Github user gokulavasan commented on a diff in the pull request: https://github.com/apache/incubator-tephra/pull/34#discussion_r100868455 --- Diff: tephra-hbase-compat-0.96/src/test/java/org/apache/tephra/hbase/txprune/InvalidListPruneTest.java --- @@ -341,6 +310,87 @@ public HTableInterface get() throws IOException { } } + @Test + public void testPruneEmptyTable() throws Exception { + // Make sure that empty tables do not block the progress of pruning + + // Create an empty table + TableName txEmptyTable = TableName.valueOf("emptyPruneTestTable"); + HTable emptyHTable = createTable(txEmptyTable.getName(), new byte[][]{family}, false, + Collections.singletonList(TestTransactionProcessor.class.getName())); + + TransactionPruningPlugin transactionPruningPlugin = new TestTransactionPruningPlugin(); + transactionPruningPlugin.initialize(conf); + + try { + long now1 = System.currentTimeMillis(); + long inactiveTxTimeNow1 = (now1 - 150) * TxConstants.MAX_TX_PER_MS; + long noPruneUpperBound = -1; + long expectedPruneUpperBound1 = (now1 - 200) * TxConstants.MAX_TX_PER_MS; + InMemoryTransactionStateCache.setTransactionSnapshot( + new TransactionSnapshot(expectedPruneUpperBound1, expectedPruneUpperBound1, expectedPruneUpperBound1, + ImmutableSet.of(expectedPruneUpperBound1), + ImmutableSortedMap.<Long, TransactionManager.InProgressTx>of())); + testUtil.compact(txEmptyTable, true); + testUtil.compact(txDataTable1, true); + // Since the write to prune table happens async, we need to sleep a bit before checking the state of the table + TimeUnit.SECONDS.sleep(2); + + // fetch prune upper bound, there should be no prune upper bound since txEmptyTable cannot be compacted + long pruneUpperBound1 = transactionPruningPlugin.fetchPruneUpperBound(now1, inactiveTxTimeNow1); + Assert.assertEquals(noPruneUpperBound, pruneUpperBound1); + transactionPruningPlugin.pruneComplete(now1, noPruneUpperBound); + + // Now flush the empty table, this will record the table region as empty, and then pruning will continue + testUtil.flush(txEmptyTable); + // Since the write to prune table happens async, we need to sleep a bit before checking the state of the table + TimeUnit.SECONDS.sleep(2); + + // fetch prune upper bound, again, this time it should work + pruneUpperBound1 = transactionPruningPlugin.fetchPruneUpperBound(now1, inactiveTxTimeNow1); + Assert.assertEquals(expectedPruneUpperBound1, pruneUpperBound1); + transactionPruningPlugin.pruneComplete(now1, expectedPruneUpperBound1); + + // Now add some data to the empty table + // (adding data non-transactionally is okay too, we just need some data for the compaction to run) + emptyHTable.put(new Put(Bytes.toBytes(1)).add(family, qualifier, Bytes.toBytes(1))); + emptyHTable.close(); + + // Now run another compaction on txDataTable1 with an updated tx snapshot + long now2 = System.currentTimeMillis(); + long inactiveTxTimeNow2 = (now2 - 150) * TxConstants.MAX_TX_PER_MS; + long expectedPruneUpperBound2 = (now2 - 200) * TxConstants.MAX_TX_PER_MS; + InMemoryTransactionStateCache.setTransactionSnapshot( + new TransactionSnapshot(expectedPruneUpperBound2, expectedPruneUpperBound2, expectedPruneUpperBound2, + ImmutableSet.of(expectedPruneUpperBound2), + ImmutableSortedMap.<Long, TransactionManager.InProgressTx>of())); + testUtil.flush(txEmptyTable); + testUtil.compact(txDataTable1, true); + // Since the write to prune table happens async, we need to sleep a bit before checking the state of the table + TimeUnit.SECONDS.sleep(2); + + // Running a prune now should still return min(inactiveTxTimeNow1, expectedPruneUpperBound1) since + // txEmptyTable is no longer empty. This information is returned since the txEmptyTable was recorded as being + // empty in the previous run with inactiveTxTimeNow1 + long pruneUpperBound2 = transactionPruningPlugin.fetchPruneUpperBound(now2, inactiveTxTimeNow2); + Assert.assertEquals(inactiveTxTimeNow1, pruneUpperBound2); + transactionPruningPlugin.pruneComplete(now2, expectedPruneUpperBound1); + + // However, after compacting txEmptyTable we should get the latest upper bound + testUtil.flush(txEmptyTable); + testUtil.compact(txEmptyTable, true); + // Since the write to prune table happens async, we need to sleep a bit before checking the state of the table + TimeUnit.SECONDS.sleep(2); + pruneUpperBound2 = transactionPruningPlugin.fetchPruneUpperBound(now2, inactiveTxTimeNow2); + Assert.assertEquals(expectedPruneUpperBound2, pruneUpperBound2); + transactionPruningPlugin.pruneComplete(now2, expectedPruneUpperBound2); + } finally { + transactionPruningPlugin.destroy(); + hBaseAdmin.disableTable(txEmptyTable); + hBaseAdmin.deleteTable(txEmptyTable); + } + } --- End diff -- Fix alignment
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