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https://issues.apache.org/jira/browse/HBASE-12583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14229713#comment-14229713
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rajeshbabu commented on HBASE-12583:
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[~anoop.hbase]
bq. The policy in this child region will also be same as that in parent? In
that case new getter in HRegion also not needed
Yes the policy for child regions also same as parent. But we doesn't have child
regions reference in storefilesplitter. Also the split policy is private member
in HRegion so we should have getter to access from any region.
bq. Can keep as protected?
It can be protected. I will update while committing.
Thanks.
> Allow creating reference files even the split row not lies in the storefile
> range if required
> ---------------------------------------------------------------------------------------------
>
> Key: HBASE-12583
> URL: https://issues.apache.org/jira/browse/HBASE-12583
> Project: HBase
> Issue Type: Improvement
> Reporter: rajeshbabu
> Assignee: rajeshbabu
> Labels: Phoenix
> Fix For: 2.0.0, 0.98.9, 0.99.2
>
> Attachments: HBASE-12583.patch, HBASE-12583_v2.patch
>
>
> Currently in HRegionFileSystem#splitStoreFile we are not creating reference
> files if the split row not lies in the storefile range that means one of the
> child region doesn't have any data.
> {code}
> // Check whether the split row lies in the range of the store file
> // If it is outside the range, return directly.
> if (top) {
> //check if larger than last key.
> KeyValue splitKey = KeyValueUtil.createFirstOnRow(splitRow);
> byte[] lastKey = f.createReader().getLastKey();
> // If lastKey is null means storefile is empty.
> if (lastKey == null) return null;
> if (f.getReader().getComparator().compareFlatKey(splitKey.getBuffer(),
> splitKey.getKeyOffset(), splitKey.getKeyLength(), lastKey, 0,
> lastKey.length) > 0) {
> return null;
> }
> } else {
> //check if smaller than first key
> KeyValue splitKey = KeyValueUtil.createLastOnRow(splitRow);
> byte[] firstKey = f.createReader().getFirstKey();
> // If firstKey is null means storefile is empty.
> if (firstKey == null) return null;
> if (f.getReader().getComparator().compareFlatKey(splitKey.getBuffer(),
> splitKey.getKeyOffset(), splitKey.getKeyLength(), firstKey, 0,
> firstKey.length) < 0) {
> return null;
> }
> }
> {code}
> In some cases when split row should be compared with part of rowkey(in
> composite rowkey) mainly for secondary index tables we need to create
> reference files even when split row not lies in the storefile range so that
> they can be rewritten to it's child regions by some custom half store file
> reader which compare the part of row key with split row.
> The check of comparing split row with storefile range and returning directly
> can be avoided by having special boolean attribute in table descriptor when
> it set to true. Or else we can have coprocessor hooks so that in the hooks we
> can create the references and bypass.
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