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From "Jonathan Lawlor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10060) Unsynchronized scanning
Date Wed, 08 Apr 2015 20:50:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485997#comment-14485997
] 

Jonathan Lawlor commented on HBASE-10060:
-----------------------------------------

Hey [~lhofhansl] is this one the same as HBASE-13082? Should we mark this one as a duplicate
of HBASE-13082?

> Unsynchronized scanning
> -----------------------
>
>                 Key: HBASE-10060
>                 URL: https://issues.apache.org/jira/browse/HBASE-10060
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Priority: Minor
>         Attachments: 10060-trunk-v2.txt, 10060-trunk.txt
>
>
> HBASE-10015 has some lengthy discussion. The solution there ended up replacing synchronized
with ReentrantLock, which - somewhat surprisingly - yielded a non-trivial improvement for
tall tables.
> The goal should be to avoid locking in StoreScanner at all. StoreScanner is only accessed
by a single thread *except* when we have a concurrent flush or a compaction, which is rare
(we'd acquire and release the lock millions of times per second, and compact/flush a few time
an hour at the most).



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