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https://issues.apache.org/jira/browse/STORM-876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990351#comment-14990351
]
ASF GitHub Bot commented on STORM-876:
--------------------------------------
Github user d2r commented on a diff in the pull request:
https://github.com/apache/storm/pull/845#discussion_r43935420
--- Diff: storm-core/src/clj/backtype/storm/daemon/nimbus.clj ---
@@ -15,14 +15,24 @@
;; limitations under the License.
(ns backtype.storm.daemon.nimbus
(:import [org.apache.thrift.server THsHaServer THsHaServer$Args])
+ (:import [backtype.storm.generated KeyNotFoundException])
+ (:import [backtype.storm.blobstore LocalFsBlobStore])
(:import [org.apache.thrift.protocol TBinaryProtocol
TBinaryProtocol$Factory])
(:import [org.apache.thrift.exception])
(:import [org.apache.thrift.transport TNonblockingServerTransport
TNonblockingServerSocket])
(:import [org.apache.commons.io FileUtils])
+ (:import [javax.security.auth Subject])
+ (:import [backtype.storm.security.auth NimbusPrincipal])
+ (:import [java.util ArrayList])
(:import [java.nio ByteBuffer]
[java.util Collections HashMap]
[backtype.storm.generated NimbusSummary])
- (:import [java.io FileNotFoundException File FileOutputStream])
+ (:import [java.util Iterator])
+ (:import [java.nio ByteBuffer]
+ [java.util Collections List HashMap])
+ (:import [backtype.storm.blobstore AtomicOutputStream BlobStore
BlobStoreAclHandler
+ ClientBlobStore InputStreamWithMeta KeyFilter SyncBlobs])
--- End diff --
Blobstore, ClientBlobStore unused?
> Dist Cache: Basic Functionality
> -------------------------------
>
> Key: STORM-876
> URL: https://issues.apache.org/jira/browse/STORM-876
> Project: Apache Storm
> Issue Type: Improvement
> Components: storm-core
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Attachments: DISTCACHE.md, DistributedCacheDesignDocument.pdf
>
>
> Basic functionality for the Dist Cache feature.
> As part of this a new API should be added to support uploading and
> downloading dist cache items. storm-core.ser, storm-conf.ser and storm.jar
> should be written into the blob store instead of residing locally. We need a
> default implementation of the blob store that does essentially what nimbus
> currently does and does not need anything extra. But having an HDFS backend
> too would be great for scalability and HA.
> The supervisor should provide a way to download and manage these blobs and
> provide a working directory for the worker process with symlinks to the
> blobs. It should also allow the blobs to be updated and switch the symlink
> atomically to point to the new blob once it is downloaded.
> All of this is already done by code internal to Yahoo! we are in the process
> of getting it ready to push back to open source shortly.
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