"Soft references" then. "Weak pointers" is an older term. (They're "weak" because some bully can steal their candy.)
On Sun, Oct 18, 2009 at 8:37 PM, Jason Rutherglen <[email protected]> wrote: > Lance, > > Do you mean soft references? > > On Sun, Oct 18, 2009 at 3:59 PM, Lance Norskog <[email protected]> wrote: >> -1 for weak references in caching. >> >> This makes memory management less deterministic (predictable) and at >> peak can cause cache-thrashing. In other words, the worst case gets >> even more worse. When designing a system I want predictability and I >> want to control the worst case, because system meltdowns are caused by >> the worst case. Having thousands of small weak references does the >> opposite. >> >> On Sat, Oct 17, 2009 at 2:00 AM, Noble Paul (JIRA) <[email protected]> wrote: >>> >>> [ >>> https://issues.apache.org/jira/browse/SOLR-1513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766864#action_12766864 >>> ] >>> >>> Noble Paul commented on SOLR-1513: >>> ---------------------------------- >>> >>> bq.Google Collections is already checked in as a dependency of Carrot >>> clustering. >>> >>> in that e need to move it to core. >>> >>> Jason . We do not need to remove the original option. We can probably add >>> an extra parameter say softRef="true" or something. That way , we are not >>> screwing up anything and perf benefits can be studied separately. >>> >>> >>>> Use Google Collections in ConcurrentLRUCache >>>> -------------------------------------------- >>>> >>>> Key: SOLR-1513 >>>> URL: https://issues.apache.org/jira/browse/SOLR-1513 >>>> Project: Solr >>>> Issue Type: Improvement >>>> Components: search >>>> Affects Versions: 1.4 >>>> Reporter: Jason Rutherglen >>>> Priority: Minor >>>> Fix For: 1.5 >>>> >>>> Attachments: google-collect-snapshot.jar, SOLR-1513.patch >>>> >>>> >>>> ConcurrentHashMap is used in ConcurrentLRUCache. The Google Colletions >>>> concurrent map implementation allows for soft values that are great for >>>> caches that potentially exceed the allocated heap. Though I suppose Solr >>>> caches usually don't use too much RAM? >>>> http://code.google.com/p/google-collections/ >>> >>> -- >>> This message is automatically generated by JIRA. >>> - >>> You can reply to this email to add a comment to the issue online. >>> >>> >> >> >> >> -- >> Lance Norskog >> [email protected] >> > -- Lance Norskog [email protected]
