[
https://issues.apache.org/jira/browse/HBASE-9769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803178#comment-13803178
]
Vladimir Rodionov commented on HBASE-9769:
------------------------------------------
I just checked trunk AbstractScannerV2. The code of HBase-5987 is there:
{code}
@Override
public int reseekTo(byte[] key, int offset, int length) throws IOException {
int compared;
if (isSeeked()) {
ByteBuffer bb = getKey();
compared = reader.getComparator().compare(key, offset,
length, bb.array(), bb.arrayOffset(), bb.limit());
if (compared < 1) {
// If the required key is less than or equal to current key, then
// don't do anything.
return compared;
} else {
if (this.nextIndexedKey != null &&
(this.nextIndexedKey == HConstants.NO_NEXT_INDEXED_KEY ||
reader.getComparator().compare(key, offset, length,
nextIndexedKey, 0, nextIndexedKey.length) < 0)) {
// The reader shall continue to scan the current data block instead
of querying the
// block index as long as it knows the target key is strictly
smaller than
// the next indexed key or the current data block is the last data
block.
return loadBlockAndSeekToKey(this.block, this.nextIndexedKey,
false, key, offset, length, false);
}
}
}
// Don't rewind on a reseek operation, because reseek implies that we are
// always going forward in the file.
return seekTo(key, offset, length, false);
}
{code}
but it seems that *nextIndexedKey* is never initialized properly. I did not
manage to find the place where the next block first key is assigned to this
variable.
> Improve performance of a Scanner with explicit column list when rows are
> small/medium size
> ------------------------------------------------------------------------------------------
>
> Key: HBASE-9769
> URL: https://issues.apache.org/jira/browse/HBASE-9769
> Project: HBase
> Issue Type: Improvement
> Components: Scanners
> Affects Versions: 0.98.0, 0.94.12, 0.96.0
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Attachments: 9769-0.94-sample1.txt, 9769-0.94-sample2.txt,
> 9769-0.94-sample.txt, 9769-94.txt, 9769-94-v2.txt, 9769-trunk-v1.txt,
> 9769-trunk-v2.txt, 9769-trunk-v3.txt, 9769-trunk-v4.txt
>
>
--
This message was sent by Atlassian JIRA
(v6.1#6144)
