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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14940) Make our unsafe based ops more safe
Date Thu, 24 Dec 2015 17:05:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15071135#comment-15071135

Hudson commented on HBASE-14940:

FAILURE: Integrated in HBase-1.0 #1127 (See [https://builds.apache.org/job/HBase-1.0/1127/])
HBASE-14940 Make our unsafe based ops more safe. (anoopsamjohn: rev 86d4e2084d354f12d21f993464f88ec286a8a594)
* hbase-client/src/main/java/org/apache/hadoop/hbase/filter/FuzzyRowFilter.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/util/UnsafeAccess.java

> 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, 1.1.3, 0.98.17, 1.0.4
>         Attachments: HBASE-14940.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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