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https://issues.apache.org/jira/browse/HBASE-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12603691#action_12603691
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stack commented on HBASE-674:
-----------------------------
For example:
{code}
public void testSizeCount() throws Exception {
HStoreKey hsk = new HStoreKey(new Text(getName()),
new Text(getName()), System.currentTimeMillis());
for (int i = 0; i < 3; i++) {
this.hmemcache.add(hsk, HStoreKey.getBytes(hsk));
}
this.hmemcache.snapshot();
System.out.println(this.hmemcache.getSnapshot().size());
}
{code}
The out.println in above says only one entry in the memcache though adding we
added 3 items to the memcache size.
Other issues here are that exceptions adding/deleting, etc., items can cause
count to be off. We add to stuff to the memcache size before successful add of
item.
> memcache size unreliable
> ------------------------
>
> Key: HBASE-674
> URL: https://issues.apache.org/jira/browse/HBASE-674
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.1.2
> Reporter: stack
> Priority: Blocker
> Fix For: 0.2.0
>
>
> Multiple updates against same row/column/ts will be seen as increments to
> cache size on insert but when we then play the memcache at flush time, we'll
> only see the most recent entry and decrement the memcache size by whatever
> its size; memcache will be off.
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