[ 
https://issues.apache.org/jira/browse/SOLR-9284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858470#comment-15858470
 ] 

Mike Drob edited comment on SOLR-9284 at 2/8/17 8:17 PM:
---------------------------------------------------------

https://github.com/apache/lucene-solr/blob/5738c293f0c3f346b3e3e52c937183060d59cba1/solr/core/src/java/org/apache/solr/store/blockcache/BlockDirectoryCache.java#L53

{code}
    if (releaseBlocks) {
      keysToRelease = Collections.newSetFromMap(new 
ConcurrentHashMap<BlockCacheKey,Boolean>(1024, 0.75f, 512));
      blockCache.setOnRelease(new OnRelease() {
        
        @Override
        public void release(BlockCacheKey key) {
          keysToRelease.remove(key);
        }
      });
    }
{code}

If we're using the global block cache option and create multiple directories 
using the same factory, we will lose the release hook for the first directory. 
I think we can verify that by creating a server with multiple cores.

Edit: Filed SOLR-10104


was (Author: mdrob):
https://github.com/apache/lucene-solr/blob/5738c293f0c3f346b3e3e52c937183060d59cba1/solr/core/src/java/org/apache/solr/store/blockcache/BlockDirectoryCache.java#L53

{code}
    if (releaseBlocks) {
      keysToRelease = Collections.newSetFromMap(new 
ConcurrentHashMap<BlockCacheKey,Boolean>(1024, 0.75f, 512));
      blockCache.setOnRelease(new OnRelease() {
        
        @Override
        public void release(BlockCacheKey key) {
          keysToRelease.remove(key);
        }
      });
    }
{code}

If we're using the global block cache option and create multiple directories 
using the same factory, we will lose the release hook for the first directory. 
I think we can verify that by creating a server with multiple cores.

> The HDFS BlockDirectoryCache should not let it's keysToRelease or names maps 
> grow indefinitely.
> -----------------------------------------------------------------------------------------------
>
>                 Key: SOLR-9284
>                 URL: https://issues.apache.org/jira/browse/SOLR-9284
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: hdfs
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 6.4, master (7.0)
>
>         Attachments: SOLR-9284.patch, SOLR-9284.patch
>
>
> https://issues.apache.org/jira/browse/SOLR-9284



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