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https://issues.apache.org/jira/browse/SOLR-7475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15020181#comment-15020181
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Dennis Gove commented on SOLR-7475:
-----------------------------------
The value is being returned by LukeRequestHandler.java. The pertinent function
is below
{code}
/** Returns the sum of RAM bytes used by each segment */
private static long getIndexHeapUsed(DirectoryReader reader) {
long indexHeapRamBytesUsed = 0;
for(LeafReaderContext leafReaderContext : reader.leaves()) {
LeafReader leafReader = leafReaderContext.reader();
if (leafReader instanceof SegmentReader) {
indexHeapRamBytesUsed += ((SegmentReader) leafReader).ramBytesUsed();
} else {
// Not supported for any reader that is not a SegmentReader
return -1;
}
}
return indexHeapRamBytesUsed;
}
{code}
This claims that returning the ram used is only supported by a SegmentReader
but that function is actually implemented in CodecReader and is declared in the
interface Accountable. I suspect this instanceof check can be changed to look
for the Accountable interface.
> Value of Heap Memory Usage display
> ----------------------------------
>
> Key: SOLR-7475
> URL: https://issues.apache.org/jira/browse/SOLR-7475
> Project: Solr
> Issue Type: Bug
> Components: UI, web gui
> Affects Versions: 5.0
> Environment: Windows 7 operating system, Solr-5.0, zookeeper-3.4.6
> Reporter: Yeo Zheng Lin
> Labels: memory, solr, ui
> Attachments: Heap Memory Usage.png
>
>
> In the Solr-5.0 admin UI, select a collection, click on Overview. This will
> show the statistics of the collection.
> For the Heap Memory Usage, it is showing the value -1 instead of the Heap
> Memory Usage for that collection. It was said to be working on the previous
> versions of Solr, and in version 5.0 it was showing -1.
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