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https://issues.apache.org/jira/browse/HDFS-5304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790738#comment-13790738
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Colin Patrick McCabe commented on HDFS-5304:
--------------------------------------------
{code}
+ if (cachedLocs == null || cachedLocs.length == 0) {
+ this.cachedLocs = EMPTY_LOCS;
+ } else {
+ this.cachedLocs = cachedLocs;
+ }
{code}
Would advise not doing this, but just defaulting to EMPTY_LOCS rather than null.
+ 1 once that's addressed.
> Expose if a block replica is cached in getFileBlockLocations
> ------------------------------------------------------------
>
> Key: HDFS-5304
> URL: https://issues.apache.org/jira/browse/HDFS-5304
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: HDFS-4949
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hdfs-5304-1.patch, hdfs-5304-2.patch, hdfs-5304-3.patch
>
>
> We need to expose which replicas of a block are cached so applications can
> place their tasks for memory-locality.
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