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https://issues.apache.org/jira/browse/HBASE-20769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16523341#comment-16523341
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Zheng Hu commented on HBASE-20769:
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[~tianjingyun], The bug was introduced by HBASE-18090, Would you mind prepare
patch for branch-1.4 & branch-1.3 ? Thanks.
> getSplits() has a out of bounds problem in TableSnapshotInputFormatImpl
> -----------------------------------------------------------------------
>
> Key: HBASE-20769
> URL: https://issues.apache.org/jira/browse/HBASE-20769
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.3.0, 1.4.0, 2.0.0
> Reporter: Jingyun Tian
> Assignee: Jingyun Tian
> Priority: Major
> Fix For: 2.0.0
>
> Attachments: HBASE-20769.master.001.patch,
> HBASE-20769.master.002.patch, HBASE-20769.master.003.patch,
> HBASE-20769.master.004.patch
>
>
> When numSplits > 1, getSplits may create split that has start row smaller
> than user specified scan's start row or stop row larger than user specified
> scan's stop row.
> {code}
> byte[][] sp = sa.split(hri.getStartKey(), hri.getEndKey(), numSplits,
> true);
> for (int i = 0; i < sp.length - 1; i++) {
> if (PrivateCellUtil.overlappingKeys(scan.getStartRow(),
> scan.getStopRow(), sp[i],
> sp[i + 1])) {
> List<String> hosts =
> calculateLocationsForInputSplit(conf, htd, hri, tableDir,
> localityEnabled);
> Scan boundedScan = new Scan(scan);
> boundedScan.setStartRow(sp[i]);
> boundedScan.setStopRow(sp[i + 1]);
> splits.add(new InputSplit(htd, hri, hosts, boundedScan,
> restoreDir));
> }
> }
> {code}
> Since we split keys by the range of regions, when sp[i] < scan.getStartRow()
> or sp[i + 1] > scan.getStopRow(), the created bounded scan may contain range
> that over user defined scan.
> fix should be simple:
> {code}
> boundedScan.setStartRow(
> Bytes.compareTo(scan.getStartRow(), sp[i]) > 0 ? scan.getStartRow() : sp[i]);
> boundedScan.setStopRow(
> Bytes.compareTo(scan.getStopRow(), sp[i + 1]) < 0 ? scan.getStopRow() : sp[i
> + 1]);
> {code}
> I will also try to add UTs to help discover this problem
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