ChangeRecord getRecordForPath(String path) throws KeeperException.NoNodeException {
ChangeRecord lastChange = null;
synchronized (zks.outstandingChanges) {
lastChange = zks.outstandingChangesForPath.get(path);
/*
for (int i = 0; i < zks.outstandingChanges.size(); i++) {
ChangeRecord c = zks.outstandingChanges.get(i);
if (c.path.equals(path)) {
lastChange = c;
}
}
*/
if (lastChange == null) {
DataNode n = zks.getZKDatabase().getNode(path);
if (n != null) {
Long acl;
Set<String> children;
synchronized (n) {
acl = n.acl;
children = n.getChildren();
}
lastChange =
new ChangeRecord(
-1,
path,
n.stat,
children != null ? children.size() : 0,
zks.getZKDatabase().convertLong(acl));
}
}
}
if (lastChange == null || lastChange.stat == null) {
throw new KeeperException.NoNodeException(path);
}
return lastChange;
}
/**
* This method will be called inside the ProcessRequestThread, which is a singleton, so there will
* be a single thread calling this code.
*
* @param request
*/
@SuppressWarnings("unchecked")
protected void pRequest(Request request) throws RequestProcessorException {
// LOG.info("Prep>>> cxid = " + request.cxid + " type = " +
// request.type + " id = 0x" + Long.toHexString(request.sessionId));
TxnHeader txnHeader = null;
Record txn = null;
try {
switch (request.type) {
case OpCode.create:
txnHeader =
new TxnHeader(
request.sessionId, request.cxid, zks.getNextZxid(), zks.getTime(), OpCode.create);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
CreateRequest createRequest = new CreateRequest();
ZooKeeperServer.byteBuffer2Record(request.request, createRequest);
String path = createRequest.getPath();
int lastSlash = path.lastIndexOf('/');
if (lastSlash == -1 || path.indexOf('\0') != -1 || failCreate) {
LOG.info(
"Invalid path " + path + " with session 0x" + Long.toHexString(request.sessionId));
throw new KeeperException.BadArgumentsException(path);
}
if (!fixupACL(request.authInfo, createRequest.getAcl())) {
throw new KeeperException.InvalidACLException(path);
}
String parentPath = path.substring(0, lastSlash);
ChangeRecord parentRecord = getRecordForPath(parentPath);
checkACL(zks, parentRecord.acl, ZooDefs.Perms.CREATE, request.authInfo);
int parentCVersion = parentRecord.stat.getCversion();
CreateMode createMode = CreateMode.fromFlag(createRequest.getFlags());
if (createMode.isSequential()) {
path = path + String.format(Locale.ENGLISH, "%010d", parentCVersion);
}
try {
PathUtils.validatePath(path);
} catch (IllegalArgumentException ie) {
LOG.info(
"Invalid path " + path + " with session 0x" + Long.toHexString(request.sessionId));
throw new KeeperException.BadArgumentsException(path);
}
try {
if (getRecordForPath(path) != null) {
throw new KeeperException.NodeExistsException(path);
}
} catch (KeeperException.NoNodeException e) {
// ignore this one
}
boolean ephemeralParent = parentRecord.stat.getEphemeralOwner() != 0;
if (ephemeralParent) {
throw new KeeperException.NoChildrenForEphemeralsException(path);
}
txn =
new CreateTxn(
path, createRequest.getData(), createRequest.getAcl(), createMode.isEphemeral());
StatPersisted s = new StatPersisted();
if (createMode.isEphemeral()) {
s.setEphemeralOwner(request.sessionId);
}
parentRecord = parentRecord.duplicate(txnHeader.getZxid());
parentRecord.childCount++;
parentRecord.stat.setCversion(parentRecord.stat.getCversion() + 1);
addChangeRecord(parentRecord);
addChangeRecord(
new ChangeRecord(txnHeader.getZxid(), path, s, 0, createRequest.getAcl()));
break;
case OpCode.delete:
txnHeader =
new TxnHeader(
request.sessionId, request.cxid, zks.getNextZxid(), zks.getTime(), OpCode.delete);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
DeleteRequest deleteRequest = new DeleteRequest();
ZooKeeperServer.byteBuffer2Record(request.request, deleteRequest);
path = deleteRequest.getPath();
lastSlash = path.lastIndexOf('/');
if (lastSlash == -1
|| path.indexOf('\0') != -1
|| zks.getZKDatabase().isSpecialPath(path)) {
throw new KeeperException.BadArgumentsException(path);
}
parentPath = path.substring(0, lastSlash);
parentRecord = getRecordForPath(parentPath);
ChangeRecord nodeRecord = getRecordForPath(path);
checkACL(zks, parentRecord.acl, ZooDefs.Perms.DELETE, request.authInfo);
int version = deleteRequest.getVersion();
if (version != -1 && nodeRecord.stat.getVersion() != version) {
throw new KeeperException.BadVersionException(path);
}
if (nodeRecord.childCount > 0) {
throw new KeeperException.NotEmptyException(path);
}
txn = new DeleteTxn(path);
parentRecord = parentRecord.duplicate(txnHeader.getZxid());
parentRecord.childCount--;
parentRecord.stat.setCversion(parentRecord.stat.getCversion() + 1);
addChangeRecord(parentRecord);
addChangeRecord(new ChangeRecord(txnHeader.getZxid(), path, null, -1, null));
break;
case OpCode.setData:
txnHeader =
new TxnHeader(
request.sessionId,
request.cxid,
zks.getNextZxid(),
zks.getTime(),
OpCode.setData);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
SetDataRequest setDataRequest = new SetDataRequest();
ZooKeeperServer.byteBuffer2Record(request.request, setDataRequest);
path = setDataRequest.getPath();
nodeRecord = getRecordForPath(path);
checkACL(zks, nodeRecord.acl, ZooDefs.Perms.WRITE, request.authInfo);
version = setDataRequest.getVersion();
int currentVersion = nodeRecord.stat.getVersion();
if (version != -1 && version != currentVersion) {
throw new KeeperException.BadVersionException(path);
}
version = currentVersion + 1;
txn = new SetDataTxn(path, setDataRequest.getData(), version);
nodeRecord = nodeRecord.duplicate(txnHeader.getZxid());
nodeRecord.stat.setVersion(version);
addChangeRecord(nodeRecord);
break;
case OpCode.setACL:
txnHeader =
new TxnHeader(
request.sessionId, request.cxid, zks.getNextZxid(), zks.getTime(), OpCode.setACL);
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
SetACLRequest setAclRequest = new SetACLRequest();
ZooKeeperServer.byteBuffer2Record(request.request, setAclRequest);
path = setAclRequest.getPath();
if (!fixupACL(request.authInfo, setAclRequest.getAcl())) {
throw new KeeperException.InvalidACLException(path);
}
nodeRecord = getRecordForPath(path);
checkACL(zks, nodeRecord.acl, ZooDefs.Perms.ADMIN, request.authInfo);
version = setAclRequest.getVersion();
currentVersion = nodeRecord.stat.getAversion();
if (version != -1 && version != currentVersion) {
throw new KeeperException.BadVersionException(path);
}
version = currentVersion + 1;
txn = new SetACLTxn(path, setAclRequest.getAcl(), version);
nodeRecord = nodeRecord.duplicate(txnHeader.getZxid());
nodeRecord.stat.setAversion(version);
addChangeRecord(nodeRecord);
break;
case OpCode.createSession:
txnHeader =
new TxnHeader(
request.sessionId,
request.cxid,
zks.getNextZxid(),
zks.getTime(),
OpCode.createSession);
request.request.rewind();
int to = request.request.getInt();
txn = new CreateSessionTxn(to);
request.request.rewind();
zks.sessionTracker.addSession(request.sessionId, to);
zks.setOwner(request.sessionId, request.getOwner());
break;
case OpCode.closeSession:
txnHeader =
new TxnHeader(
request.sessionId,
request.cxid,
zks.getNextZxid(),
zks.getTime(),
OpCode.closeSession);
// We don't want to do this check since the session expiration thread
// queues up this operation without being the session owner.
// this request is the last of the session so it should be ok
// zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
HashSet<String> es = zks.getZKDatabase().getEphemerals(request.sessionId);
synchronized (zks.outstandingChanges) {
for (ChangeRecord c : zks.outstandingChanges) {
if (c.stat == null) {
// Doing a delete
es.remove(c.path);
} else if (c.stat.getEphemeralOwner() == request.sessionId) {
es.add(c.path);
}
}
for (String path2Delete : es) {
addChangeRecord(new ChangeRecord(txnHeader.getZxid(), path2Delete, null, 0, null));
}
zks.sessionTracker.setSessionClosing(request.sessionId);
}
LOG.info(
"Processed session termination for sessionid: 0x"
+ Long.toHexString(request.sessionId));
break;
case OpCode.sync:
case OpCode.exists:
case OpCode.getData:
case OpCode.getACL:
case OpCode.getChildren:
case OpCode.getChildren2:
case OpCode.ping:
case OpCode.setWatches:
zks.sessionTracker.checkSession(request.sessionId, request.getOwner());
break;
}
} catch (KeeperException e) {
if (txnHeader != null) {
txnHeader.setType(OpCode.error);
txn = new ErrorTxn(e.code().intValue());
}
LOG.info(
"Got user-level KeeperException when processing "
+ request.toString()
+ " Error Path:"
+ e.getPath()
+ " Error:"
+ e.getMessage());
request.setException(e);
} catch (Exception e) {
// log at error level as we are returning a marshalling
// error to the user
LOG.error("Failed to process " + request, e);
StringBuilder sb = new StringBuilder();
ByteBuffer bb = request.request;
if (bb != null) {
bb.rewind();
while (bb.hasRemaining()) {
sb.append(Integer.toHexString(bb.get() & 0xff));
}
} else {
sb.append("request buffer is null");
}
LOG.error("Dumping request buffer: 0x" + sb.toString());
if (txnHeader != null) {
txnHeader.setType(OpCode.error);
txn = new ErrorTxn(Code.MARSHALLINGERROR.intValue());
}
}
request.hdr = txnHeader;
request.txn = txn;
request.zxid = zks.getZxid();
nextProcessor.processRequest(request);
}
public void processRequest(Request request) {
if (LOG.isDebugEnabled()) {
LOG.debug("Processing request:: " + request);
}
// request.addRQRec(">final");
long traceMask = ZooTrace.CLIENT_REQUEST_TRACE_MASK;
if (request.type == OpCode.ping) {
traceMask = ZooTrace.SERVER_PING_TRACE_MASK;
}
if (LOG.isTraceEnabled()) {
ZooTrace.logRequest(LOG, traceMask, 'E', request, "");
}
ProcessTxnResult rc = null;
synchronized (zks.outstandingChanges) {
while (!zks.outstandingChanges.isEmpty()
&& zks.outstandingChanges.get(0).zxid <= request.zxid) {
ChangeRecord cr = zks.outstandingChanges.remove(0);
if (cr.zxid < request.zxid) {
LOG.warn("Zxid outstanding " + cr.zxid + " is less than current " + request.zxid);
}
if (zks.outstandingChangesForPath.get(cr.path) == cr) {
zks.outstandingChangesForPath.remove(cr.path);
}
}
if (request.hdr != null) {
TxnHeader hdr = request.hdr;
Record txn = request.txn;
rc = zks.processTxn(hdr, txn);
}
// do not add non quorum packets to the queue.
if (Request.isQuorum(request.type)) {
zks.getZKDatabase().addCommittedProposal(request);
}
}
if (request.hdr != null && request.hdr.getType() == OpCode.closeSession) {
ServerCnxnFactory scxn = zks.getServerCnxnFactory();
// this might be possible since
// we might just be playing diffs from the leader
if (scxn != null && request.cnxn == null) {
// calling this if we have the cnxn results in the client's
// close session response being lost - we've already closed
// the session/socket here before we can send the closeSession
// in the switch block below
scxn.closeSession(request.sessionId);
return;
}
}
if (request.cnxn == null) {
return;
}
ServerCnxn cnxn = request.cnxn;
String lastOp = "NA";
zks.decInProcess();
Code err = Code.OK;
Record rsp = null;
boolean closeSession = false;
try {
if (request.hdr != null && request.hdr.getType() == OpCode.error) {
throw KeeperException.create(KeeperException.Code.get(((ErrorTxn) request.txn).getErr()));
}
KeeperException ke = request.getException();
if (ke != null && request.type != OpCode.multi) {
throw ke;
}
if (LOG.isDebugEnabled()) {
LOG.debug("{}", request);
}
switch (request.type) {
case OpCode.ping:
{
zks.serverStats().updateLatency(request.createTime);
lastOp = "PING";
cnxn.updateStatsForResponse(
request.cxid, request.zxid, lastOp, request.createTime, System.currentTimeMillis());
cnxn.sendResponse(
new ReplyHeader(-2, zks.getZKDatabase().getDataTreeLastProcessedZxid(), 0),
null,
"response");
return;
}
case OpCode.createSession:
{
zks.serverStats().updateLatency(request.createTime);
lastOp = "SESS";
cnxn.updateStatsForResponse(
request.cxid, request.zxid, lastOp, request.createTime, System.currentTimeMillis());
zks.finishSessionInit(request.cnxn, true);
return;
}
case OpCode.multi:
{
lastOp = "MULT";
rsp = new MultiResponse();
for (ProcessTxnResult subTxnResult : rc.multiResult) {
OpResult subResult;
switch (subTxnResult.type) {
case OpCode.check:
subResult = new CheckResult();
break;
case OpCode.create:
subResult = new CreateResult(subTxnResult.path);
break;
case OpCode.delete:
subResult = new DeleteResult();
break;
case OpCode.setData:
subResult = new SetDataResult(subTxnResult.stat);
break;
case OpCode.error:
subResult = new ErrorResult(subTxnResult.err);
break;
default:
throw new IOException("Invalid type of op");
}
((MultiResponse) rsp).add(subResult);
}
break;
}
case OpCode.create:
{
lastOp = "CREA";
rsp = new CreateResponse(rc.path);
err = Code.get(rc.err);
break;
}
case OpCode.delete:
{
lastOp = "DELE";
err = Code.get(rc.err);
break;
}
case OpCode.setData:
{
lastOp = "SETD";
rsp = new SetDataResponse(rc.stat);
err = Code.get(rc.err);
break;
}
case OpCode.setACL:
{
lastOp = "SETA";
rsp = new SetACLResponse(rc.stat);
err = Code.get(rc.err);
break;
}
case OpCode.closeSession:
{
lastOp = "CLOS";
closeSession = true;
err = Code.get(rc.err);
break;
}
case OpCode.sync:
{
lastOp = "SYNC";
SyncRequest syncRequest = new SyncRequest();
ByteBufferInputStream.byteBuffer2Record(request.request, syncRequest);
rsp = new SyncResponse(syncRequest.getPath());
break;
}
case OpCode.check:
{
lastOp = "CHEC";
rsp = new SetDataResponse(rc.stat);
err = Code.get(rc.err);
break;
}
case OpCode.exists:
{
lastOp = "EXIS";
// TODO we need to figure out the security requirement for this!
ExistsRequest existsRequest = new ExistsRequest();
ByteBufferInputStream.byteBuffer2Record(request.request, existsRequest);
String path = existsRequest.getPath();
if (path.indexOf('\0') != -1) {
throw new KeeperException.BadArgumentsException();
}
Stat stat = zks.getZKDatabase().statNode(path, existsRequest.getWatch() ? cnxn : null);
rsp = new ExistsResponse(stat);
break;
}
case OpCode.getData:
{
lastOp = "GETD";
GetDataRequest getDataRequest = new GetDataRequest();
ByteBufferInputStream.byteBuffer2Record(request.request, getDataRequest);
DataNode n = zks.getZKDatabase().getNode(getDataRequest.getPath());
if (n == null) {
throw new KeeperException.NoNodeException();
}
Long aclL;
synchronized (n) {
aclL = n.acl;
}
PrepRequestProcessor.checkACL(
zks, zks.getZKDatabase().convertLong(aclL), ZooDefs.Perms.READ, request.authInfo);
Stat stat = new Stat();
byte b[] =
zks.getZKDatabase()
.getData(
getDataRequest.getPath(), stat, getDataRequest.getWatch() ? cnxn : null);
rsp = new GetDataResponse(b, stat);
break;
}
case OpCode.setWatches:
{
lastOp = "SETW";
SetWatches setWatches = new SetWatches();
// XXX We really should NOT need this!!!!
request.request.rewind();
ByteBufferInputStream.byteBuffer2Record(request.request, setWatches);
long relativeZxid = setWatches.getRelativeZxid();
zks.getZKDatabase()
.setWatches(
relativeZxid,
setWatches.getDataWatches(),
setWatches.getExistWatches(),
setWatches.getChildWatches(),
cnxn);
break;
}
case OpCode.getACL:
{
lastOp = "GETA";
GetACLRequest getACLRequest = new GetACLRequest();
ByteBufferInputStream.byteBuffer2Record(request.request, getACLRequest);
Stat stat = new Stat();
List<ACL> acl = zks.getZKDatabase().getACL(getACLRequest.getPath(), stat);
rsp = new GetACLResponse(acl, stat);
break;
}
case OpCode.getChildren:
{
lastOp = "GETC";
GetChildrenRequest getChildrenRequest = new GetChildrenRequest();
ByteBufferInputStream.byteBuffer2Record(request.request, getChildrenRequest);
DataNode n = zks.getZKDatabase().getNode(getChildrenRequest.getPath());
if (n == null) {
throw new KeeperException.NoNodeException();
}
Long aclG;
synchronized (n) {
aclG = n.acl;
}
PrepRequestProcessor.checkACL(
zks, zks.getZKDatabase().convertLong(aclG), ZooDefs.Perms.READ, request.authInfo);
List<String> children =
zks.getZKDatabase()
.getChildren(
getChildrenRequest.getPath(),
null,
getChildrenRequest.getWatch() ? cnxn : null);
rsp = new GetChildrenResponse(children);
break;
}
case OpCode.getChildren2:
{
lastOp = "GETC";
GetChildren2Request getChildren2Request = new GetChildren2Request();
ByteBufferInputStream.byteBuffer2Record(request.request, getChildren2Request);
Stat stat = new Stat();
DataNode n = zks.getZKDatabase().getNode(getChildren2Request.getPath());
if (n == null) {
throw new KeeperException.NoNodeException();
}
Long aclG;
synchronized (n) {
aclG = n.acl;
}
PrepRequestProcessor.checkACL(
zks, zks.getZKDatabase().convertLong(aclG), ZooDefs.Perms.READ, request.authInfo);
List<String> children =
zks.getZKDatabase()
.getChildren(
getChildren2Request.getPath(),
stat,
getChildren2Request.getWatch() ? cnxn : null);
rsp = new GetChildren2Response(children, stat);
break;
}
}
} catch (SessionMovedException e) {
// session moved is a connection level error, we need to tear
// down the connection otw ZOOKEEPER-710 might happen
// ie client on slow follower starts to renew session, fails
// before this completes, then tries the fast follower (leader)
// and is successful, however the initial renew is then
// successfully fwd/processed by the leader and as a result
// the client and leader disagree on where the client is most
// recently attached (and therefore invalid SESSION MOVED generated)
cnxn.sendCloseSession();
return;
} catch (KeeperException e) {
err = e.code();
} catch (Exception e) {
// log at error level as we are returning a marshalling
// error to the user
LOG.error("Failed to process " + request, e);
StringBuilder sb = new StringBuilder();
ByteBuffer bb = request.request;
bb.rewind();
while (bb.hasRemaining()) {
sb.append(Integer.toHexString(bb.get() & 0xff));
}
LOG.error("Dumping request buffer: 0x" + sb.toString());
err = Code.MARSHALLINGERROR;
}
long lastZxid = zks.getZKDatabase().getDataTreeLastProcessedZxid();
ReplyHeader hdr = new ReplyHeader(request.cxid, lastZxid, err.intValue());
zks.serverStats().updateLatency(request.createTime);
cnxn.updateStatsForResponse(
request.cxid, lastZxid, lastOp, request.createTime, System.currentTimeMillis());
try {
cnxn.sendResponse(hdr, rsp, "response");
if (closeSession) {
cnxn.sendCloseSession();
}
} catch (IOException e) {
LOG.error("FIXMSG", e);
}
}