wangweiming800 commented on a change in pull request #741: PHOENIX-5791
Eliminate false invalid row detection due to concurrent …
URL: https://github.com/apache/phoenix/pull/741#discussion_r398344146
##########
File path:
phoenix-core/src/main/java/org/apache/phoenix/coprocessor/IndexRebuildRegionScanner.java
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@@ -613,39 +605,132 @@ private boolean isDeleteFamilyVersion(Mutation
mutation) {
}
return getMutationsWithSameTS(put, del);
}
+ /**
+ * In this method, the actual list is repaired in memory using the
expected list which is actually the output of
+ * rebuilding the index table row. The result of this repair is used only
for verification.
+ */
+ private void repairActualMutationList(List<Mutation> actualMutationList,
List<Mutation> expectedMutationList)
+ throws IOException {
+ // Find the first (latest) actual unverified put mutation
+ for (Mutation actual : actualMutationList) {
+ if (actual instanceof Put && !isVerified((Put) actual)) {
+ long ts = getTimestamp(actual);
+ int expectedIndex;
+ int expectedListSize = expectedMutationList.size();
+ for (expectedIndex = 0; expectedIndex < expectedListSize;
expectedIndex++) {
+ if (getTimestamp(expectedMutationList.get(expectedIndex))
<= ts) {
+ if (expectedIndex > 0) {
+ expectedIndex--;
+ }
+ break;
+ }
+ }
+ if (expectedIndex == expectedListSize) {
+ continue;
+ }
+ for (; expectedIndex < expectedListSize; expectedIndex++) {
+ Mutation mutation =
expectedMutationList.get(expectedIndex);
+ if (mutation instanceof Put) {
+ mutation = new Put((Put) mutation);
+ } else {
+ mutation = new Delete((Delete) mutation);
+ }
+ actualMutationList.add(mutation);
Review comment:
will it be a problem to modify the list when iterating it? I am not an
expert on Java, just a guess here.
https://stackoverflow.com/questions/6866238/concurrent-modification-exception-adding-to-an-arraylist
https://www.baeldung.com/java-concurrentmodificationexception
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