Zhihong Yu created HBASE-6032:
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Summary: Port HFileBlockIndex improvement from HBASE-5987
Key: HBASE-6032
URL: https://issues.apache.org/jira/browse/HBASE-6032
Project: HBase
Issue Type: Task
Reporter: Zhihong Yu
Excerpt from HBASE-5987:
First, we propose to lookahead for one more block index so that the
HFileScanner would know the start key value of next data block. So if the
target key value for the scan(reSeekTo) is "smaller" than that start kv of next
data block, it means the target key value has a very high possibility in the
current data block (if not in current data block, then the start kv of next
data block should be returned. +Indexing on the start key has some defects
here+) and it shall NOT query the HFileBlockIndex in this case. On the
contrary, if the target key value is "bigger", then it shall query the
HFileBlockIndex. This improvement shall help to reduce the hotness of
HFileBlockIndex and avoid some unnecessary IdLock Contention or Index Block
Cache lookup.
This JIRA is to port the fix to HBase trunk, etc.
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