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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (PHOENIX-1027) Why position be reset in SkipScanFilter
Date Sat, 07 Jun 2014 07:41:01 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-1027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

James Taylor reopened PHOENIX-1027:
-----------------------------------


I see - can you repro this with a unit test? The skip scan does not maintain much state -
you just have to capture the row key before the error and the transition being done to repro
it. See SkipScanFilterTest.

> Why position be reset in SkipScanFilter
> ---------------------------------------
>
>                 Key: PHOENIX-1027
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-1027
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: jay wong
>
> the method in SkipScanFilter.java
> {code}
>  private int nextPosition(int i) {
>         while (i >= 0 && slots.get(i).get(position[i]).isSingleKey() &&
(position[i] = (position[i] + 1) % slots.get(i).size()) == 0) {
>             i--;
>         }
>         return i;
>     }
> {code}
> In a query case. position[] has two elements position[0] = 3, position[1] = 0. 
> and slots.get( i ).size() = 1. 
> after the mothod execute two element in position[] are all 0.
> then
> {code}
>  private boolean intersect(byte[] lowerInclusiveKey, byte[] upperExclusiveKey, List<List<KeyRange>>
newSlots) {
> ........
>  for (int i = 0; i <= lastSlot; i++) {
>             List<KeyRange> newRanges = slots.get(i).subList(lowerPosition[i], Math.min(position[i]
+ 1, slots.get(i).size()));
>             .....
>         }
>         return true;
>     }
> {code}
> lowerPosition[i] = 3, Math.min(position[i] + 1, 
> slots.get( i ).size()) = 0 as a result of position[i] = 0
> so:
> {code}
> java.lang.IndexOutOfBoundsException: end index (1) must not be less than start index
(3)
> at com.google.common.base.Preconditions.checkPositionIndexes(Preconditions.java:384)
> at com.google.common.collect.RegularImmutableList.subList(RegularImmutableList.java:118)
> at com.google.common.collect.RegularImmutableList.subList(RegularImmutableList.java:31)
> at org.apache.phoenix.filter.SkipScanFilter.intersect(SkipScanFilter.java:221)
> at org.apache.phoenix.filter.SkipScanFilter.hasIntersect(SkipScanFilter.java:121)
> at org.apache.phoenix.compile.ScanRanges.intersect(ScanRanges.java:251)
> at org.apache.phoenix.iterate.SkipRangeParallelIteratorRegionSplitter$1.apply(SkipRangeParallelIteratorRegionSplitter.java:84)
> at org.apache.phoenix.iterate.SkipRangeParallelIteratorRegionSplitter$1.apply(SkipRangeParallelIteratorRegionSplitter.java:65)
> at com.google.common.collect.Iterators$7.computeNext(Iterators.java:649)
> at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
> at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
> at com.google.common.collect.Lists.newArrayList(Lists.java:138)
> at com.google.common.collect.Lists.newArrayList(Lists.java:119)
> at org.apache.phoenix.iterate.SkipRangeParallelIteratorRegionSplitter.filterRegions(SkipRangeParallelIteratorRegionSplitter.java:93)
> at org.apache.phoenix.iterate.SkipRangeParallelIteratorRegionSplitter.getAllRegions(SkipRangeParallelIteratorRegionSplitter.java:54)
> at org.apache.phoenix.iterate.DefaultParallelIteratorRegionSplitter.getSplits(DefaultParallelIteratorRegionSplitter.java:244)
> at org.apache.phoenix.iterate.ParallelIterators.getSplits(ParallelIterators.java:205)
> at org.apache.phoenix.iterate.ParallelIterators.<init>(ParallelIterators.java:78)
> at org.apache.phoenix.execute.AggregatePlan.newIterator(AggregatePlan.java:162)
> at org.apache.phoenix.execute.BasicQueryPlan.iterator(BasicQueryPlan.java:144)
> at org.apache.phoenix.execute.BasicQueryPlan.iterator(BasicQueryPlan.java:125)
> at org.apache.phoenix.jdbc.PhoenixStatement.executeQuery(PhoenixStatement.java:202)
> at org.apache.phoenix.jdbc.PhoenixStatement.execute(PhoenixStatement.java:922)
> at sqlline.SqlLine$Commands.execute(SqlLine.java:3673)
> at sqlline.SqlLine$Commands.sql(SqlLine.java:3584)
> at sqlline.SqlLine.dispatch(SqlLine.java:821)
> at sqlline.SqlLine.begin(SqlLine.java:699)
> at sqlline.SqlLine.mainWithInputRedirection(SqlLine.java:441)
> at sqlline.SqlLine.main(SqlLine.java:424)
> {code}



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