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https://issues.apache.org/jira/browse/HBASE-4081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066308#comment-13066308
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stack commented on HBASE-4081:
------------------------------
Your breakdown of the evolution of that section of cod sounds right to me Ming
Ma. Go for it.
> Issues with HRegion.compactStores methods
> -----------------------------------------
>
> Key: HBASE-4081
> URL: https://issues.apache.org/jira/browse/HBASE-4081
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Ming Ma
> Assignee: Ming Ma
> Attachments: HBASE-4081-trunk.patch
>
>
> HRegion.java,
> byte [] compactStores(final boolean majorCompaction)
> throws IOException {
> if (majorCompaction) {
> this.triggerMajorCompaction();
> }
> return compactStores();
> }
> /**
> * Compact all the stores and return the split key of the first store that
> needs
> * to be split.
> */
> public byte[] compactStores() throws IOException {
> for(Store s : getStores().values()) {
> CompactionRequest cr = s.requestCompaction();
> if(cr != null) {
> try {
> compact(cr);
> } finally {
> s.finishRequest(cr);
> }
> }
> byte[] splitRow = s.checkSplit();
> if (splitRow != null) {
> return splitRow;
> }
> }
> return null;
> }
> 1. It seems the second method's intention is to compact all the stores.
> However, if a store requires split, the process will stop.
> 2. Only MetaUtils, HRegion.merge, HRegion.processTable use these two methods.
> No caller uses the return value.
> 3. HRegion.merge expects major compaction for each store after the call and
> has code like below to check error condition.
> // Because we compacted the source regions we should have no more than
> two
> // HStoreFiles per family and there will be no reference store
> if (srcFiles.size() == 2)
> So it seems like the fixes are: a) take out s.CheckSplit() call inside
> compactStores. b) make the return type "void" for these two compactStores
> functions.
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