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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-5683) Support specifying storage type for per-application local dirs
Date Sun, 09 Oct 2016 07:54:20 GMT

     [ https://issues.apache.org/jira/browse/YARN-5683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated YARN-5683:
-----------------------------
    Target Version/s: 3.0.0-alpha2
       Fix Version/s:     (was: 3.0.0-alpha2)

> Support specifying storage type for per-application local dirs
> --------------------------------------------------------------
>
>                 Key: YARN-5683
>                 URL: https://issues.apache.org/jira/browse/YARN-5683
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: nodemanager
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Tao Yang
>            Assignee: Tao Yang
>         Attachments: YARN-5683-1.patch, flow_diagram_for_MapReduce.png
>
>
> h3.  Introduction
> * Some applications of various frameworks (Flink, Spark and MapReduce etc) using local
storage (checkpoint, shuffle etc) might require high IO performance. It's useful to allocate
local directories to high performance storage media for these applications on heterogeneous
clusters.
> * YARN does not distinguish different storage types and hence applications cannot selectively
use storage media with different performance characteristics. Adding awareness of storage
media can allow YARN to make better decisions about the placement of local directories.
> h3.  Approach
> * NodeManager will distinguish storage types for local directories.
> ** yarn.nodemanager.local-dirs and yarn.nodemanager.log-dirs configuration should allow
the cluster administrator to optionally specify the storage type for each local directories.
Example: [SSD]/disk1/nm-local-dir,/disk2/nm-local-dir,/disk3/nm-local-dir (equals to [SSD]/disk1/nm-local-dir,[DISK]/disk2/nm-local-dir,[DISK]/disk3/nm-local-dir)
> ** StorageType defines DISK/SSD storage types and takes DISK as the default storage type.

> ** StorageLocation separates storage type and directory path, used by LocalDirAllocator
to aware the types of local dirs, the default storage type is DISK.
> ** getLocalPathForWrite method of LocalDirAllcator will prefer to choose the local directory
of the specified storage type, and will fallback to not care storage type if the requirement
can not be satisfied.
> ** Support for container related local/log directories by ContainerLaunch. All application
frameworks can set the environment variables (LOCAL_STORAGE_TYPE and LOG_STORAGE_TYPE) to
specified the desired storage type of local/log directories.
> * Allow specified storage type for various frameworks (Take MapReduce as an example)
> ** Add new configurations should allow application administrator to optionally specify
the storage type of local/log directories. (MapReduce add configurations: mapreduce.job.local-storage-type
and mapreduce.job.log-storage-type)
> ** Support for container work directories. Set the environment variables includes LOCAL_STORAGE_TYPE
and LOG_STORAGE_TYPE according to configurations above for ContainerLaunchContext and ApplicationSubmissionContext.
(MapReduce should update YARNRunner and TaskAttemptImpl)
> ** Add storage type prefix for request path to support for other local directories of
frameworks (such as shuffle directories for MapReduce). (MapReduce should update YarnOutputFiles,
MROutputFiles and YarnChild to support for output/work directories)
> ** Flow diagram for MapReduce framework
> !flow_diagram_for_MapReduce.png!
> h3.  Further Discussion
> * The requirement of storage type for local/log directories may not be satisfied on heterogeneous
clusters. To achieve global optimum, scheduler should aware and manage disk resources. [YARN-2139|https://issues.apache.org/jira/browse/YARN-2139]
is close to that but seems not support multiple storage types, maybe we should do even more
to aware the storage type of disk resource?
> * Node labels or node constraints ([YARN-3409|https://issues.apache.org/jira/browse/YARN-3409])
can also make a higher chance to satisfy the requirement of specified storage type.
> * Fallback strategy still needs to be concerned. Certain applications might not work
well when the requirement of storage type is not satisfied. When none of desired storage type
disk are available, should container launching be failed? let AM handle?
> This feature has been used for half a year to meet the needs of some applications on
Alibaba search clusters.
> Please feel free to give your suggestions and opinions.



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