ZOOKEEPER-2617: correct a few spelling typos

Hi - this PR contains corrections for some spelling typos.  Most of them appear in comments, but a few appear in documentation and program output.  Thank you for considering it.

Author: tony mancill <tmancilldebian.org>

Reviewers: Flavio Junqueira <fpjapache.org>, Edward Ribeiro <edward.ribeirogmail.com>, Rakesh Radhakrishnan <rakeshrapache.org>

Closes #87 from tmancill/tmancill/spelling-typos

Author: Edward Ribeiro <edward.ribeiro@gmail.com>

Reviewers: Rakesh Radhakrishnan <rakeshr@apache.org>

Closes #174 from eribeiro/ZOOKEEPER-2617

(cherry picked from commit 0816970930bb9565f13d310a1f55636e62cdfd19)
Signed-off-by: Rakesh Radhakrishnan <rakeshr@apache.org>

src/c/include/zookeeper.h

@@ -591,8 +591,8 @@ ZOOAPI const char* zoo_get_current_server(zhandle_t* zh);
  * ZBADARGUMENTS - invalid input parameters
  * ZMARSHALLINGERROR - failed to marshall a request; possibly, out of memory
  * ZOPERATIONTIMEOUT - failed to flush the buffers within the specified timeout.
- * ZCONNECTIONLOSS - a network error occured while attempting to send request to server
- * ZSYSTEMERROR -- a system (OS) error occured; it's worth checking errno to get details
+ * ZCONNECTIONLOSS - a network error occurred while attempting to send request to server
+ * ZSYSTEMERROR -- a system (OS) error occurred; it's worth checking errno to get details
  */
 ZOOAPI int zookeeper_close(zhandle_t *zh);
 
@@ -646,12 +646,12 @@ ZOOAPI struct sockaddr* zookeeper_get_connected_host(zhandle_t *zh,
  * ZOK - success
  * ZBADARGUMENTS - invalid input parameters
  * ZINVALIDSTATE - zhandle state is either ZOO_SESSION_EXPIRED_STATE or ZOO_AUTH_FAILED_STATE
- * ZCONNECTIONLOSS - a network error occured while attempting to establish
+ * ZCONNECTIONLOSS - a network error occurred while attempting to establish
  * a connection to the server
  * ZMARSHALLINGERROR - failed to marshall a request; possibly, out of memory
  * ZOPERATIONTIMEOUT - hasn't received anything from the server for 2/3 of the
  * timeout value specified in zookeeper_init()
- * ZSYSTEMERROR -- a system (OS) error occured; it's worth checking errno to get details
+ * ZSYSTEMERROR -- a system (OS) error occurred; it's worth checking errno to get details
  */
 #ifdef WIN32
 ZOOAPI int zookeeper_interest(zhandle_t *zh, SOCKET *fd, int *interest,
@@ -670,11 +670,11 @@ ZOOAPI int zookeeper_interest(zhandle_t *zh, int *fd, int *interest,
  * ZOK - success
  * ZBADARGUMENTS - invalid input parameters
  * ZINVALIDSTATE - zhandle state is either ZOO_SESSION_EXPIRED_STATE or ZOO_AUTH_FAILED_STATE
- * ZCONNECTIONLOSS - a network error occured while attempting to send request to server
+ * ZCONNECTIONLOSS - a network error occurred while attempting to send request to server
  * ZSESSIONEXPIRED - connection attempt failed -- the session's expired
  * ZAUTHFAILED - authentication request failed, e.i. invalid credentials
  * ZRUNTIMEINCONSISTENCY - a server response came out of order
- * ZSYSTEMERROR -- a system (OS) error occured; it's worth checking errno to get details
+ * ZSYSTEMERROR -- a system (OS) error occurred; it's worth checking errno to get details
  * ZNOTHING -- not an error; simply indicates that there no more data from the server
  *              to be processed (when called with ZOOKEEPER_READ flag).
  */
@@ -1436,7 +1436,7 @@ ZOOAPI const char* zerror(int c);
  * ZBADARGUMENTS - invalid input parameters
  * ZINVALIDSTATE - zhandle state is either ZOO_SESSION_EXPIRED_STATE or ZOO_AUTH_FAILED_STATE
  * ZMARSHALLINGERROR - failed to marshall a request; possibly, out of memory
- * ZSYSTEMERROR - a system error occured
+ * ZSYSTEMERROR - a system error occurred
  */
 ZOOAPI int zoo_add_auth(zhandle_t *zh,const char* scheme,const char* cert,
 	int certLen, void_completion_t completion, const void *data);

src/contrib/zkpython/src/c/pyzk_docstrings.h

@@ -276,7 +276,7 @@ const char pyzk_add_auth_doc[] =
 "BADARGUMENTS - invalid input parameters\n"
 "INVALIDSTATE - zhandle state is either SESSION_EXPIRED_STATE or AUTH_FAILED_STATE\n"
 "MARSHALLINGERROR - failed to marshall a request; possibly, out of memory\n"
-  "SYSTEMERROR - a system error occured\n";
+  "SYSTEMERROR - a system error occurred\n";
 
 const char pyzk_is_unrecoverable_doc[] = 
 " checks if the current zookeeper connection state can't be recovered.\n"
@@ -513,8 +513,8 @@ static const char pyzk_close_doc[] =
 "BADARGUMENTS - invalid input parameters\n"
 "MARSHALLINGERROR - failed to marshall a request; possibly, out of memory\n"
 "OPERATIONTIMEOUT - failed to flush the buffers within the specified timeout.\n"
-"CONNECTIONLOSS - a network error occured while attempting to send request to server\n"
-  "SYSTEMERROR -- a system (OS) error occured; it's worth checking errno to get details\n";
+"CONNECTIONLOSS - a network error occurred while attempting to send request to server\n"
+  "SYSTEMERROR -- a system (OS) error occurred; it's worth checking errno to get details\n";
 
 static const char pyzk_set2_doc[] = 
 "\n"

src/contrib/zkpython/src/c/zookeeper.c

@@ -721,7 +721,7 @@ PyObject *pyzoo_adelete(PyObject *self, PyObject *args)
   return Py_BuildValue("i", err);
 }
 
-/* Asynchronous node existance check, returns integer error code */
+/* Asynchronous node existence check, returns integer error code */
 PyObject *pyzoo_aexists(PyObject *self, PyObject *args)
 {
   int zkhid; char *path; 
@@ -1059,7 +1059,7 @@ static PyObject *pyzoo_delete(PyObject *self, PyObject *args)
   return Py_BuildValue("i", err);
 }
 
-/* Synchronous node existance check, returns stat if exists, None if
+/* Synchronous node existence check, returns stat if exists, None if
    absent */
 static PyObject *pyzoo_exists(PyObject *self, PyObject *args)
 {

src/contrib/zktreeutil/src/ZkAdaptor.cc

@@ -445,7 +445,7 @@ namespace zktreeutil
             if (rc == ZNONODE)
                 return false;
             // Some error
-            std::cerr << "[zktreeutil] Error in checking existance of " << path << std::endl;
+            std::cerr << "[zktreeutil] Error in checking existence of " << path << std::endl;
             throw ZooKeeperException( string("Unable to check existence of node ") + path, rc );
         } else {
             return true;        

src/contrib/zktreeutil/src/ZkAdaptor.h

@@ -255,7 +255,7 @@ namespace zktreeutil
             vector<string> getNodeChildren( const string &path) throw(ZooKeeperException);
 
             /**
-             * \brief Check the existance of path to a znode.
+             * \brief Check the existence of path to a znode.
              * 
              * @param path the absolute path name of the znode
              * @return TRUE if the znode exists; FALSE otherwise

src/contrib/zktreeutil/src/ZkTreeUtil.cc

@@ -347,7 +347,7 @@ namespace zktreeutil
         std::cerr << "[zktreeutil] connected to ZK serverfor reading"
             << std::endl;
 
-        // Check the existance of the path to znode
+        // Check the existence of the path to znode
         if (!zkHandle->nodeExists (path))
         {
             string errMsg = string("[zktreeutil] path does not exists : ") + path;

src/contrib/zooinspector/src/java/org/apache/zookeeper/inspector/manager/ZooInspectorManagerImpl.java

@@ -612,7 +612,7 @@ public class ZooInspectorManagerImpl implements ZooInspectorManager {
                                 zooKeeper));
                     } catch (Exception e) {
                         LoggerFactory.getLogger().error(
-                                "Error occured adding node watcher for node: "
+                                "Error occurred adding node watcher for node: "
                                         + node, e);
                     }
                 }
@@ -687,7 +687,7 @@ public class ZooInspectorManagerImpl implements ZooInspectorManager {
                     }
                 } catch (Exception e) {
                     LoggerFactory.getLogger().error(
-                            "Error occured re-adding node watcherfor node "
+                            "Error occurred re-adding node watcherfor node "
                                     + nodePath, e);
                 }
                 nodeListener.processEvent(event.getPath(), event.getType()

src/docs/src/documentation/conf/cli.xconf

@@ -98,7 +98,7 @@
        |     <broken-links type="none"/>
        |
        |   Two attributes to this node specify whether a page should
-       |   be generated when an error has occured. 'generate' specifies
+       |   be generated when an error has occurred. 'generate' specifies
        |   whether a page should be generated (default: true) and
        |   extension specifies an extension that should be appended
        |   to the generated page's filename (default: none)

src/docs/src/documentation/content/xdocs/zookeeperProgrammers.xml

@@ -1751,7 +1751,7 @@ public abstract class ServerAuthenticationProvider implements AuthenticationProv
         <para>If you are using watches, you must look for the connected watch
         event. When a ZooKeeper client disconnects from a server, you will
         not receive notification of changes until reconnected. If you are
-        watching for a znode to come into existance, you will miss the event
+        watching for a znode to come into existence, you will miss the event
         if the znode is created and deleted while you are disconnected.</para>
       </listitem>
 

src/java/main/org/apache/zookeeper/server/DatadirCleanupManager.java

@@ -139,7 +139,7 @@ public class DatadirCleanupManager {
             try {
                 PurgeTxnLog.purge(logsDir, snapsDir, snapRetainCount);
             } catch (Exception e) {
-                LOG.error("Error occured while purging.", e);
+                LOG.error("Error occurred while purging.", e);
             }
             LOG.info("Purge task completed.");
         }

src/java/main/org/apache/zookeeper/server/ZooKeeperThread.java

@@ -52,6 +52,6 @@ public class ZooKeeperThread extends Thread {
      *            - exception object
      */
     protected void handleException(String thName, Throwable e) {
-        LOG.warn("Exception occured from thread {}", thName, e);
+        LOG.warn("Exception occurred from thread {}", thName, e);
     }
 }

src/java/test/org/apache/zookeeper/server/PurgeTxnTest.java

@@ -570,7 +570,7 @@ public class PurgeTxnTest extends ZKTestCase {
                             zk.create(mynode, new byte[0], Ids.OPEN_ACL_UNSAFE,
                                     CreateMode.PERSISTENT);
                         } catch (Exception e) {
-                            LOG.error("Unexpected exception occured!", e);
+                            LOG.error("Unexpected exception occurred!", e);
                         }
                         if (i == 200) {
                             doPurge.countDown();
@@ -589,8 +589,8 @@ public class PurgeTxnTest extends ZKTestCase {
             Assert.assertTrue("ZkClient ops is not finished!",
                     finished.await(OP_TIMEOUT_IN_MILLIS, TimeUnit.MILLISECONDS));
         } catch (InterruptedException ie) {
-            LOG.error("Unexpected exception occured!", ie);
-            Assert.fail("Unexpected exception occured!");
+            LOG.error("Unexpected exception occurred!", ie);
+            Assert.fail("Unexpected exception occurred!");
         }
         return znodes;
     }