[HBASE-25796] Batch version of checkAndMutate on AsyncTable always returns false

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 2.4.1
• Component/s: Client

Release Note

client:
   'org.apache.commons:commons-configuration2:2.7'
   'org.apache.hadoop:hadoop-hdfs:2.7.3'
   'org.apache.hbase:hbase-client:2.4.1'

server:
   hbase: 2.2.6

• Assignee: Unassigned
• Reporter: Hochul Shin
• Created: 20/Apr/21 23:10
• Updated: 22/Apr/21 06:29
• Resolved: 22/Apr/21 06:29

Description

Batch version of CheckAndMutate always returns false whereas non-batch version works fine. 

The code is like: 

```

AysncTable<?> table = connection.getTable(tableName, executorService);

...

// add r1

table.put(Arrays.asList(
new Put(Bytes.toBytes("r1")).addColumn(COL_FAMILY, Bytes.toBytes("q1"), Bytes.toBytes("v1"))));

CheckAndMutate checkAndMutate1 = CheckAndMutate.newBuilder(Bytes.toBytes("r1"))
.ifNotExists(COL_FAMILY, Bytes.toBytes("q1"))
.build(new Put(Bytes.toBytes("r1")).addColumn(COL_FAMILY, Bytes.toBytes("q1"), Bytes.toBytes("v1")));

CheckAndMutate checkAndMutate2 = CheckAndMutate.newBuilder(Bytes.toBytes("r2"))
.ifNotExists(COL_FAMILY, Bytes.toBytes("q2"))
.build(new Put(Bytes.toBytes("r2")).addColumn(COL_FAMILY, Bytes.toBytes("q2"), Bytes.toBytes("v2")));

```

With batch version of checkAndMutate

```

List<CompletableFuture<CheckAndMutateResult>> results =
   table.checkAndMutate(Arrays.asList(checkAndMutate1, checkAndMutate2));

System.out.println("first: " + results.get(0).join().isSuccess());  // false
System.out.println("second: " + results.get(1).join().isSuccess()); //false!

```

Even it returned false, the item was written to the table. 

 

With non-batch version of checkAndMutate

```

CompletableFuture<CheckAndMutateResult> result1 = table.checkAndMutate(checkAndMutate1);
CompletableFuture<CheckAndMutateResult> result2 = table.checkAndMutate(checkAndMutate2);

System.out.println("first: " + result1.join().isSuccess()); // false 
System.out.println("second: " + result2.join().isSuccess()); // true as expected

```

As expected r1 wasn't written to the table.