Package org.apache.hadoop.hbase

Class TestIOFencing

java.lang.Object

org.apache.hadoop.hbase.TestIOFencing

public class TestIOFencing
extends Object

Test for the case where a regionserver going down has enough cycles to do damage to regions that have actually been assigned elsehwere.

If we happen to assign a region before it fully done with in its old location -- i.e. it is on two servers at the same time -- all can work fine until the case where the region on the dying server decides to compact or otherwise change the region file set. The region in its new location will then get a surprise when it tries to do something w/ a file removed by the region in its old location on dying server.

Making a test for this case is a little tough in that even if a file is deleted up on the namenode, if the file was opened before the delete, it will continue to let reads happen until something changes the state of cached blocks in the dfsclient that was already open (a block from the deleted file is cleaned from the datanode by NN).

What we will do below is do an explicit check for existence on the files listed in the region that has had some files removed because of a compaction. This sort of hurry's along and makes certain what is a chance occurance.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	TestIOFencing.BlockCompactionsInCompletionHStore
static class	TestIOFencing.BlockCompactionsInCompletionRegion	An override of HRegion that allows us park compactions in a holding pattern and then when appropriate for the test, allow them proceed again.
static class	TestIOFencing.BlockCompactionsInPrepRegion	An override of HRegion that allows us park compactions in a holding pattern and then when appropriate for the test, allow them proceed again.
static class	TestIOFencing.CompactionBlockerRegion

Field Summary

Fields

Modifier and Type	Field	Description
static final HBaseClassTestRule	CLASS_RULE
private static final byte[]	FAMILY
private static final int	FIRST_BATCH_COUNT
private static final org.slf4j.Logger	LOG
private static final int	SECOND_BATCH_COUNT
private static final org.apache.hadoop.hbase.TableName	TABLE_NAME
private static final HBaseTestingUtil	TEST_UTIL

Constructor Summary

Constructors

Constructor	Description
TestIOFencing()

Method Summary

Modifier and Type	Method	Description
void	doTest(Class<?> regionClass, org.apache.hadoop.hbase.MemoryCompactionPolicy policy)
void	testFencingAroundCompaction()	Test that puts up a regionserver, starts a compaction on a loaded region but holds the compaction until after we have killed the server and the region has come up on a new regionserver altogether.
void	testFencingAroundCompactionAfterWALSync()	Test that puts up a regionserver, starts a compaction on a loaded region but holds the compaction completion until after we have killed the server and the region has come up on a new regionserver altogether.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

CLASS_RULE

public static final HBaseClassTestRule CLASS_RULE

LOG

private static final org.slf4j.Logger LOG

TEST_UTIL

private static final HBaseTestingUtil TEST_UTIL

TABLE_NAME

private static final org.apache.hadoop.hbase.TableName TABLE_NAME

FAMILY

private static final byte[] FAMILY

FIRST_BATCH_COUNT

private static final int FIRST_BATCH_COUNT

See Also:

• Constant Field Values

SECOND_BATCH_COUNT

private static final int SECOND_BATCH_COUNT

See Also:

• Constant Field Values

Constructor Details

TestIOFencing

public TestIOFencing()

Method Details

testFencingAroundCompaction

public void testFencingAroundCompaction()
                                 throws Exception

Test that puts up a regionserver, starts a compaction on a loaded region but holds the compaction until after we have killed the server and the region has come up on a new regionserver altogether. This fakes the double assignment case where region in one location changes the files out from underneath a region being served elsewhere.

Throws:

Exception

testFencingAroundCompactionAfterWALSync

public void testFencingAroundCompactionAfterWALSync()
                                             throws Exception

Test that puts up a regionserver, starts a compaction on a loaded region but holds the compaction completion until after we have killed the server and the region has come up on a new regionserver altogether. This fakes the double assignment case where region in one location changes the files out from underneath a region being served elsewhere.

Throws:

Exception

doTest

public void doTest(Class<?> regionClass,
 org.apache.hadoop.hbase.MemoryCompactionPolicy policy)
            throws Exception

Throws:

Exception