HDFS-3810. Implement format() for BKJM. Contributed by Ivan Kelly.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1407182 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uma Maheswara Rao G 2012-11-08 17:45:46 +00:00
parent 8a1f333707
commit f1fe91ec95
6 changed files with 232 additions and 67 deletions

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@ -560,6 +560,8 @@ Release 2.0.3-alpha - Unreleased
HDFS-3979. For hsync, datanode should wait for the local sync to complete
before sending ack. (Lars Hofhansl via szetszwo)
HDFS-3810. Implement format() for BKJM (Ivan Kelly via umamahesh)
Release 2.0.2-alpha - 2012-09-07
INCOMPATIBLE CHANGES

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@ -39,6 +39,7 @@
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.AsyncCallback.StringCallback;
import org.apache.zookeeper.ZKUtil;
import java.util.Collection;
import java.util.Collections;
@ -46,6 +47,7 @@
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.io.IOException;
import java.net.URI;
@ -142,13 +144,16 @@ public class BookKeeperJournalManager implements JournalManager {
private final Configuration conf;
private final BookKeeper bkc;
private final CurrentInprogress ci;
private final String basePath;
private final String ledgerPath;
private final String versionPath;
private final MaxTxId maxTxId;
private final int ensembleSize;
private final int quorumSize;
private final String digestpw;
private final CountDownLatch zkConnectLatch;
private final NamespaceInfo nsInfo;
private boolean initialized = false;
private LedgerHandle currentLedger = null;
/**
@ -160,16 +165,16 @@ public BookKeeperJournalManager(Configuration conf, URI uri,
this.nsInfo = nsInfo;
String zkConnect = uri.getAuthority().replace(";", ",");
String zkPath = uri.getPath();
basePath = uri.getPath();
ensembleSize = conf.getInt(BKJM_BOOKKEEPER_ENSEMBLE_SIZE,
BKJM_BOOKKEEPER_ENSEMBLE_SIZE_DEFAULT);
quorumSize = conf.getInt(BKJM_BOOKKEEPER_QUORUM_SIZE,
BKJM_BOOKKEEPER_QUORUM_SIZE_DEFAULT);
ledgerPath = zkPath + "/ledgers";
String maxTxIdPath = zkPath + "/maxtxid";
String currentInprogressNodePath = zkPath + "/CurrentInprogress";
String versionPath = zkPath + "/version";
ledgerPath = basePath + "/ledgers";
String maxTxIdPath = basePath + "/maxtxid";
String currentInprogressNodePath = basePath + "/CurrentInprogress";
versionPath = basePath + "/version";
digestpw = conf.get(BKJM_BOOKKEEPER_DIGEST_PW,
BKJM_BOOKKEEPER_DIGEST_PW_DEFAULT);
@ -180,47 +185,7 @@ public BookKeeperJournalManager(Configuration conf, URI uri,
if (!zkConnectLatch.await(6000, TimeUnit.MILLISECONDS)) {
throw new IOException("Error connecting to zookeeper");
}
if (zkc.exists(zkPath, false) == null) {
zkc.create(zkPath, new byte[] {'0'},
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
Stat versionStat = zkc.exists(versionPath, false);
if (versionStat != null) {
byte[] d = zkc.getData(versionPath, false, versionStat);
VersionProto.Builder builder = VersionProto.newBuilder();
TextFormat.merge(new String(d, UTF_8), builder);
if (!builder.isInitialized()) {
throw new IOException("Invalid/Incomplete data in znode");
}
VersionProto vp = builder.build();
// There's only one version at the moment
assert vp.getLayoutVersion() == BKJM_LAYOUT_VERSION;
NamespaceInfo readns = PBHelper.convert(vp.getNamespaceInfo());
if (nsInfo.getNamespaceID() != readns.getNamespaceID() ||
!nsInfo.clusterID.equals(readns.getClusterID()) ||
!nsInfo.getBlockPoolID().equals(readns.getBlockPoolID())) {
String err = String.format("Environment mismatch. Running process %s"
+", stored in ZK %s", nsInfo, readns);
LOG.error(err);
throw new IOException(err);
}
} else if (nsInfo.getNamespaceID() > 0) {
VersionProto.Builder builder = VersionProto.newBuilder();
builder.setNamespaceInfo(PBHelper.convert(nsInfo))
.setLayoutVersion(BKJM_LAYOUT_VERSION);
byte[] data = TextFormat.printToString(builder.build()).getBytes(UTF_8);
zkc.create(versionPath, data,
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
if (zkc.exists(ledgerPath, false) == null) {
zkc.create(ledgerPath, new byte[] {'0'},
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
prepareBookKeeperEnv();
bkc = new BookKeeper(new ClientConfiguration(), zkc);
} catch (KeeperException e) {
@ -244,6 +209,7 @@ private void prepareBookKeeperEnv() throws IOException {
BKJM_ZK_LEDGERS_AVAILABLE_PATH_DEFAULT);
final CountDownLatch zkPathLatch = new CountDownLatch(1);
final AtomicBoolean success = new AtomicBoolean(false);
StringCallback callback = new StringCallback() {
@Override
public void processResult(int rc, String path, Object ctx, String name) {
@ -251,22 +217,23 @@ public void processResult(int rc, String path, Object ctx, String name) {
|| KeeperException.Code.NODEEXISTS.intValue() == rc) {
LOG.info("Successfully created bookie available path : "
+ zkAvailablePath);
zkPathLatch.countDown();
success.set(true);
} else {
KeeperException.Code code = KeeperException.Code.get(rc);
LOG
.error("Error : "
LOG.error("Error : "
+ KeeperException.create(code, path).getMessage()
+ ", failed to create bookie available path : "
+ zkAvailablePath);
}
zkPathLatch.countDown();
}
};
ZkUtils.createFullPathOptimistic(zkc, zkAvailablePath, new byte[0],
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT, callback, null);
try {
if (!zkPathLatch.await(zkc.getSessionTimeout(), TimeUnit.MILLISECONDS)) {
if (!zkPathLatch.await(zkc.getSessionTimeout(), TimeUnit.MILLISECONDS)
|| !success.get()) {
throw new IOException("Couldn't create bookie available path :"
+ zkAvailablePath + ", timed out " + zkc.getSessionTimeout()
+ " millis");
@ -281,19 +248,101 @@ public void processResult(int rc, String path, Object ctx, String name) {
@Override
public void format(NamespaceInfo ns) throws IOException {
// Currently, BKJM automatically formats itself when first accessed.
// TODO: change over to explicit formatting so that the admin can
// clear out the BK storage when reformatting a cluster.
LOG.info("Not formatting " + this + " - BKJM does not currently " +
"support reformatting. If it has not been used before, it will" +
"be formatted automatically upon first use.");
try {
// delete old info
Stat baseStat = null;
Stat ledgerStat = null;
if ((baseStat = zkc.exists(basePath, false)) != null) {
if ((ledgerStat = zkc.exists(ledgerPath, false)) != null) {
for (EditLogLedgerMetadata l : getLedgerList(true)) {
try {
bkc.deleteLedger(l.getLedgerId());
} catch (BKException.BKNoSuchLedgerExistsException bke) {
LOG.warn("Ledger " + l.getLedgerId() + " does not exist;"
+ " Cannot delete.");
}
}
}
ZKUtil.deleteRecursive(zkc, basePath);
}
// should be clean now.
zkc.create(basePath, new byte[] {'0'},
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
VersionProto.Builder builder = VersionProto.newBuilder();
builder.setNamespaceInfo(PBHelper.convert(ns))
.setLayoutVersion(BKJM_LAYOUT_VERSION);
byte[] data = TextFormat.printToString(builder.build()).getBytes(UTF_8);
zkc.create(versionPath, data,
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
zkc.create(ledgerPath, new byte[] {'0'},
Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
} catch (KeeperException ke) {
LOG.error("Error accessing zookeeper to format", ke);
throw new IOException("Error accessing zookeeper to format", ke);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
throw new IOException("Interrupted during format", ie);
} catch (BKException bke) {
throw new IOException("Error cleaning up ledgers during format", bke);
}
}
@Override
public boolean hasSomeData() throws IOException {
// Don't confirm format on BKJM, since format() is currently a
// no-op anyway
return false;
try {
return zkc.exists(basePath, false) != null;
} catch (KeeperException ke) {
throw new IOException("Couldn't contact zookeeper", ke);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
throw new IOException("Interrupted while checking for data", ie);
}
}
synchronized private void checkEnv() throws IOException {
if (!initialized) {
try {
Stat versionStat = zkc.exists(versionPath, false);
if (versionStat == null) {
throw new IOException("Environment not initialized. "
+"Have you forgotten to format?");
}
byte[] d = zkc.getData(versionPath, false, versionStat);
VersionProto.Builder builder = VersionProto.newBuilder();
TextFormat.merge(new String(d, UTF_8), builder);
if (!builder.isInitialized()) {
throw new IOException("Invalid/Incomplete data in znode");
}
VersionProto vp = builder.build();
// There's only one version at the moment
assert vp.getLayoutVersion() == BKJM_LAYOUT_VERSION;
NamespaceInfo readns = PBHelper.convert(vp.getNamespaceInfo());
if (nsInfo.getNamespaceID() != readns.getNamespaceID() ||
!nsInfo.clusterID.equals(readns.getClusterID()) ||
!nsInfo.getBlockPoolID().equals(readns.getBlockPoolID())) {
String err = String.format("Environment mismatch. Running process %s"
+", stored in ZK %s", nsInfo, readns);
LOG.error(err);
throw new IOException(err);
}
ci.init();
initialized = true;
} catch (KeeperException ke) {
throw new IOException("Cannot access ZooKeeper", ke);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
throw new IOException("Interrupted while checking environment", ie);
}
}
}
/**
@ -307,6 +356,8 @@ public boolean hasSomeData() throws IOException {
*/
@Override
public EditLogOutputStream startLogSegment(long txId) throws IOException {
checkEnv();
if (txId <= maxTxId.get()) {
throw new IOException("We've already seen " + txId
+ ". A new stream cannot be created with it");
@ -384,6 +435,8 @@ private void cleanupLedger(LedgerHandle lh) {
@Override
public void finalizeLogSegment(long firstTxId, long lastTxId)
throws IOException {
checkEnv();
String inprogressPath = inprogressZNode(firstTxId);
try {
Stat inprogressStat = zkc.exists(inprogressPath, false);
@ -537,6 +590,8 @@ long getNumberOfTransactions(long fromTxId, boolean inProgressOk)
@Override
public void recoverUnfinalizedSegments() throws IOException {
checkEnv();
synchronized (this) {
try {
List<String> children = zkc.getChildren(ledgerPath, false);
@ -589,6 +644,8 @@ public void recoverUnfinalizedSegments() throws IOException {
@Override
public void purgeLogsOlderThan(long minTxIdToKeep)
throws IOException {
checkEnv();
for (EditLogLedgerMetadata l : getLedgerList(false)) {
if (l.getLastTxId() < minTxIdToKeep) {
try {

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@ -56,6 +56,9 @@ class CurrentInprogress {
CurrentInprogress(ZooKeeper zkc, String lockpath) throws IOException {
this.currentInprogressNode = lockpath;
this.zkc = zkc;
}
void init() throws IOException {
try {
Stat isCurrentInprogressNodeExists = zkc.exists(currentInprogressNode,
false);
@ -96,15 +99,14 @@ void update(String path) throws IOException {
this.versionNumberForPermission);
} catch (KeeperException e) {
throw new IOException("Exception when setting the data "
+ "[layout version number,hostname,inprogressNode path]= [" + content
+ "] to CurrentInprogress. ", e);
+ "[" + content + "] to CurrentInprogress. ", e);
} catch (InterruptedException e) {
throw new IOException("Interrupted while setting the data "
+ "[layout version number,hostname,inprogressNode path]= [" + content
+ "] to CurrentInprogress", e);
+ "[" + content + "] to CurrentInprogress", e);
}
if (LOG.isDebugEnabled()) {
LOG.debug("Updated data[" + content + "] to CurrentInprogress");
}
LOG.info("Updated data[layout version number,hostname,inprogressNode path]"
+ "= [" + content + "] to CurrentInprogress");
}
/**
@ -136,7 +138,7 @@ String read() throws IOException {
}
return builder.build().getPath();
} else {
LOG.info("No data available in CurrentInprogress");
LOG.debug("No data available in CurrentInprogress");
}
return null;
}
@ -152,7 +154,7 @@ void clear() throws IOException {
throw new IOException(
"Interrupted when setting the data to CurrentInprogress node", e);
}
LOG.info("Cleared the data from CurrentInprogress");
LOG.debug("Cleared the data from CurrentInprogress");
}
}

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@ -149,6 +149,7 @@ public void testWithConfiguringBKAvailablePath() throws Exception {
bkjm = new BookKeeperJournalManager(conf,
URI.create("bookkeeper://" + HOSTPORT + "/hdfsjournal-WithBKPath"),
nsi);
bkjm.format(nsi);
Assert.assertNotNull("Bookie available path : " + bkAvailablePath
+ " doesn't exists", zkc.exists(bkAvailablePath, false));
}
@ -166,6 +167,7 @@ public void testDefaultBKAvailablePath() throws Exception {
bkjm = new BookKeeperJournalManager(conf,
URI.create("bookkeeper://" + HOSTPORT + "/hdfsjournal-DefaultBKPath"),
nsi);
bkjm.format(nsi);
Assert.assertNotNull("Bookie available path : " + BK_ROOT_PATH
+ " doesn't exists", zkc.exists(BK_ROOT_PATH, false));
}

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@ -29,8 +29,16 @@
import java.io.IOException;
import java.net.URI;
import java.util.List;
import java.util.ArrayList;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Callable;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.server.namenode.EditLogInputStream;
@ -90,6 +98,7 @@ public void testSimpleWrite() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-simplewrite"), nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(1);
for (long i = 1 ; i <= 100; i++) {
@ -112,6 +121,8 @@ public void testNumberOfTransactions() throws Exception {
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-txncount"), nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(1);
for (long i = 1 ; i <= 100; i++) {
FSEditLogOp op = FSEditLogTestUtil.getNoOpInstance();
@ -130,6 +141,7 @@ public void testNumberOfTransactionsWithGaps() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-gaps"), nsi);
bkjm.format(nsi);
long txid = 1;
for (long i = 0; i < 3; i++) {
@ -167,6 +179,7 @@ public void testNumberOfTransactionsWithInprogressAtEnd() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-inprogressAtEnd"), nsi);
bkjm.format(nsi);
long txid = 1;
for (long i = 0; i < 3; i++) {
@ -208,6 +221,7 @@ public void testWriteRestartFrom1() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-restartFrom1"), nsi);
bkjm.format(nsi);
long txid = 1;
long start = txid;
@ -266,6 +280,7 @@ public void testTwoWriters() throws Exception {
BookKeeperJournalManager bkjm1 = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-dualWriter"), nsi);
bkjm1.format(nsi);
BookKeeperJournalManager bkjm2 = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-dualWriter"), nsi);
@ -288,6 +303,7 @@ public void testSimpleRead() throws Exception {
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-simpleread"),
nsi);
bkjm.format(nsi);
final long numTransactions = 10000;
EditLogOutputStream out = bkjm.startLogSegment(1);
@ -315,6 +331,7 @@ public void testSimpleRecovery() throws Exception {
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-simplerecovery"),
nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(1);
for (long i = 1 ; i <= 100; i++) {
@ -365,6 +382,7 @@ public void testAllBookieFailure() throws Exception {
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-allbookiefailure"),
nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(txid);
for (long i = 1 ; i <= 3; i++) {
@ -450,6 +468,7 @@ public void testOneBookieFailure() throws Exception {
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf,
BKJMUtil.createJournalURI("/hdfsjournal-onebookiefailure"),
nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(txid);
for (long i = 1 ; i <= 3; i++) {
@ -500,6 +519,7 @@ public void testEmptyInprogressNode() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf, uri,
nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(1);
for (long i = 1; i <= 100; i++) {
@ -541,6 +561,7 @@ public void testCorruptInprogressNode() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf, uri,
nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(1);
for (long i = 1; i <= 100; i++) {
@ -583,6 +604,7 @@ public void testEmptyInprogressLedger() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf, uri,
nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(1);
for (long i = 1; i <= 100; i++) {
@ -622,6 +644,7 @@ public void testRefinalizeAlreadyFinalizedInprogress() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf, uri,
nsi);
bkjm.format(nsi);
EditLogOutputStream out = bkjm.startLogSegment(1);
for (long i = 1; i <= 100; i++) {
@ -669,6 +692,7 @@ public void testEditLogFileNotExistsWhenReadingMetadata() throws Exception {
NamespaceInfo nsi = newNSInfo();
BookKeeperJournalManager bkjm = new BookKeeperJournalManager(conf, uri,
nsi);
bkjm.format(nsi);
try {
// start new inprogress log segment with txid=1
@ -697,6 +721,81 @@ public void testEditLogFileNotExistsWhenReadingMetadata() throws Exception {
}
}
private enum ThreadStatus {
COMPLETED, GOODEXCEPTION, BADEXCEPTION;
};
/**
* Tests that concurrent calls to format will still allow one to succeed.
*/
@Test
public void testConcurrentFormat() throws Exception {
final URI uri = BKJMUtil.createJournalURI("/hdfsjournal-concurrentformat");
final NamespaceInfo nsi = newNSInfo();
// populate with data first
BookKeeperJournalManager bkjm
= new BookKeeperJournalManager(conf, uri, nsi);
bkjm.format(nsi);
for (int i = 1; i < 100*2; i += 2) {
bkjm.startLogSegment(i);
bkjm.finalizeLogSegment(i, i+1);
}
bkjm.close();
final int numThreads = 40;
List<Callable<ThreadStatus>> threads
= new ArrayList<Callable<ThreadStatus>>();
final CyclicBarrier barrier = new CyclicBarrier(numThreads);
for (int i = 0; i < numThreads; i++) {
threads.add(new Callable<ThreadStatus>() {
public ThreadStatus call() {
BookKeeperJournalManager bkjm = null;
try {
bkjm = new BookKeeperJournalManager(conf, uri, nsi);
barrier.await();
bkjm.format(nsi);
return ThreadStatus.COMPLETED;
} catch (IOException ioe) {
LOG.info("Exception formatting ", ioe);
return ThreadStatus.GOODEXCEPTION;
} catch (InterruptedException ie) {
LOG.error("Interrupted. Something is broken", ie);
Thread.currentThread().interrupt();
return ThreadStatus.BADEXCEPTION;
} catch (Exception e) {
LOG.error("Some other bad exception", e);
return ThreadStatus.BADEXCEPTION;
} finally {
if (bkjm != null) {
try {
bkjm.close();
} catch (IOException ioe) {
LOG.error("Error closing journal manager", ioe);
}
}
}
}
});
}
ExecutorService service = Executors.newFixedThreadPool(numThreads);
List<Future<ThreadStatus>> statuses = service.invokeAll(threads, 60,
TimeUnit.SECONDS);
int numCompleted = 0;
for (Future<ThreadStatus> s : statuses) {
assertTrue(s.isDone());
assertTrue("Thread threw invalid exception",
s.get() == ThreadStatus.COMPLETED
|| s.get() == ThreadStatus.GOODEXCEPTION);
if (s.get() == ThreadStatus.COMPLETED) {
numCompleted++;
}
}
LOG.info("Completed " + numCompleted + " formats");
assertTrue("No thread managed to complete formatting", numCompleted > 0);
}
private String startAndFinalizeLogSegment(BookKeeperJournalManager bkjm,
int startTxid, int endTxid) throws IOException, KeeperException,
InterruptedException {

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@ -118,6 +118,7 @@ public void teardown() throws Exception {
public void testReadShouldReturnTheZnodePathAfterUpdate() throws Exception {
String data = "inprogressNode";
CurrentInprogress ci = new CurrentInprogress(zkc, CURRENT_NODE_PATH);
ci.init();
ci.update(data);
String inprogressNodePath = ci.read();
assertEquals("Not returning inprogressZnode", "inprogressNode",
@ -131,6 +132,7 @@ public void testReadShouldReturnTheZnodePathAfterUpdate() throws Exception {
@Test
public void testReadShouldReturnNullAfterClear() throws Exception {
CurrentInprogress ci = new CurrentInprogress(zkc, CURRENT_NODE_PATH);
ci.init();
ci.update("myInprogressZnode");
ci.read();
ci.clear();
@ -146,6 +148,7 @@ public void testReadShouldReturnNullAfterClear() throws Exception {
public void testUpdateShouldFailWithIOEIfVersionNumberChangedAfterRead()
throws Exception {
CurrentInprogress ci = new CurrentInprogress(zkc, CURRENT_NODE_PATH);
ci.init();
ci.update("myInprogressZnode");
assertEquals("Not returning myInprogressZnode", "myInprogressZnode", ci
.read());
@ -154,4 +157,4 @@ public void testUpdateShouldFailWithIOEIfVersionNumberChangedAfterRead()
ci.update("myInprogressZnode");
}
}
}