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https://issues.apache.org/jira/browse/STORM-876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14987824#comment-14987824
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ASF GitHub Bot commented on STORM-876:
--------------------------------------
Github user knusbaum commented on a diff in the pull request:
https://github.com/apache/storm/pull/845#discussion_r43787675
--- Diff: storm-core/src/clj/backtype/storm/daemon/nimbus.clj ---
@@ -346,53 +394,124 @@
[(.getNodeId slot) (.getPort slot)]
)))
+(defn- get-nimbus-subject []
+ (let [nimbus-subject (Subject.)
+ nimbus-principal (NimbusPrincipal.)
+ principals (.getPrincipals nimbus-subject)]
+ (.add principals nimbus-principal)
+ nimbus-subject))
+
+(defn- get-metadata-version [blob-store key subject]
+ (let [blob-meta (.getBlobMeta blob-store key subject)]
+ (.get_version blob-meta)))
+
+(defn get-key-list-from-blob-store [blob-store]
+ (let [key-iter (.listKeys blob-store (get-nimbus-subject))
+ keys (iterator-seq key-iter)]
+ (if (not-nil? keys)
+ (java.util.ArrayList. keys)
+ [])))
--- End diff --
Here in one place you're returning a java ArrayList, and in the other
you're returning a clojure vector.
> 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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