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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8452) Reduce byte copy in PrefixTreeSeeker
Date Sun, 28 Apr 2013 09:24:15 GMT
chunhui shen created HBASE-8452:
-----------------------------------

             Summary: Reduce byte copy in PrefixTreeSeeker
                 Key: HBASE-8452
                 URL: https://issues.apache.org/jira/browse/HBASE-8452
             Project: HBase
          Issue Type: Improvement
          Components: regionserver
    Affects Versions: 0.95.0
            Reporter: chunhui shen
            Assignee: chunhui shen


In PrefixTreeSeeker, I think we could do two improvement for deep copy of byte.

1.
{code}
PrefixTreeSeeker#getKeyValue(){
KeyValueUtil.copyToNewKeyValue(ptSearcher.current());
}
{code}
This method will be called frequently when reading. e.g. Scanner#peek(), Scanner comparison
in KeyValueHeap

2.
{code}
PrefixTreeSeeker#seekToOrBeforeUsingPositionAtOrBefore(){
KeyValue.createKeyValueFromKey(keyOnlyBytes, offset, length);
}
PrefixTreeSeeker#seekToOrBeforeUsingPositionAtOrAfter(){
KeyValue.createKeyValueFromKey(keyOnlyBytes, offset, length);
}
{code}


Solution:
1.Using a cache for seeker's current keyvalue. 
2.Importing new KeyOnlyCell class without coping bytes.



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