[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Karthik Kambatla updated YARN-3405:
---
Issue Type: Bug (was: Sub-task)
Parent: (was: YARN-4752)
> FairScheduler's preemption cannot happen between sibling in some case
> -
>
> Key: YARN-3405
> URL: https://issues.apache.org/jira/browse/YARN-3405
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
>Affects Versions: 2.7.0
>Reporter: Peng Zhang
>Assignee: Peng Zhang
>Priority: Critical
> Labels: fs-preemption-bugs
> Attachments: YARN-3405.01.patch, YARN-3405.02.patch
>
>
> Queue hierarchy described as below:
> {noformat}
> root
>/ \
>queue-1 queue-2
> / \
> queue-1-1 queue-1-2
> {noformat}
> Assume cluster resource is 100
> # queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
> # When queue-1-2 is active, and it cause some new preemption request for
> fairshare 25.
> # When preemption from root, it has possibility to find preemption candidate
> is queue-2. If so preemptContainerPreCheck for queue-2 return false because
> it's equal to its fairshare.
> # Finally queue-1-2 will be waiting for resource release form queue-1-1
> itself.
> What I expect here is that queue-1-2 preempt from queue-1-1.
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Karthik Kambatla updated YARN-3405:
---
Issue Type: Sub-task (was: Bug)
Parent: YARN-4752
> FairScheduler's preemption cannot happen between sibling in some case
> -
>
> Key: YARN-3405
> URL: https://issues.apache.org/jira/browse/YARN-3405
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: fairscheduler
>Affects Versions: 2.7.0
>Reporter: Peng Zhang
>Assignee: Peng Zhang
>Priority: Critical
> Labels: BB2015-05-TBR
> Attachments: YARN-3405.01.patch, YARN-3405.02.patch
>
>
> Queue hierarchy described as below:
> {noformat}
> root
>/ \
>queue-1 queue-2
> / \
> queue-1-1 queue-1-2
> {noformat}
> Assume cluster resource is 100
> # queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
> # When queue-1-2 is active, and it cause some new preemption request for
> fairshare 25.
> # When preemption from root, it has possibility to find preemption candidate
> is queue-2. If so preemptContainerPreCheck for queue-2 return false because
> it's equal to its fairshare.
> # Finally queue-1-2 will be waiting for resource release form queue-1-1
> itself.
> What I expect here is that queue-1-2 preempt from queue-1-1.
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Allen Wittenauer updated YARN-3405:
---
Labels: BB2015-05-TBR (was: )
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Assignee: Peng Zhang
Priority: Critical
Labels: BB2015-05-TBR
Attachments: YARN-3405.01.patch, YARN-3405.02.patch
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so preemptContainerPreCheck for queue-2 return false because
it's equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Attachment: YARN-3405.02.patch
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Assignee: Peng Zhang
Priority: Critical
Attachments: YARN-3405.01.patch, YARN-3405.02.patch
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so preemptContainerPreCheck for queue-2 return false because
it's equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Attachment: (was: YARN-3405.02.patch)
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Assignee: Peng Zhang
Priority: Critical
Attachments: YARN-3405.01.patch, YARN-3405.02.patch
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so preemptContainerPreCheck for queue-2 return false because
it's equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Attachment: YARN-3405.02.patch
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Assignee: Peng Zhang
Priority: Critical
Attachments: YARN-3405.01.patch, YARN-3405.02.patch
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so preemptContainerPreCheck for queue-2 return false because
it's equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Attachment: YARN-3405.01.patch
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Assignee: Peng Zhang
Priority: Critical
Attachments: YARN-3405.01.patch
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so preemptContainerPreCheck for queue-2 return false because
it's equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Description:
Queue hierarchy described as below:
{noformat}
root
|
queue-1
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
was:
Queue hierarchy described as below:
{noformat}
root
/
queue-1
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
|
queue-1
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Description:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate is
queue-2. If so preemptContainerPreCheck for queue-2 return false because it's
equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
was:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate is
queue-2. If so preemptContainerPreCheck for queue-2 return false because it's
equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1 queue-2
/ \
queue-1-1 queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so preemptContainerPreCheck for queue-2 return false because
it's equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
--
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(v6.3.4#6332)
[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Description:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate is
queue-2. If so preemptContainerPreCheck for queue-2 return false because it's
equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
was:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate is
queue-2. If so
#. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so preemptContainerPreCheck for queue-2 return false because
it's equal to its fairshare.
# Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
What I expect here is that queue-1-2 preempt from queue-1-1.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Description:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate is
queue-2. If so
#. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
was:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
Assume cluster resource is 100
# queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
# When queue-1-2 is active, and it cause some new preemption request for
fairshare 25.
# When preemption from root, it has possibility to find preemption candidate
is queue-2. If so
#. Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Description:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
was:
Queue hierarchy described as below:
{noformat}
root
| \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Description:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
was:
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
/ \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
--
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[jira] [Updated] (YARN-3405) FairScheduler's preemption cannot happen between sibling in some case
[
https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Peng Zhang updated YARN-3405:
-
Description:
Queue hierarchy described as below:
{noformat}
root
| \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
was:
Queue hierarchy described as below:
{noformat}
root
|
queue-1
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
FairScheduler's preemption cannot happen between sibling in some case
-
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
| \
queue-1queue-2
/ \
queue-1-1queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1
itself.
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