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From joshelser <>
Subject [GitHub] accumulo pull request #260: ACCUMULO-4643 initial implementation
Date Tue, 30 May 2017 14:47:21 GMT
Github user joshelser commented on a diff in the pull request:
    --- Diff: server/tserver/src/main/java/org/apache/accumulo/tserver/tablet/
    @@ -715,47 +722,54 @@ Batch nextBatch(SortedKeyValueIterator<Key,Value> iter, Range
range, int num, Se
         long maxResultsSize = tableConfiguration.getAsBytes(Property.TABLE_SCAN_MAXMEM);
    -    if (columns.size() == 0) {
    -, LocalityGroupUtil.EMPTY_CF_SET, false);
    -    } else {
    -, LocalityGroupUtil.families(columns), true);
    -    }
         Key continueKey = null;
         boolean skipContinueKey = false;
         boolean endOfTabletReached = false;
    -    while (iter.hasTop()) {
    -      value = iter.getTopValue();
    -      key = iter.getTopKey();
    +    try {
    +      if (columns.size() == 0) {
    +, LocalityGroupUtil.EMPTY_CF_SET, false);
    --- End diff --
    If `seek` throws the `ScanYieldException` and there exists a Key in the data which is
the same as the startKey of the Range, I believe we would miss data.
    `skipContinueKey` is set to true (in the catch below), but when we're `seek()`'ing here,
we haven't yet consumed that top key. Thus, on a re-seek, we would skip past it.
    My hunch is that you need a two catch statements: one here that does not skip the continueKey
and the one below around the `while(hasTop)` (as-is).

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