[jira] [Resolved] (HBASE-17300) Concurrently calling checkAndPut with expected value as null returns true unexpectedly

["Andrew Purtell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-17300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Purtell resolved HBASE-17300.
------------------------------------
    Resolution: Cannot Reproduce

> Concurrently calling checkAndPut with expected value as null returns true unexpectedly
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-17300
>                 URL: https://issues.apache.org/jira/browse/HBASE-17300
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.23, 1.2.4
>            Reporter: Samarth Jain
>         Attachments: HBASE-17300.patch
>
>
> Attached is the test case. I have added some comments so hopefully the test makes sense. It actually is causing test failures on the Phoenix branches.
> The test fails consistently using HBase-0.98.23. It exhibits flappy behavior with the 1.2 branch (failed twice in 5 tries). 
> {code}
> @Test
>     public void testNullCheckAndPut() throws Exception {
>             try (HBaseAdmin admin = TEST_UTIL.getHBaseAdmin()) {
>                 Callable<Boolean> c1 = new CheckAndPutCallable();
>                 Callable<Boolean> c2 = new CheckAndPutCallable();
>                 ExecutorService e = Executors.newFixedThreadPool(5);
>                 Future<Boolean> f1 = e.submit(c1);
>                 Future<Boolean> f2 = e.submit(c2);
>                 assertTrue(f1.get() || f2.get());
>                 assertFalse(f1.get() && f2.get());
>             }    
>         }
>     }
>     
>     
>     private static final class CheckAndPutCallable implements Callable<Boolean> {
>         @Override
>         public Boolean call() throws Exception {
>             byte[] rowToLock = "ROW".getBytes();
>             byte[] colFamily = "COLUMN_FAMILY".getBytes();
>             byte[] column = "COLUMN".getBytes();
>             byte[] newValue = "NEW_VALUE".getBytes();
>             byte[] oldValue = "OLD_VALUE".getBytes();
>             byte[] tableName = "table".getBytes();
>             boolean acquired = false;
>                 try (HBaseAdmin admin = TEST_UTIL.getHBaseAdmin()) {
>                     HTableDescriptor tableDesc = new HTableDescriptor(TableName.valueOf(tableName));
>                     HColumnDescriptor columnDesc = new HColumnDescriptor(colFamily);
>                     columnDesc.setTimeToLive(600);
>                     tableDesc.addFamily(columnDesc);
>                     try {
>                         admin.createTable(tableDesc);
>                     } catch (TableExistsException e) {
>                         // ignore
>                     }
>                     try (HTableInterface table = admin.getConnection().getTable(tableName)) {
>                         Put put = new Put(rowToLock);
>                         put.add(colFamily, column, oldValue); // add a row with column set to oldValue
>                         table.put(put);
>                         put = new Put(rowToLock);
>                         put.add(colFamily, column, newValue);
>                         // only one of the threads should be able to get return value of true for the expected value of oldValue
>                         acquired = table.checkAndPut(rowToLock, colFamily, column, oldValue, put); 
>                         if (!acquired) {
>                            // if a thread didn't get true before, then it shouldn't get true this time either
>                            // because the column DOES exist
>                            acquired = table.checkAndPut(rowToLock, colFamily, column, null, put);
>                         }
>                     }
>                 }
>             }  
>             return acquired;
>         }
>     }
> {code}
> cc [~apurtell], [~jamestaylor], [~lhofhansl]. 



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