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Map index entries are not deleted on migration #308

rjanz opened this issue Oct 14, 2012 · 2 comments


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commented Oct 14, 2012

when using SQLPredicate in the localKeySet method we noticed, that we get the same key on different nodes.

The problem seems to be, that keys that are migrated to different nodes remain in the index, although they are deleted from the local map on the source node (localKeySet without arguments is correct).

It happens on 2.1, 2.3 and 2.3.1 the only difference is, that 2.3.1 has a faster migration.

I have created a test case for that problem.


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commented Oct 14, 2012

The test case starts up 3 instances does a localKeySet with predicate on all instances, then starts
a new instance to force migrations. After the first migration, the number of local keys returned with and without predicate will diverge, as there are duplicates

import java.util.Collections; 
import java.util.Set; 
import java.util.TreeSet; 

import org.junit.After; 
import org.junit.AfterClass; 
import org.junit.Before; 
import org.junit.Test; 

import com.hazelcast.config.Config; 
import com.hazelcast.config.MapConfig; 
import com.hazelcast.config.MapIndexConfig; 
import com.hazelcast.core.Hazelcast; 
import com.hazelcast.core.HazelcastInstance; 
import com.hazelcast.core.IMap; 
import com.hazelcast.query.SqlPredicate; 

public class IndexMigrationTest { 
    static final int INSTANCE_COUNT = 4; 
    static final int DELAY_INSTANCES = 1; 
    static HazelcastInstance[] instances = new HazelcastInstance[INSTANCE_COUNT]; 

public static class TestIndexBean implements Serializable { 
    private static final long serialVersionUID = 1; 

    public int index = 10;       

    public void testIndexDuringMigration() throws Exception { 
        final Config config = new Config(); 
        final MapConfig mapConfig = new MapConfig(); 
        String mapName = "testIndex"; 
        MapIndexConfig mapIndexConfig = new MapIndexConfig(); 
        config.setMapConfigs(Collections.singletonMap(mapConfig.getName(), mapConfig)); 
        for (int i = 0; i < INSTANCE_COUNT - DELAY_INSTANCES; i++) { 
            instances[i] = Hazelcast.newHazelcastInstance(config); 
        HazelcastInstance hi0 = instances[0]; 
        IMap<String, TestIndexBean> map = hi0.getMap(mapName); 
        int total = 100; 
        // FILLUP 
        for (int i = 0; i < total; i++) { 
            TestIndexBean tIB = new TestIndexBean(); 
            String oKey = "TEST" + i; 
            map.put(oKey, tIB); 
        for (int l = 0; l < 10000; l++) { 
            int count = 0; 

            if (l == 3 && DELAY_INSTANCES == 1) { 
                instances[INSTANCE_COUNT - 1] = Hazelcast.newHazelcastInstance(config); 
            for (int i = 0; i < INSTANCE_COUNT; i++) { 
                if (instances[i] != null) { 
                    Set<Object> set = new TreeSet<Object>(); 
                    IMap<Object, Object> testMap = instances[i].getMap(mapName); 
                    // all beans are matched through this predicate 
                    set.addAll(testMap.localKeySet(new SqlPredicate("index=10"))); 
                    count += set.size(); 
                    // The value with predicate
                    // local keyset without constraint (the real value, local stats show the same value) 
                    System.out.print("  "); 
            if (count != total) { 
                System.out.println("Unexpected count " + count); 
            // asserting is not easy, temporarily the counts might be different due to ongoing migration 
            //Assert.assertEquals("localKeySet and localKeySet with Predicate must match ",total, count); 


    public static void tearDownAfterClass() throws Exception { 
        for (int i = 0; i < INSTANCE_COUNT; i++) { 
            if (instances[i] != null) 

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commented Dec 11, 2012

Merged into issue #359.

@mdogan mdogan closed this Dec 11, 2012

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