Simplified Cluster Operation & Troubleshooting
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1. Apache Ambari is an open-source platform for provisioning, managing and monitoring Hadoop clusters. 2. New features in Ambari 2.4 include additional services, role-based access control, management packs and a Grafana UI for visualizing metrics. 3. Ambari simplifies cluster operations through deploying clusters via blueprints, automated Kerberos integration, host discovery and stack advisors. It also supports upgrading clusters with either rolling or express upgrades.
![Create a cluster with Blueprints
{
"configurations" : [
{
"hdfs-site" : {
"dfs.datanode.data.dir" : "/hadoop/1,
/hadoop/2,/hadoop/3"
}
}
],
"host_groups" : [
{
"name" : "master-host",
"components" : [
{ "name" : "NAMENODE” },
{ "name" : "RESOURCEMANAGER” },
…
],
"cardinality" : "1"
},
{
"name" : "worker-host",
"components" : [
{ "name" : "DATANODE" },
{ "name" : "NODEMANAGER” },
…
],
"cardinality" : "1+"
},
],
"Blueprints" : {
"stack_name" : "HDP",
"stack_version" : "2.5"
}
}
{
"blueprint" : "my-blueprint",
"host_groups" :[
{
"name" : "master-host",
"hosts" : [
{
"fqdn" : "master001.ambari.apache.org"
}
]
},
{
"name" : "worker-host",
"hosts" : [
{
"fqdn" : "worker001.ambari.apache.org"
},
{
"fqdn" : "worker002.ambari.apache.org"
},
…
{
"fqdn" : "worker099.ambari.apache.org"
}
]
}
]
}
1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster](https://image.slidesharecdn.com/june281220hortonworksluniya-160710194552/85/Simplified-Cluster-Operation-Troubleshooting-10-320.jpg)
![Create a cluster with Blueprints
{
"configurations" : [
{
"hdfs-site" : {
"dfs.datanode.data.dir" : "/hadoop/1,
/hadoop/2,/hadoop/3"
}
}
],
"host_groups" : [
{
"name" : "master-host",
"components" : [
{ "name" : "NAMENODE” },
{ "name" : "RESOURCEMANAGER” },
…
],
"cardinality" : "1"
},
{
"name" : "worker-host",
"components" : [
{ "name" : "DATANODE" },
{ "name" : "NODEMANAGER” },
…
],
"cardinality" : "1+"
},
],
"Blueprints" : {
"stack_name" : "HDP",
"stack_version" : "2.5"
}
}
{
"blueprint" : "my-blueprint",
"host_groups" :[
{
"name" : "master-host",
"hosts" : [
{
"fqdn" : "master001.ambari.apache.org"
}
]
},
{
"name" : "worker-host",
"hosts" : [
{
"fqdn" : "worker001.ambari.apache.org"
},
{
"fqdn" : "worker002.ambari.apache.org"
},
…
{
"fqdn" : "worker099.ambari.apache.org"
}
]
}
]
}
1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster](https://image.slidesharecdn.com/june281220hortonworksluniya-160710194552/85/Simplified-Cluster-Operation-Troubleshooting-11-320.jpg)
![Create a cluster with Blueprints
{
"configurations" : [
{
"hdfs-site" : {
"dfs.datanode.data.dir" : "/hadoop/1,
/hadoop/2,/hadoop/3"
}
}
],
"host_groups" : [
{
"name" : "master-host",
"components" : [
{ "name" : "NAMENODE” },
{ "name" : "RESOURCEMANAGER” },
…
],
"cardinality" : "1"
},
{
"name" : "worker-host",
"components" : [
{ "name" : "DATANODE" },
{ "name" : "NODEMANAGER” },
…
],
"cardinality" : "1+"
},
],
"Blueprints" : {
"stack_name" : "HDP",
"stack_version" : "2.5"
}
}
{
"blueprint" : "my-blueprint",
"host_groups" :[
{
"name" : "master-host",
"hosts" : [
{
"fqdn" : "master001.ambari.apache.org"
}
]
},
{
"name" : "worker-host",
"hosts" : [
{
"fqdn" : "worker001.ambari.apache.org"
},
{
"fqdn" : "worker002.ambari.apache.org"
},
…
{
"fqdn" : "worker099.ambari.apache.org"
}
]
}
]
}
1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster](https://image.slidesharecdn.com/june281220hortonworksluniya-160710194552/85/Simplified-Cluster-Operation-Troubleshooting-12-320.jpg)
![Create a cluster with Blueprints
{
"configurations" : [
{
"hdfs-site" : {
"dfs.datanode.data.dir" : "/hadoop/1,
/hadoop/2,/hadoop/3"
}
}
],
"host_groups" : [
{
"name" : "master-host",
"components" : [
{ "name" : "NAMENODE” },
{ "name" : "RESOURCEMANAGER” },
…
],
"cardinality" : "1"
},
{
"name" : "worker-host",
"components" : [
{ "name" : "DATANODE" },
{ "name" : "NODEMANAGER” },
…
],
"cardinality" : "1+"
},
],
"Blueprints" : {
"stack_name" : "HDP",
"stack_version" : "2.5"
}
}
{
"blueprint" : "my-blueprint",
"host_groups" :[
{
"name" : "master-host",
"hosts" : [
{
"fqdn" : "master001.ambari.apache.org"
}
]
},
{
"name" : "worker-host",
"hosts" : [
{
"fqdn" : "worker001.ambari.apache.org"
},
{
"fqdn" : "worker002.ambari.apache.org"
},
…
{
"fqdn" : "worker099.ambari.apache.org"
}
]
}
]
}
1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster](https://image.slidesharecdn.com/june281220hortonworksluniya-160710194552/85/Simplified-Cluster-Operation-Troubleshooting-13-320.jpg)
![POST /api/v1/clusters/MyCluster/hosts
[
{
"blueprint" : "single-node-hdfs-test2",
"host_groups" :[
{
"host_group" : "slave",
"host_count" : 3,
"host_predicate" : "Hosts/cpu_count>1”
}, {
"host_group" : "super-slave",
"host_count" : 5,
"host_predicate" : "Hosts/cpu_count>2&
Hosts/total_mem>3000000"
}
]
}
]
Blueprint Host Discovery](https://image.slidesharecdn.com/june281220hortonworksluniya-160710194552/85/Simplified-Cluster-Operation-Troubleshooting-15-320.jpg)
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Simplified Cluster Operation & Troubleshooting
- 1. Simplified Cluster Operation & Troubleshooting Alejandro Fernandez + Jayush Luniya
- 2. Speakers Alejandro Fernandez Sr. Software Engineer @ Hortonworks Apache Ambari PMC [email protected] Jayush Luniya Staff Engineer @ Hortonworks Apache Ambari PMC [email protected]
- 3. What is Apache Ambari? Apache Ambari is the open-source platform to provision, manage and monitor Hadoop clusters
- 4. New Enterprise Features Ambari 2.4 • New Services: Log Search, Zeppelin, Hive LLAP • Role Based Access Control • Management Packs • Grafana UI for Ambari Metrics System • New Views: Zeppelin, Storm
- 5. Apache Ambari Jiras April 2015 1690 1864 277 379 797 206 488 July - Sept 2015 Dec 2015 – Feb 2016 Today v2.0 v2.1 v2.2 v2.4 1542 and growing
- 6. Deploy Secure/L DAP Smart Configs Monitor Upgrade Scale, Extend, Analyze Simply Operations - Lifecycle Ease-of-Use Deploy
- 7. Deploy On Premise Ambari UI wizard handles all of these combinations and makes recommendations based on host specs.
- 8. Deploy On The Cloud Certified environments Sysprepped VMs Hundreds of similar clusters
- 9. Deploy with Blueprints • Systematic way of defining a cluster • Export existing cluster into blueprint /api/v1/clusters/:clusterName?format=blueprint Configs Topology Hosts Cluster
- 10. Create a cluster with Blueprints { "configurations" : [ { "hdfs-site" : { "dfs.datanode.data.dir" : "/hadoop/1, /hadoop/2,/hadoop/3" } } ], "host_groups" : [ { "name" : "master-host", "components" : [ { "name" : "NAMENODE” }, { "name" : "RESOURCEMANAGER” }, … ], "cardinality" : "1" }, { "name" : "worker-host", "components" : [ { "name" : "DATANODE" }, { "name" : "NODEMANAGER” }, … ], "cardinality" : "1+" }, ], "Blueprints" : { "stack_name" : "HDP", "stack_version" : "2.5" } } { "blueprint" : "my-blueprint", "host_groups" :[ { "name" : "master-host", "hosts" : [ { "fqdn" : "master001.ambari.apache.org" } ] }, { "name" : "worker-host", "hosts" : [ { "fqdn" : "worker001.ambari.apache.org" }, { "fqdn" : "worker002.ambari.apache.org" }, … { "fqdn" : "worker099.ambari.apache.org" } ] } ] } 1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster
- 11. Create a cluster with Blueprints { "configurations" : [ { "hdfs-site" : { "dfs.datanode.data.dir" : "/hadoop/1, /hadoop/2,/hadoop/3" } } ], "host_groups" : [ { "name" : "master-host", "components" : [ { "name" : "NAMENODE” }, { "name" : "RESOURCEMANAGER” }, … ], "cardinality" : "1" }, { "name" : "worker-host", "components" : [ { "name" : "DATANODE" }, { "name" : "NODEMANAGER” }, … ], "cardinality" : "1+" }, ], "Blueprints" : { "stack_name" : "HDP", "stack_version" : "2.5" } } { "blueprint" : "my-blueprint", "host_groups" :[ { "name" : "master-host", "hosts" : [ { "fqdn" : "master001.ambari.apache.org" } ] }, { "name" : "worker-host", "hosts" : [ { "fqdn" : "worker001.ambari.apache.org" }, { "fqdn" : "worker002.ambari.apache.org" }, … { "fqdn" : "worker099.ambari.apache.org" } ] } ] } 1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster
- 12. Create a cluster with Blueprints { "configurations" : [ { "hdfs-site" : { "dfs.datanode.data.dir" : "/hadoop/1, /hadoop/2,/hadoop/3" } } ], "host_groups" : [ { "name" : "master-host", "components" : [ { "name" : "NAMENODE” }, { "name" : "RESOURCEMANAGER” }, … ], "cardinality" : "1" }, { "name" : "worker-host", "components" : [ { "name" : "DATANODE" }, { "name" : "NODEMANAGER” }, … ], "cardinality" : "1+" }, ], "Blueprints" : { "stack_name" : "HDP", "stack_version" : "2.5" } } { "blueprint" : "my-blueprint", "host_groups" :[ { "name" : "master-host", "hosts" : [ { "fqdn" : "master001.ambari.apache.org" } ] }, { "name" : "worker-host", "hosts" : [ { "fqdn" : "worker001.ambari.apache.org" }, { "fqdn" : "worker002.ambari.apache.org" }, … { "fqdn" : "worker099.ambari.apache.org" } ] } ] } 1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster
- 13. Create a cluster with Blueprints { "configurations" : [ { "hdfs-site" : { "dfs.datanode.data.dir" : "/hadoop/1, /hadoop/2,/hadoop/3" } } ], "host_groups" : [ { "name" : "master-host", "components" : [ { "name" : "NAMENODE” }, { "name" : "RESOURCEMANAGER” }, … ], "cardinality" : "1" }, { "name" : "worker-host", "components" : [ { "name" : "DATANODE" }, { "name" : "NODEMANAGER” }, … ], "cardinality" : "1+" }, ], "Blueprints" : { "stack_name" : "HDP", "stack_version" : "2.5" } } { "blueprint" : "my-blueprint", "host_groups" :[ { "name" : "master-host", "hosts" : [ { "fqdn" : "master001.ambari.apache.org" } ] }, { "name" : "worker-host", "hosts" : [ { "fqdn" : "worker001.ambari.apache.org" }, { "fqdn" : "worker002.ambari.apache.org" }, … { "fqdn" : "worker099.ambari.apache.org" } ] } ] } 1. POST /api/v1/blueprints/my-blueprint 2. POST /api/v1/clusters/my-cluster
- 14. Blueprints for Large Scale • Kerberos, secure out-of-the-box • High Availability is setup initially for NameNode, YARN, Hive, Oozie, etc • Host Discovery allows Ambari to automatically install services for a Host when it comes online • Stack Advisor recommendations
- 15. POST /api/v1/clusters/MyCluster/hosts [ { "blueprint" : "single-node-hdfs-test2", "host_groups" :[ { "host_group" : "slave", "host_count" : 3, "host_predicate" : "Hosts/cpu_count>1” }, { "host_group" : "super-slave", "host_count" : 5, "host_predicate" : "Hosts/cpu_count>2& Hosts/total_mem>3000000" } ] } ] Blueprint Host Discovery
- 16. Kerberos Available since Ambari 2.0 • Ambari manages Kerberos principals and keytabs • Works with existing MIT KDC or Active Directory • Once Kerberized, handles • Adding hosts • Adding components to existing hosts • Adding services • Moving components to different hosts
- 17. Management Packs - Motivation • Release Management o Ambari core and stacks released together o Stack changes require Ambari release o Decouple stack and Ambari core releases • Add-on Services o Release vehicle for 3rd party services o Self contained release artifacts
- 18. Management Packs – Release Trains
- 19. Management Packs • Generalized release artifact for stacks, add-on services, views, etc • Decouples stack releases from Ambari core release • Tarballs with metadata for applicability and content • Stack is an overlay of multiple management packs
- 20. Overlay of Management Packs
- 21. Management Pack++ Short Term Goals (Ambari 2.4) • Retrofit in Stack Processing Framework • Enable 3rd party to ship add-on services • Command line support Long Term Goals (Future) • Management Pack Framework • Deliver Views • Rest API support
- 22. Role Based Access Control (RBAC) As Ambari & organizations grow, so do security needs Ambari integrates with external authentication systems & LDAP
- 23. RBAC Terms • Roles have permissions, e.g., add services to cluster • Roles are applied to Resources e.g., Ambari, particular Cluster, particular View • Users belong to groups • A group has a role • Users can also have additional roles
- 24. New RBAC Roles allAmbari Admin Cluster Admin except manage permissions Cluster Op except add services, Kerberos, manage Alerts, & upgrades Service Admin except alter cluster topology or install components Service Op except change configs Read-Only only view
- 25. Background: Upgrade Terminology Manual Upgrade The user follows instructions to upgrade the stack Incurs downtime
- 26. Background: Upgrade Terminology Manual Upgrade The user follows instructions to upgrade the stack Incurs downtime Rolling Upgrade Automated Upgrades one component per host at a time Preserves cluster operation and minimizes service impact
- 27. Background: Upgrade Terminology Express Upgrade Automated Runs in parallel across hosts Incurs downtime Manual Upgrade The user follows instructions to upgrade the stack Incurs downtime Rolling Upgrade Automated Upgrades one component per host at a time Preserves cluster operation and minimizes service impact
- 28. Automated Upgrade: Rolling or Express Check Prerequisites Review the prereqs to confirm your cluster configs are ready Prepare Take backups of critical cluster metadata Perform Upgrade Perform the HDP upgrade. The steps depend on upgrade method: Rolling or Express Register + Install Register the HDP repository and install the target HDP version on the cluster Finalize Finalize the upgrade, making the target version the current version
- 29. Process: Rolling Upgrade ZooKeeper Ranger Core Masters Core Slaves Hive Oozie Falcon Clients Kafka Knox Storm Slider Flume Finalize or Downgrade HDFS, YARN, MR, Tez, HBase, Pig. Hive, etc. HDFS YARN HBas e
- 30. Grafana for Ambari Metrics • Grafana as a “Native UI” for Ambari Metrics • Pre-built Dashboards Host-level, Service-level • Supports HTTPS • System Home, Servers • HDFS Home, NameNodes, DataNodes • YARN Home, Applications, Job History Server • HBase Home, Performance, Misc FEATURES DASHBOARDS
- 31. Grafana includes pre-built dashboards for visualizing the most important cluster metrics.
- 32. The HDFS NameNode dashboard highlights file system activity.
- 33. Future of Ambari • Cloud features • Multiple instances of same service at different versions, e.g., Spark 1.6 and Spark 2.0 • YARN assemblies • Component & Patch Upgrades: upgrade individual components in the same stack version, e.g., just DN and RM in HDP 2.4.*.* with zero downtime
Editor's Notes
- #5: Log Search : Solr, Logfeeder (similar to Logstash), and Grafana UI Zeppelin for data exploration and visualization that can plugin to multiple data backends Role Based Access Control
- #6: 2.3.0 was not used 2.4.0 is slated with a ton of new features Cadence is 2-3 major releases per year, with follow up maintenance releases in the months after.
- #7: Deploy: Blueprints with Host Discovery Secure: Kerberos, LDAP sync Smart Configs: stack advisor, painful to configure a thousand related knobs Monitor: Ambari Alerts, Ambari Metrics Upgrade: Rolling and Express Upgrade, get patches Analyze, Scale, Extend: Views, Management Packs
- #9: Cloudbreak can install on Amazon EC2, MSFT Azure, Cluster install takes 5-10 mins, mostly downloading packages, installing bits, and starting services.
- #10: Used by HDInsight (Microsoft Azure) and Hortonworks QA Allow cluster creation or scaling to be started via the REST API prior to all/any hosts being available. As hosts register with Ambari server they will be matched to request host groups and provisioned according to the requested topology Allow host predicates to be specified along with host count to provide more flexibility in matching hosts to host groups. This will allow for host flavors where different host groups are matched to different host flavors Break up the current monolithic provisioning request into a request for each host operation. For example, install on host A, start on host A, install on hostB, etc. This will allow hosts to make progress even when another host encounters a failure. Allow a host count to be specified in the cluster creation template instead of host names. This is documented in https://issues.apache.org/jira/browse/AMBARI-6275 Install a cluster with two API calls
- #11: The blueprint contains the configs, assignment of topology to host group, stack version The creation actually assigns hosts to each host group.
- #12: The blueprint contains the configs, assignment of topology to host group, stack version The creation actually assigns hosts to each host group.
- #13: The blueprint contains the configs, assignment of topology to host group, stack version The creation actually assigns hosts to each host group.
- #14: The blueprint contains the configs, assignment of topology to host group, stack version The creation actually assigns hosts to each host group.
- #15: Dynamic availability Allow host_count to be specified instead of host_names As hosts register, they will be matched to the request host groups and provisioned according to to the requested topology When specifying a host_count, a predicate can also be specified for finer-grained control
- #16: Dynamic availability Allow host_count to be specified instead of host_names As hosts register, they will be matched to the request host groups and provisioned according to to the requested topology When specifying a host_count, a predicate can also be specified for finer-grained control 3 Terabytes since units is in MB
- #23: As Ambari grows and organizations grow, so do security needs Users have fine-grained roles over the cluster and individual views. Granular authorization checks to distribute the responsibilities and privileges of authenticated users
- #26: Express Upgrade: fasted method to upgrade the stack since upgrades an entire component in batches of 100 hosts at a time Rolling Upgrade, one component at a time per host, which can take up to 1 min. For a 100 node cluster with
- #27: Express Upgrade: fasted method to upgrade the stack since upgrades an entire component in batches of 100 hosts at a time Rolling Upgrade, one component at a time per host, which can take up to 1 min. For a 100 node cluster with
- #28: Express Upgrade: fasted method to upgrade the stack since upgrades an entire component in batches of 100 hosts at a time Rolling Upgrade, one component at a time per host, which can take up to 1 min. For a 100 node cluster with
- #31: This Grafana instance is specifically for AMS, not meant to be general-purpose If customer is already using Grafana, this is not a replacement. Grafana will support read-only access for anonymous users, and HTTPS
- #34: 2 major themes.