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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16784) Make use of ExtendedCell#write(OutputStream os) for the default HFileWriter#append()
Date Thu, 06 Oct 2016 17:46:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15552641#comment-15552641
] 

Anoop Sam John commented on HBASE-16784:
----------------------------------------

{code}
int klength = KeyValueUtil.keyLength(cell);
    int vlength = cell.getValueLength();

    out.writeInt(klength);
    out.writeInt(vlength);
    CellUtil.writeFlatKey(cell, out);
    CellUtil.writeValue(out, cell, vlength);
    int size = klength + vlength + KeyValue.KEYVALUE_INFRASTRUCTURE_SIZE;
    // Write the additional tag into the stream
    if (encodingCtx.getHFileContext().isIncludesTags()) {
      int tagsLength = cell.getTagsLength();
      out.writeShort(tagsLength);
      if (tagsLength > 0) {
        CellUtil.writeTags(out, cell, tagsLength);
      }
      size += tagsLength + KeyValue.TAGS_LENGTH_SIZE;
    }
{code}
All these can be replaced with calling KVUtil#oswrite(final Cell cell, final OutputStream
out, final boolean withTags) and passing encodingCtx.getHFileContext().isIncludesTags() boolean.
Now this KVUtil method is not returning the #bytes written.  We can change that. The ExtendedCell
API do return that.  So this will avoid many length parsing.

> Make use of ExtendedCell#write(OutputStream os) for the default HFileWriter#append()
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-16784
>                 URL: https://issues.apache.org/jira/browse/HBASE-16784
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16784.patch
>
>
> Initially this I was thinking we need to add an interface to represent the fact that
the key is contiguous. But since Extendedcell is added encapsulating all the internal interfaces
and adds a write(OutputStream , boolean) and tries to exploit the fact that the Cell is in
KV serialized format. Hence we can make use of it in HFileWriter#append() code in case of
No encoding case.



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