Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-19 Thread Balázs Bence Sári 

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Ship it!




Ship It!

- Balázs Bence Sári


On Sept. 16, 2016, 2:57 p.m., Attila Doroszlai wrote:
> 
> ---
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51906/
> ---
> 
> (Updated Sept. 16, 2016, 2:57 p.m.)
> 
> 
> Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, 
> and Sebastian Toader.
> 
> 
> Bugs: AMBARI-18349
> https://issues.apache.org/jira/browse/AMBARI-18349
> 
> 
> Repository: ambari
> 
> 
> Description
> ---
> 
> A. Add `role_command_order.json` to make sure name node, node manager, 
> resource manager are started before running Microsoft R service check
> B. Create `/user/RevoShare` on HDFS if necessary when starting services
> 
> 
> Diffs
> -
> 
>   
> ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
>  ba9c8fb 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/package/scripts/service_check.py
>  547476b 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
>  PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/51906/diff/
> 
> 
> Testing
> ---
> 
> A. Role command order
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify name node, node manager, resource manager, data node are started 
> before Microsoft R service check
>4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
> RESOURCEMANAGER-START are smaller than stage_id for 
> MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
> ```
> select request_id, stage_id, task_id, role, role_command from 
> host_role_command order by request_id, stage_id, task_id;
> ```
> B. RevoShare
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`
> 
> 
> Thanks,
> 
> Attila Doroszlai
> 
>

Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-19 Thread Sebastian Toader 

---
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/51906/#review149461
---


Ship it!




Ship It!

- Sebastian Toader


On Sept. 16, 2016, 4:57 p.m., Attila Doroszlai wrote:
> 
> ---
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51906/
> ---
> 
> (Updated Sept. 16, 2016, 4:57 p.m.)
> 
> 
> Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, 
> and Sebastian Toader.
> 
> 
> Bugs: AMBARI-18349
> https://issues.apache.org/jira/browse/AMBARI-18349
> 
> 
> Repository: ambari
> 
> 
> Description
> ---
> 
> A. Add `role_command_order.json` to make sure name node, node manager, 
> resource manager are started before running Microsoft R service check
> B. Create `/user/RevoShare` on HDFS if necessary when starting services
> 
> 
> Diffs
> -
> 
>   
> ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
>  ba9c8fb 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/package/scripts/service_check.py
>  547476b 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
>  PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/51906/diff/
> 
> 
> Testing
> ---
> 
> A. Role command order
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify name node, node manager, resource manager, data node are started 
> before Microsoft R service check
>4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
> RESOURCEMANAGER-START are smaller than stage_id for 
> MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
> ```
> select request_id, stage_id, task_id, role, role_command from 
> host_role_command order by request_id, stage_id, task_id;
> ```
> B. RevoShare
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`
> 
> 
> Thanks,
> 
> Attila Doroszlai
> 
>

Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-19 Thread Attila Doroszlai 


> On Sept. 16, 2016, 7:01 p.m., Sebastian Toader wrote:
> > ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py,
> >  line 188
> > 
> >
> > Why is this needed ? There is already a action="create_on_execute"

According to my tests, "create_on_execute" is enough in itself if webhdfs is 
enabled, but the "execute" step is necessary if it is disabled.


- Attila


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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/51906/#review149214
---


On Sept. 16, 2016, 4:57 p.m., Attila Doroszlai wrote:
> 
> ---
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51906/
> ---
> 
> (Updated Sept. 16, 2016, 4:57 p.m.)
> 
> 
> Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, 
> and Sebastian Toader.
> 
> 
> Bugs: AMBARI-18349
> https://issues.apache.org/jira/browse/AMBARI-18349
> 
> 
> Repository: ambari
> 
> 
> Description
> ---
> 
> A. Add `role_command_order.json` to make sure name node, node manager, 
> resource manager are started before running Microsoft R service check
> B. Create `/user/RevoShare` on HDFS if necessary when starting services
> 
> 
> Diffs
> -
> 
>   
> ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
>  ba9c8fb 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/package/scripts/service_check.py
>  547476b 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
>  PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/51906/diff/
> 
> 
> Testing
> ---
> 
> A. Role command order
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify name node, node manager, resource manager, data node are started 
> before Microsoft R service check
>4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
> RESOURCEMANAGER-START are smaller than stage_id for 
> MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
> ```
> select request_id, stage_id, task_id, role, role_command from 
> host_role_command order by request_id, stage_id, task_id;
> ```
> B. RevoShare
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`
> 
> 
> Thanks,
> 
> Attila Doroszlai
> 
>

Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-16 Thread Sebastian Toader 

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https://reviews.apache.org/r/51906/#review149214
---




ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
 (line 188)


Why is this needed ? There is already a action="create_on_execute"


- Sebastian Toader


On Sept. 16, 2016, 4:57 p.m., Attila Doroszlai wrote:
> 
> ---
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51906/
> ---
> 
> (Updated Sept. 16, 2016, 4:57 p.m.)
> 
> 
> Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, 
> and Sebastian Toader.
> 
> 
> Bugs: AMBARI-18349
> https://issues.apache.org/jira/browse/AMBARI-18349
> 
> 
> Repository: ambari
> 
> 
> Description
> ---
> 
> A. Add `role_command_order.json` to make sure name node, node manager, 
> resource manager are started before running Microsoft R service check
> B. Create `/user/RevoShare` on HDFS if necessary when starting services
> 
> 
> Diffs
> -
> 
>   
> ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
>  ba9c8fb 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/package/scripts/service_check.py
>  547476b 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
>  PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/51906/diff/
> 
> 
> Testing
> ---
> 
> A. Role command order
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify name node, node manager, resource manager, data node are started 
> before Microsoft R service check
>4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
> RESOURCEMANAGER-START are smaller than stage_id for 
> MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
> ```
> select request_id, stage_id, task_id, role, role_command from 
> host_role_command order by request_id, stage_id, task_id;
> ```
> B. RevoShare
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`
> 
> 
> Thanks,
> 
> Attila Doroszlai
> 
>

Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-16 Thread Attila Doroszlai 


> On Sept. 16, 2016, 9:14 a.m., Sebastian Toader wrote:
> > ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py,
> >  line 107
> > 
> >
> > We should not rely on the availability of NN as only HDFS has NN other 
> > DFS implementation don't.
> > 
> > I think it's safer to check if ```params.default_fs``` is defined as 
> > that tells wether there is a DFS available and how that can be referred to.
> > 
> > When testing this please ensure that you test with both webhdfs enables 
> > and disabled (see ```params.is_webhdfs_enabled```, dfs.webhdfs.enabled 
> > config property)

Thank you for the webhdfs hint.  According to my tests, "create_on_execute" is 
enough in itself if webhdfs is enabled, but the "execute" step is necessary if 
it is disabled.


- Attila


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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/51906/#review149175
---


On Sept. 16, 2016, 4:57 p.m., Attila Doroszlai wrote:
> 
> ---
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51906/
> ---
> 
> (Updated Sept. 16, 2016, 4:57 p.m.)
> 
> 
> Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, 
> and Sebastian Toader.
> 
> 
> Bugs: AMBARI-18349
> https://issues.apache.org/jira/browse/AMBARI-18349
> 
> 
> Repository: ambari
> 
> 
> Description
> ---
> 
> A. Add `role_command_order.json` to make sure name node, node manager, 
> resource manager are started before running Microsoft R service check
> B. Create `/user/RevoShare` on HDFS if necessary when starting services
> 
> 
> Diffs
> -
> 
>   
> ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
>  ba9c8fb 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/package/scripts/service_check.py
>  547476b 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
>  PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/51906/diff/
> 
> 
> Testing
> ---
> 
> A. Role command order
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify name node, node manager, resource manager, data node are started 
> before Microsoft R service check
>4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
> RESOURCEMANAGER-START are smaller than stage_id for 
> MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
> ```
> select request_id, stage_id, task_id, role, role_command from 
> host_role_command order by request_id, stage_id, task_id;
> ```
> B. RevoShare
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`
> 
> 
> Thanks,
> 
> Attila Doroszlai
> 
>

Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-16 Thread Attila Doroszlai 

---
This is an automatically generated e-mail. To reply, visit:
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---

(Updated Sept. 16, 2016, 4:57 p.m.)


Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, and 
Sebastian Toader.


Changes
---

* Extracted dir creation to a separate method
 * Replaced `has_namenode` condition with `default_fs` check
 * Add `"execute"` call (needed for the case when WebHDFS is disabled)
 * Also added `"execute"` call to `service_check.py`


Bugs: AMBARI-18349
https://issues.apache.org/jira/browse/AMBARI-18349


Repository: ambari


Description
---

A. Add `role_command_order.json` to make sure name node, node manager, resource 
manager are started before running Microsoft R service check
B. Create `/user/RevoShare` on HDFS if necessary when starting services


Diffs (updated)
-

  
ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
 ba9c8fb 
  
contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/package/scripts/service_check.py
 547476b 
  
contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
 PRE-CREATION 

Diff: https://reviews.apache.org/r/51906/diff/


Testing
---

A. Role command order
   1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
   2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
   3. Verify name node, node manager, resource manager, data node are started 
before Microsoft R service check
   4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
RESOURCEMANAGER-START are smaller than stage_id for 
MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
```
select request_id, stage_id, task_id, role, role_command from host_role_command 
order by request_id, stage_id, task_id;
```
B. RevoShare
   1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
   2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
   3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`


Thanks,

Attila Doroszlai

Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-16 Thread Sebastian Toader 

---
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/51906/#review149175
---




ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
 (line 107)


We should not rely on the availability of NN as only HDFS has NN other DFS 
implementation don't.

I think it's safer to check if ```params.default_fs``` is defined as that 
tells wether there is a DFS available and how that can be referred to.

When testing this please ensure that you test with both webhdfs enables and 
disabled (see ```params.is_webhdfs_enabled```, dfs.webhdfs.enabled config 
property)



ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
 (lines 107 - 116)


Factor this out into a separate method


- Sebastian Toader


On Sept. 15, 2016, 1:45 p.m., Attila Doroszlai wrote:
> 
> ---
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51906/
> ---
> 
> (Updated Sept. 15, 2016, 1:45 p.m.)
> 
> 
> Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, 
> and Sebastian Toader.
> 
> 
> Bugs: AMBARI-18349
> https://issues.apache.org/jira/browse/AMBARI-18349
> 
> 
> Repository: ambari
> 
> 
> Description
> ---
> 
> A. Add `role_command_order.json` to make sure name node, node manager, 
> resource manager are started before running Microsoft R service check
> B. Create `/user/RevoShare` on HDFS if necessary when starting services
> 
> 
> Diffs
> -
> 
>   
> ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
>  ba9c8fb 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
>  PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/51906/diff/
> 
> 
> Testing
> ---
> 
> A. Role command order
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify name node, node manager, resource manager, data node are started 
> before Microsoft R service check
>4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
> RESOURCEMANAGER-START are smaller than stage_id for 
> MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
> ```
> select request_id, stage_id, task_id, role, role_command from 
> host_role_command order by request_id, stage_id, task_id;
> ```
> B. RevoShare
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`
> 
> 
> Thanks,
> 
> Attila Doroszlai
> 
>

Re: Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-15 Thread Balázs Bence Sári 

---
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/51906/#review149052
---




ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
 (line 107)


Do we need the has_namenode condition?


- Balázs Bence Sári


On Sept. 15, 2016, 11:45 a.m., Attila Doroszlai wrote:
> 
> ---
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/51906/
> ---
> 
> (Updated Sept. 15, 2016, 11:45 a.m.)
> 
> 
> Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, 
> and Sebastian Toader.
> 
> 
> Bugs: AMBARI-18349
> https://issues.apache.org/jira/browse/AMBARI-18349
> 
> 
> Repository: ambari
> 
> 
> Description
> ---
> 
> A. Add `role_command_order.json` to make sure name node, node manager, 
> resource manager are started before running Microsoft R service check
> B. Create `/user/RevoShare` on HDFS if necessary when starting services
> 
> 
> Diffs
> -
> 
>   
> ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
>  ba9c8fb 
>   
> contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
>  PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/51906/diff/
> 
> 
> Testing
> ---
> 
> A. Role command order
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify name node, node manager, resource manager, data node are started 
> before Microsoft R service check
>4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
> RESOURCEMANAGER-START are smaller than stage_id for 
> MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
> ```
> select request_id, stage_id, task_id, role, role_command from 
> host_role_command order by request_id, stage_id, task_id;
> ```
> B. RevoShare
>1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
>2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
>3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`
> 
> 
> Thanks,
> 
> Attila Doroszlai
> 
>

Review Request 51906: AMBARI-18349 Specify role command order to make Microsoft-R service check run after YARN is started

2016-09-15 Thread Attila Doroszlai 

---
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/51906/
---

Review request for Ambari, Balázs Bence Sári, Jayush Luniya, Sumit Mohanty, and 
Sebastian Toader.


Bugs: AMBARI-18349
https://issues.apache.org/jira/browse/AMBARI-18349


Repository: ambari


Description
---

A. Add `role_command_order.json` to make sure name node, node manager, resource 
manager are started before running Microsoft R service check
B. Create `/user/RevoShare` on HDFS if necessary when starting services


Diffs
-

  
ambari-server/src/main/resources/stacks/HDP/2.0.6/hooks/before-START/scripts/shared_initialization.py
 ba9c8fb 
  
contrib/management-packs/microsoft-r_mpack/src/main/resources/common-services/MICROSOFT_R/8.0.0/role_command_order.json
 PRE-CREATION 

Diff: https://reviews.apache.org/r/51906/diff/


Testing
---

A. Role command order
   1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
   2. Create cluster via web UI with HDFS, YARN, ZooKeeper, Microsoft R
   3. Verify name node, node manager, resource manager, data node are started 
before Microsoft R service check
   4. Verify stage_id for NAMENODE-START, NODEMANAGER-START, 
RESOURCEMANAGER-START are smaller than stage_id for 
MICROSOFT_R_SERVICE_CHECK-SERVICE_CHECK:
```
select request_id, stage_id, task_id, role, role_command from host_role_command 
order by request_id, stage_id, task_id;
```
B. RevoShare
   1. Install Ambari (trunk), add Microsoft R mpack, start Ambari
   2. Create cluster via blueprint with HDFS, YARN, ZooKeeper, Microsoft R
   3. Verify `/user/RevoShare` directory exists: `hdfs dfs -ls /user/`


Thanks,

Attila Doroszlai