comment Edited] (HDFS-12794) Ozone: Parallelize ChunkOutputSream Writes to container

[ https://issues.apache.org/jira/browse/HDFS-12794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259728#comment-16259728 ] Shashikant Banerjee edited comment on HDFS-12794 at 11/20/17 7:45 PM: --

[jira] [Comment Edited] (HDFS-12794) Ozone: Parallelize ChunkOutputSream Writes to container

[ https://issues.apache.org/jira/browse/HDFS-12794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259728#comment-16259728 ] Shashikant Banerjee edited comment on HDFS-12794 at 11/20/17 7:58 PM: --

[jira] [Updated] (HDFS-12787) Ozone: SCM: Aggregate the metrics from all the container reports

[ https://issues.apache.org/jira/browse/HDFS-12787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Xiaoyu Yao updated HDFS-12787: -- Resolution: Fixed Hadoop Flags: Reviewed Fix Version/s: HDFS-7240 Status:

[jira] [Commented] (HDFS-12730) Verify open files captured in the snapshots across config disable and enable

[ https://issues.apache.org/jira/browse/HDFS-12730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259768#comment-16259768 ] Hudson commented on HDFS-12730: --- SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13259 (See

[jira] [Updated] (HDFS-12804) Use slf4j instead of log4j in FSEditLog

[ https://issues.apache.org/jira/browse/HDFS-12804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Chen Liang updated HDFS-12804: -- Resolution: Fixed Status: Resolved (was: Patch Available) > Use slf4j instead of log4j in

[jira] [Commented] (HDFS-12804) Use slf4j instead of log4j in FSEditLog

[ https://issues.apache.org/jira/browse/HDFS-12804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259818#comment-16259818 ] Chen Liang commented on HDFS-12804: --- Thanks [~msingh] for the update, I tested locally also,

[jira] [Commented] (HDFS-12641) Backport HDFS-11755 into branch-2.7 to fix a regression in HDFS-11445

[ https://issues.apache.org/jira/browse/HDFS-12641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259820#comment-16259820 ] Wei-Chiu Chuang commented on HDFS-12641: The tests failures and warnings don't seem related.

[jira] [Created] (HDFS-12840) Creating a replicated file in a EC zone does not correctly serialized in EditLogs

Lei (Eddy) Xu created HDFS-12840: Summary: Creating a replicated file in a EC zone does not correctly serialized in EditLogs Key: HDFS-12840 URL: https://issues.apache.org/jira/browse/HDFS-12840

[jira] [Updated] (HDFS-12347) TestBalancerRPCDelay#testBalancerRPCDelay fails very frequently

[ https://issues.apache.org/jira/browse/HDFS-12347?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Xiao Chen updated HDFS-12347: - Summary: TestBalancerRPCDelay#testBalancerRPCDelay fails very frequently (was:

[jira] [Commented] (HDFS-10183) Prevent race condition during class initialization

[ https://issues.apache.org/jira/browse/HDFS-10183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16260111#comment-16260111 ] Hadoop QA commented on HDFS-10183: -- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem ||

[jira] [Updated] (HDFS-12813) RequestHedgingProxyProvider can hide Exception thrown from the Namenode for proxy size of 1

[ https://issues.apache.org/jira/browse/HDFS-12813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Tsz Wo Nicholas Sze updated HDFS-12813: --- Resolution: Fixed Fix Version/s: 2.10.0 3.0.0

[jira] [Commented] (HDFS-12832) INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to NameNode exit

[ https://issues.apache.org/jira/browse/HDFS-12832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16260198#comment-16260198 ] DENG FEI commented on HDFS-12832: - [~xkrogen] Has been uploaded on the stack, it happened at

[jira] [Updated] (HDFS-12840) Creating a replicated file in a EC zone does not correctly serialized in EditLogs

[ https://issues.apache.org/jira/browse/HDFS-12840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Lei (Eddy) Xu updated HDFS-12840: - Attachment: HDFS-12840.reprod.patch Attach the patch to reproduce this bug. Will post the fix

[jira] [Updated] (HDFS-12832) INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to NameNode exit

[ https://issues.apache.org/jira/browse/HDFS-12832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] DENG FEI updated HDFS-12832: Attachment: exception.log > INode.getFullPathName may throw ArrayIndexOutOfBoundsException lead to >

[jira] [Commented] (HDFS-12813) RequestHedgingProxyProvider can hide Exception thrown from the Namenode for proxy size of 1

[ https://issues.apache.org/jira/browse/HDFS-12813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16260134#comment-16260134 ] Hudson commented on HDFS-12813: --- SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13262 (See

[jira] [Comment Edited] (HDFS-12638) NameNode exits due to ReplicationMonitor thread received Runtime exception in ReplicationWork#chooseTargets

[ https://issues.apache.org/jira/browse/HDFS-12638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16256293#comment-16256293 ] Konstantin Shvachko edited comment on HDFS-12638 at 11/21/17 2:09 AM: --

[jira] [Updated] (HDFS-12740) SCM should support a RPC to share the cluster Id with KSM and DataNodes

[ https://issues.apache.org/jira/browse/HDFS-12740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Shashikant Banerjee updated HDFS-12740: --- Attachment: HDFS-12740-HDFS-7240.005.patch Thanks [~nandakumar131] for the review

[jira] [Updated] (HDFS-12740) SCM should support a RPC to share the cluster Id with KSM and DataNodes

[ https://issues.apache.org/jira/browse/HDFS-12740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Shashikant Banerjee updated HDFS-12740: --- Attachment: (was: HDFS-12740-HDFS-7240.005.patch) > SCM should support a RPC to

[jira] [Updated] (HDFS-12740) SCM should support a RPC to share the cluster Id with KSM and DataNodes

[ https://issues.apache.org/jira/browse/HDFS-12740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Shashikant Banerjee updated HDFS-12740: --- Attachment: HDFS-12740-HDFS-7240.005.patch > SCM should support a RPC to share the

[jira] [Updated] (HDFS-12681) Fold HdfsLocatedFileStatus into HdfsFileStatus

[ https://issues.apache.org/jira/browse/HDFS-12681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Chris Douglas updated HDFS-12681: - Attachment: HDFS-12681.13.patch Failing tests are due to resource exhaustion. Updated patch to

[jira] [Updated] (HDFS-12681) Make HdfsLocatedFileStatus a subtype of LocatedFileStatus

[ https://issues.apache.org/jira/browse/HDFS-12681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Chris Douglas updated HDFS-12681: - Summary: Make HdfsLocatedFileStatus a subtype of LocatedFileStatus (was: Fold

[jira] [Updated] (HDFS-12840) Creating a replicated file in a EC zone does not correctly serialized in EditLogs

[ https://issues.apache.org/jira/browse/HDFS-12840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Lei (Eddy) Xu updated HDFS-12840: - Labels: hdfs-ec-3.0-must-do (was: ) > Creating a replicated file in a EC zone does not correctly

[jira] [Updated] (HDFS-12838) Ozone: Optimize number of allocated block rpc by aggregating multiple block allocation requests

[ https://issues.apache.org/jira/browse/HDFS-12838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Mukul Kumar Singh updated HDFS-12838: - Status: Patch Available (was: Open) > Ozone: Optimize number of allocated block rpc by

[jira] [Updated] (HDFS-12840) Creating a replicated file in a EC zone does not correctly serialized in EditLogs

[ https://issues.apache.org/jira/browse/HDFS-12840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Lei (Eddy) Xu updated HDFS-12840: - Status: Patch Available (was: Open) > Creating a replicated file in a EC zone does not correctly

[jira] [Comment Edited] (HDFS-12794) Ozone: Parallelize ChunkOutputSream Writes to container

[ https://issues.apache.org/jira/browse/HDFS-12794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259728#comment-16259728 ] Shashikant Banerjee edited comment on HDFS-12794 at 11/20/17 7:50 PM: --

[jira] [Updated] (HDFS-12754) Lease renewal can hit a deadlock

[ https://issues.apache.org/jira/browse/HDFS-12754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Kuhu Shukla updated HDFS-12754: --- Attachment: HDFS-12754.008.patch Attaching patch that improves the test for better coordination

[jira] [Commented] (HDFS-12754) Lease renewal can hit a deadlock

[ https://issues.apache.org/jira/browse/HDFS-12754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16259251#comment-16259251 ] Hadoop QA commented on HDFS-12754: -- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem ||

[jira] [Updated] (HDFS-12807) Ozone: Expose RockDB stats via JMX for Ozone metadata stores

[ https://issues.apache.org/jira/browse/HDFS-12807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Elek, Marton updated HDFS-12807: Attachment: HDFS-12807-HDFS-7240.002.patch Second version. Fixed the case when the conf is null

[jira] [Updated] (HDFS-12807) Ozone: Expose RockDB stats via JMX for Ozone metadata stores

[ https://issues.apache.org/jira/browse/HDFS-12807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Elek, Marton updated HDFS-12807: Status: Patch Available (was: In Progress) > Ozone: Expose RockDB stats via JMX for Ozone metadata