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From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17872) Make BBU#copyFromBufferToBuffer thread-safe
Date Tue, 04 Apr 2017 12:19:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955066#comment-15955066
] 

Chia-Ping Tsai commented on HBASE-17872:
----------------------------------------

bq. +1 to fix it via BB.duplicate() call.
Okay, copy that. I will attach the patch after my local tests.

> Make BBU#copyFromBufferToBuffer thread-safe
> -------------------------------------------
>
>                 Key: HBASE-17872
>                 URL: https://issues.apache.org/jira/browse/HBASE-17872
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Chia-Ping Tsai
>            Assignee: Chia-Ping Tsai
>            Priority: Critical
>             Fix For: 2.0.0
>
>
> A case is shown below.
> We will get the wrong position of buffer in multithreaded environment, so the method
makes the invalid cell in MSLAB.
> {noformat}
>   public static int copyFromBufferToBuffer(ByteBuffer in, ByteBuffer out, int sourceOffset,
>       int destinationOffset, int length) {
>     if (in.hasArray() && out.hasArray()) {
>       // ...
>     } else if (UNSAFE_AVAIL) {
>       // ...
>     } else {
>       int outOldPos = out.position();
>       out.position(destinationOffset);
>       ByteBuffer inDup = in.duplicate();
>       inDup.position(sourceOffset).limit(sourceOffset + length);
>       out.put(inDup);
>       out.position(outOldPos);
>     }
>     return destinationOffset + length;
>   }
> {noformat}



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