On 9/22/2016 4:59 PM, Yago Riveiro wrote: > The Heap Memory Usage in the UI it's always -1. There is some way to > get the amount of heap that a core consumes?
In all the versions that I have looked at, up to 6.0, this number is either entirely too small or -1. Looking into the code, this info comes from the /admin/luke handler, and that handler gets it from Lucene. The -1 appears to come into play when the reader object is not the expected type, so I'm guessing that past changes in Lucene require changes in Solr that have not yet happened. Even if the code is fixed so the reader object(s) are calculated correctly, that won't be enough information for a true picture of core memory usage. In order for this number to be accurate, size information from other places, such as Lucene caches and Solr caches, must also be included. There might also be memory structures involved that I haven't even thought of. It is entirely possible that the code to gather all this information does not yet exist. In my opinion, the Heap Memory statistic should be removed until a time when it can be overhauled so that it is as accurate as possible. Can you open an issue in Jira? Thanks, Shawn
