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Posted to dev@hbase.apache.org by "Vladimir Rodionov (JIRA)" <ji...@apache.org> on 2013/10/12 06:42:41 UTC

[jira] [Created] (HBASE-9751) Excessive readpoints checks in MemStoreScanner and StoreFileScanner

Vladimir Rodionov created HBASE-9751:
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             Summary: Excessive  readpoints checks in MemStoreScanner and StoreFileScanner
                 Key: HBASE-9751
                 URL: https://issues.apache.org/jira/browse/HBASE-9751
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.94.12, 0.98.0, 0.96.0
            Reporter: Vladimir Rodionov


It seems that usage of skipKVsNewerThanReadpoint in StoreFileScanner can be greatly reduced or even eliminated all together (HFiles are immutable and no new KVs can be inserted after scanner instance is created). The same is true for MemStoreScanner which checks readpoint on every next() and seek(). Each readpoint check is ThreadLocal.get() and it is quite expensive.  



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