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https://issues.apache.org/jira/browse/HBASE-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113569#comment-13113569
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Kannan Muthukkaruppan commented on HBASE-4434:
----------------------------------------------
Jonathan: Thanks for the review!
Unit tests ran fine, but for some completely unrelated/env related failures.
org.apache.hadoop.hbase.avro.TestAvroServer: Unresolved compilation problem:
testThreeRSAbort(org.apache.hadoop.hbase.master.TestDistributedLogSplitting):
test timed out after 300000 milliseconds
testOrphanLogCreation(org.apache.hadoop.hbase.master.TestDistributedLogSplitting):
test timed out after 300000 milliseconds
testStatusTemplateNoTables(org.apache.hadoop.hbase.master.TestMasterStatusServlet):
Unresolved compilation problems:
Can someone commit? (I will submit patch for HBASE-4433 after the commit since
that patch will update the TestBlocksRead again).
> Don't do HFile Scanner next() unless the next KV is needed:
> -----------------------------------------------------------
>
> Key: HBASE-4434
> URL: https://issues.apache.org/jira/browse/HBASE-4434
> Project: HBase
> Issue Type: Improvement
> Reporter: Kannan Muthukkaruppan
> Assignee: Kannan Muthukkaruppan
>
> When a seek/reseek is done on StoreFileScanner, in addition to setting the
> current KV, it also does a HFileScanner level next() ahead of time even if
> the next KV is never actually required. This inefficiency can potentially
> result in additional disk seeks and sub-optimal use of the block cache
> (primarily for cases where the KVs are large and each occupies an HFile block
> of its own).
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