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https://issues.apache.org/jira/browse/HBASE-18879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Hu updated HBASE-18879:
-----------------------------
Summary: HBase FilterList cause KeyOnlyFilter not work (was: Hbase
FilterList cause KeyOnlyFilter not work)
> HBase FilterList cause KeyOnlyFilter not work
> ---------------------------------------------
>
> Key: HBASE-18879
> URL: https://issues.apache.org/jira/browse/HBASE-18879
> Project: HBase
> Issue Type: Sub-task
> Components: Filters
> Affects Versions: 1.2.4
> Environment: OS： Red Hat 4.4.7-11
> Hadoop: 2.6.4
> Hbase: 1.2.4
> Reporter: ZHA_Moonlight
> Attachments: HBASE-18879-HBASE-18410.v1.patch
>
>
> when use FilterList and KeyOnlyFilter together, if we put KeyOnlyFilter
> before FilterList, the KeyOnlyFilter may not work, means it will also grab
> the cell values:
> {code:java}
> List<Filter> filters = new ArrayList<Filter>();
> Filter filter1 = new SingleColumnValueFilter(Bytes.toBytes("cf"),
> Bytes.toBytes("column1"),
> CompareOp.EQUAL, Bytes.toBytes("value1"));
> Filter filter2 = new SingleColumnValueFilter(Bytes.toBytes("cf"),
> Bytes.toBytes("column1"),
> CompareOp.EQUAL, Bytes.toBytes("value2"));
> filters.add(filter1);
> filters.add(filter2);
> FilterList filterListAll = new FilterList(Operator.MUST_PASS_ALL,
> new KeyOnlyFilter(),
> new FilterList(Operator.MUST_PASS_ONE, filters));
> {code}
> use the above code as filter to scan a table, it will return the cells with
> value instead of only return the key, if we put KeyOnlyFilter after
> FilterList as following, it works well.
>
> {code:java}
> FilterList filterListAll = new FilterList(Operator.MUST_PASS_ALL,
> new FilterList(Operator.MUST_PASS_ONE, filters),
> new KeyOnlyFilter());
> {code}
> the cause should due to the following code at hbase-client FilterList.java
> {code:java}
> @Override
>
> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="SF_SWITCH_FALLTHROUGH",
> justification="Intentional")
> public ReturnCode filterKeyValue(Cell v) throws IOException {
> this.referenceKV = v;
> // Accumulates successive transformation of every filter that includes
> the Cell:
> Cell transformed = v;
> ReturnCode rc = operator == Operator.MUST_PASS_ONE?
> ReturnCode.SKIP: ReturnCode.INCLUDE;
> int listize = filters.size();
> for (int i = 0; i < listize; i++) {
> Filter filter = filters.get(i);
> if (operator == Operator.MUST_PASS_ALL) {
> if (filter.filterAllRemaining()) {
> return ReturnCode.NEXT_ROW;
> }
> LINE1 ReturnCode code = filter.filterKeyValue(v);{color}
> switch (code) {
> // Override INCLUDE and continue to evaluate.
> case INCLUDE_AND_NEXT_COL:
> rc = ReturnCode.INCLUDE_AND_NEXT_COL; // FindBugs
> SF_SWITCH_FALLTHROUGH
> case INCLUDE:
> LINE2 transformed = filter.transformCell(transformed);{color}
>
> continue;
> case SEEK_NEXT_USING_HINT:
> seekHintFilter = filter;
> return code;
> default:
> return code;
> }
> }
> {code}
> notice the “LINE1”,"LINE2" , first line is a recursive invocation, it will
> assign a Cell results to the FilterList.transformedKV(we call it A), the
> results is from the FilterList with 2 SingleColumnValueFilter, so A with
> contains the cell value, while the second line with return A to the var
> transformed.
> back to the following loop, we can see the FilterList return results is var
> "transformed " which will override in each loop, so the value is determined
> by the last filter, so the order of KeyOnlyFilter will impact the results.
> {code:java}
> Cell transformed = v;
> ReturnCode rc = operator == Operator.MUST_PASS_ONE?
> ReturnCode.SKIP: ReturnCode.INCLUDE;
> int listize = filters.size();
> for (int i = 0; i < listize; i++) {
> Filter filter = filters.get(i);
> if (operator == Operator.MUST_PASS_ALL) {
> if (filter.filterAllRemaining()) {
> return ReturnCode.NEXT_ROW;
> }
> ReturnCode code = filter.filterKeyValue(v);
> switch (code) {
> // Override INCLUDE and continue to evaluate.
> case INCLUDE_AND_NEXT_COL:
> rc = ReturnCode.INCLUDE_AND_NEXT_COL; // FindBugs
> SF_SWITCH_FALLTHROUGH
> case INCLUDE:
> transformed = filter.transformCell(transformed);
> continue;
> case SEEK_NEXT_USING_HINT:
> seekHintFilter = filter;
> return code;
> default:
> return code;
> }
>
> {code}
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