hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10060) Unsynchronized scanning
Date Thu, 09 Apr 2015 05:47:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-10060:
----------------------------------
    Resolution: Duplicate
        Status: Resolved  (was: Patch Available)

> 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).



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message