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https://issues.apache.org/jira/browse/HBASE-14882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15695461#comment-15695461
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Anoop Sam John commented on HBASE-14882:
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#1 - Oh ya the state var name might have changed over the time.. Ya it is the
heap requirement for having a long state in KV. ie. seqId.. We called it
memstoreTS before.
#2 - the former write API is used while copying the cell data over the MSLAB.
There is no Q we have to avoid writing tags. we must consider tags always. The
latter write API used while writing to RPC/HFile. You know, we have Codecs to
include tags or not.. So this boolean.. Any way see a TODO there.. We have to
even avoid this boolean also.. I may start working on that soon. That is a
change needed in how we deal with tags serializing over wire.
> Provide a Put API that adds the provided family, qualifier, value without
> copying
> ---------------------------------------------------------------------------------
>
> Key: HBASE-14882
> URL: https://issues.apache.org/jira/browse/HBASE-14882
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 1.2.0
> Reporter: Jerry He
> Assignee: Xiang Li
> Fix For: 2.0.0
>
> Attachments: HBASE-14882.master.000.patch,
> HBASE-14882.master.001.patch, HBASE-14882.master.002.patch,
> HBASE-14882.master.003.patch
>
>
> In the Put API, we have addImmutable()
> {code}
> /**
> * See {@link #addColumn(byte[], byte[], byte[])}. This version expects
> * that the underlying arrays won't change. It's intended
> * for usage internal HBase to and for advanced client applications.
> */
> public Put addImmutable(byte [] family, byte [] qualifier, byte [] value)
> {code}
> But in the implementation, the family, qualifier and value are still being
> copied locally to create kv.
> Hopefully we should provide an API that truly uses immutable family,
> qualifier and value.
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