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https://issues.apache.org/jira/browse/STORM-876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990636#comment-14990636
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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_r43953169
--- Diff: storm-core/src/clj/backtype/storm/daemon/nimbus.clj ---
@@ -1103,21 +1230,39 @@
(.set_reset_log_level_timeout_epoch log-config (coerce/to-long
timeout))
(.unset_reset_log_level_timeout_epoch log-config))))
+(defmethod blob-sync-code :distributed [conf nimbus]
+ (if (not (is-leader nimbus :throw-exception false))
+ (let [storm-cluster-state (:storm-cluster-state nimbus)
+ nimbus-host-port-info (:nimbus-host-port-info nimbus)
+ blob-store-key-list (into [] (get-key-set-from-blob-store
(:blob-store nimbus)))
--- End diff --
It would be better to have a `nimbus/get-key-list-from-blob-store`
function, and have `nimbus/get-key-set-from-blob-store` make a list out of it,
rather than doing a list -> set -> list conversion.
> 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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