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https://issues.apache.org/jira/browse/HBASE-16890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15603988#comment-15603988
]
Duo Zhang commented on HBASE-16890:
-----------------------------------
{quote}
Next is to use onheap buffers instead of DBB because the checkSum calculation
API does not deal with DBB directly.
{quote}
Really? I think the native part is used to deal with DBB?
{code}
if (data.hasArray() && checksums.hasArray()) {
calculateChunkedSums(data.array(), data.arrayOffset() + data.position(),
data.remaining(),
checksums.array(), checksums.arrayOffset() + checksums.position());
return;
}
if (NativeCrc32.isAvailable()) {
NativeCrc32.calculateChunkedSums(bytesPerChecksum, type.id,
checksums, data);
return;
}
{code}
> Analyze the performance of AsyncWAL and fix the same
> ----------------------------------------------------
>
> Key: HBASE-16890
> URL: https://issues.apache.org/jira/browse/HBASE-16890
> Project: HBase
> Issue Type: Sub-task
> Components: wal
> Affects Versions: 2.0.0
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0
>
> Attachments: contention.png, contention_defaultWAL.png
>
>
> Tests reveal that AsyncWAL under load in single node cluster performs slower
> than the Default WAL. This task is to analyze and see if we could fix it.
> See some discussions in the tail of JIRA HBASE-15536.
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