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Posted to issues@hbase.apache.org by "Enis Soztutar (JIRA)" <ji...@apache.org> on 2016/01/18 23:01:39 UTC
[jira] [Updated] (HBASE-14940) Make our unsafe based ops more safe
[ https://issues.apache.org/jira/browse/HBASE-14940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HBASE-14940:
----------------------------------
Fix Version/s: (was: 1.0.4)
1.0.3
> Make our unsafe based ops more safe
> -----------------------------------
>
> Key: HBASE-14940
> URL: https://issues.apache.org/jira/browse/HBASE-14940
> Project: HBase
> Issue Type: Bug
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0, 1.2.0, 1.3.0, 1.0.3, 1.1.3, 0.98.17
>
> Attachments: HBASE-14940.patch, HBASE-14940_addendum_0.98.patch, HBASE-14940_branch-1.patch, HBASE-14940_branch-1.patch, HBASE-14940_branch-1.patch, HBASE-14940_branch-1.patch, HBASE-14940_v2.patch
>
>
> Thanks for the nice findings [~ikeda]
> This jira solves 3 issues with Unsafe operations and ByteBufferUtils
> 1. We can do sun unsafe based reads and writes iff unsafe package is available and underlying platform is having unaligned-access capability. But we were missing the second check
> 2. Java NIO is doing a chunk based copy while doing Unsafe copyMemory. The max chunk size is 1 MB. This is done for "A limit is imposed to allow for safepoint polling during a large copy" as mentioned in comments in Bits.java. We are also going to do same way
> 3. In ByteBufferUtils, when Unsafe is not available and ByteBuffers are off heap, we were doing byte by byte operation (read/copy). We can avoid this and do better way.
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