[ https://issues.apache.org/jira/browse/HBASE-9751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Hofhansl updated HBASE-9751: --------------------------------- Resolution: Fixed Hadoop Flags: Reviewed Status: Resolved (was: Patch Available) Committed to all branches. Thanks for the review Ted. Note that this is complementary to the scanner related stuff in HBASE-9753 and HBASE-9754. Here we use an HFile's metadata to avoid the MVCC altogether. > Excessive readpoints checks in StoreFileScanner > ------------------------------------------------ > > Key: HBASE-9751 > URL: https://issues.apache.org/jira/browse/HBASE-9751 > Project: HBase > Issue Type: Bug > Affects Versions: 0.98.0, 0.94.12, 0.96.0 > Reporter: Vladimir Rodionov > Assignee: Lars Hofhansl > Fix For: 0.98.0, 0.94.13, 0.96.1 > > Attachments: 9751-0.94.txt, 9751-0.94-v2.txt, 9751-trunk.txt, > 9751-trunk-v2.txt > > > 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. -- This message was sent by Atlassian JIRA (v6.1#6144)