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HADOOP-2347 REST servlet not thread safe but run in a threaded manner 

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk/src/contrib/hbase@601232 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2007-12-05 07:27:59 +00:00
parent 7f52d2e951
commit afeed7bfc6
6 changed files with 37 additions and 44 deletions
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2
CHANGES.txt
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@ -56,6 +56,8 @@ Trunk (unreleased changes)
(Bryan Duxbury via Stack)
HADOOP-2332 Meta table data selection in Hbase Shell
(Edward Yoon via Stack)
HADOOP-2347 REST servlet not thread safe but run in a threaded manner
(Bryan Duxbury via Stack)
IMPROVEMENTS
HADOOP-2401 Add convenience put method that takes writable

3
src/java/org/apache/hadoop/hbase/rest/Dispatcher.java
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@ -61,9 +61,6 @@ import org.apache.hadoop.hbase.util.InfoServer;
*/
public class Dispatcher extends javax.servlet.http.HttpServlet
implements javax.servlet.Servlet {
private static final long serialVersionUID = 1045003206345359301L;
private MetaHandler metaHandler;
private TableHandler tableHandler;
private ScannerHandler scannerHandler;

20
src/java/org/apache/hadoop/hbase/rest/GenericHandler.java
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@ -44,12 +44,8 @@ import org.znerd.xmlenc.XMLOutputter;
* REST handler types take advantage of.
*/
public abstract class GenericHandler {
protected static final long serialVersionUID = 6939910503474376143L;
protected HBaseConfiguration conf;
protected HBaseAdmin admin;
protected HTable table = null;
protected static final String ACCEPT = "accept";
protected static final String COLUMN = "column";
@ -255,16 +251,10 @@ public abstract class GenericHandler {
}
}
protected void focusTable(final String tableName) throws IOException {
// Do we have an HTable instance to suit? TODO, keep a pool of
// instances of HTable. For now, allocate a new one each time table
// focus changes.
if (this.table == null ||
!this.table.getTableName().toString().equals(tableName)) {
if (this.table != null) {
this.table.close();
}
this.table = new HTable(this.conf, new Text(tableName));
}
/*
* Get an HTable instance by it's table name.
*/
protected HTable getTable(final String tableName) throws IOException {
return new HTable(this.conf, new Text(tableName));
}
}

3
src/java/org/apache/hadoop/hbase/rest/MetaHandler.java
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@ -44,7 +44,7 @@ public class MetaHandler extends GenericHandler {
}
public void doGet(HttpServletRequest request, HttpServletResponse response,
public void doGet(HttpServletRequest request, HttpServletResponse response,
String[] pathSegments)
throws ServletException, IOException {
getTables(request, response);
@ -77,6 +77,7 @@ public class MetaHandler extends GenericHandler {
final HttpServletResponse response)
throws IOException {
HTableDescriptor [] tables = this.admin.listTables();
switch (ContentType.getContentType(request.getHeader(ACCEPT))) {
case XML:
setResponseHeader(response, tables.length > 0? 200: 204,

9
src/java/org/apache/hadoop/hbase/rest/ScannerHandler.java
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@ -31,6 +31,7 @@ import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.hbase.HBaseAdmin;
import org.apache.hadoop.hbase.HTable;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HScannerInterface;
@ -248,8 +249,8 @@ public class ScannerHandler extends GenericHandler {
private void openScanner(final HttpServletRequest request,
final HttpServletResponse response, final String [] pathSegments)
throws IOException, ServletException {
// focus on the table
focusTable(getTableName(pathSegments));
// get the table
HTable table = getTable(getTableName(pathSegments));
// get the list of columns we're supposed to interact with
String[] raw_columns = request.getParameterValues(COLUMN);
@ -284,8 +285,8 @@ public class ScannerHandler extends GenericHandler {
HConstants.UTF8_ENCODING));
HScannerInterface scanner = (request.getParameter(END_ROW) == null)?
this.table.obtainScanner(columns, startRow):
this.table.obtainScanner(columns, startRow, endRow);
table.obtainScanner(columns, startRow):
table.obtainScanner(columns, startRow, endRow);
// Make a scanner id by hashing the object toString value (object name +
// an id). Will make identifier less burdensome and more url friendly.

44
src/java/org/apache/hadoop/hbase/rest/TableHandler.java
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@ -38,6 +38,7 @@ import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.HTable;
import org.apache.hadoop.io.Text;
import org.mortbay.servlet.MultiPartResponse;
import org.w3c.dom.Document;
@ -67,14 +68,14 @@ public class TableHandler extends GenericHandler {
getTableMetadata(request, response, pathSegments[0]);
}
else{
focusTable(pathSegments[0]);
HTable table = getTable(pathSegments[0]);
if (pathSegments[1].toLowerCase().equals(REGIONS)) {
// get a region list
getTableRegions(request, response);
getTableRegions(table, request, response);
}
else if (pathSegments[1].toLowerCase().equals(ROW)) {
// get a row
getRow(request, response, pathSegments);
getRow(table, request, response, pathSegments);
}
else{
doNotFound(response, "Not handled in TableHandler");
@ -108,7 +109,7 @@ public class TableHandler extends GenericHandler {
* @throws IOException
* Retrieve a row in one of several output formats.
*/
private void getRow(final HttpServletRequest request,
private void getRow(HTable table, final HttpServletRequest request,
final HttpServletResponse response, final String [] pathSegments)
throws IOException {
// pull the row key out of the path
@ -132,8 +133,8 @@ public class TableHandler extends GenericHandler {
// Presumption is that this.table has already been focused on target table.
Map<Text, byte[]> result = timestampStr == null ?
this.table.getRow(new Text(row))
: this.table.getRow(new Text(row), Long.parseLong(timestampStr));
table.getRow(new Text(row))
: table.getRow(new Text(row), Long.parseLong(timestampStr));
if (result == null || result.size() == 0) {
doNotFound(response, "Row not found!");
@ -151,7 +152,7 @@ public class TableHandler extends GenericHandler {
}
}
} else {
Map<Text, byte[]> prefiltered_result = this.table.getRow(new Text(row));
Map<Text, byte[]> prefiltered_result = table.getRow(new Text(row));
if (prefiltered_result == null || prefiltered_result.size() == 0) {
doNotFound(response, "Row not found!");
@ -243,13 +244,14 @@ public class TableHandler extends GenericHandler {
private void putRow(final HttpServletRequest request,
final HttpServletResponse response, final String [] pathSegments)
throws IOException, ServletException {
focusTable(pathSegments[0]);
HTable table = getTable(pathSegments[0]);
switch(ContentType.getContentType(request.getHeader(CONTENT_TYPE))) {
case XML:
putRowXml(request, response, pathSegments);
putRowXml(table, request, response, pathSegments);
break;
case MIME:
doNotAcceptable(response);
doNotAcceptable(response, "Don't support multipart/related yet...");
break;
default:
doNotAcceptable(response, "Unsupported Accept Header Content: " +
@ -263,7 +265,7 @@ public class TableHandler extends GenericHandler {
* @param pathSegments
* Decode supplied XML and do a put to Hbase.
*/
private void putRowXml(final HttpServletRequest request,
private void putRowXml(HTable table, final HttpServletRequest request,
final HttpServletResponse response, final String [] pathSegments)
throws IOException, ServletException{
@ -291,7 +293,7 @@ public class TableHandler extends GenericHandler {
try{
// start an update
Text key = new Text(pathSegments[2]);
lock_id = this.table.startUpdate(key);
lock_id = table.startUpdate(key);
// set the columns from the xml
NodeList columns = doc.getElementsByTagName("column");
@ -310,15 +312,15 @@ public class TableHandler extends GenericHandler {
byte[] value = org.apache.hadoop.hbase.util.Base64.decode(value_node.getFirstChild().getNodeValue());
// put the value
this.table.put(lock_id, name, value);
table.put(lock_id, name, value);
}
// commit the update
if (timestamp != null) {
this.table.commit(lock_id, Long.parseLong(timestamp));
table.commit(lock_id, Long.parseLong(timestamp));
}
else{
this.table.commit(lock_id);
table.commit(lock_id);
}
// respond with a 200
@ -326,7 +328,7 @@ public class TableHandler extends GenericHandler {
}
catch(Exception e){
if (lock_id != -1) {
this.table.abort(lock_id);
table.abort(lock_id);
}
throw new ServletException(e);
}
@ -337,11 +339,11 @@ public class TableHandler extends GenericHandler {
* @param request
* @param response
*/
private void getTableRegions(final HttpServletRequest request,
final HttpServletResponse response)
private void getTableRegions(HTable table, final HttpServletRequest request,
final HttpServletResponse response)
throws IOException {
// Presumption is that this.table has already been focused on target table.
Text [] startKeys = this.table.getStartKeys();
Text [] startKeys = table.getStartKeys();
// Presumption is that this.table has already been set against target table
switch (ContentType.getContentType(request.getHeader(ACCEPT))) {
case XML:
@ -445,7 +447,7 @@ public class TableHandler extends GenericHandler {
final HttpServletResponse response, final String [] pathSegments)
throws IOException, ServletException {
// grab the table we're operating on
focusTable(getTableName(pathSegments));
HTable table = getTable(getTableName(pathSegments));
Text key = new Text(pathSegments[2]);
@ -465,7 +467,7 @@ public class TableHandler extends GenericHandler {
} else{
// delete each column in turn
for(int i = 0; i < columns.length; i++){
this.table.deleteAll(key, new Text(columns[i]));
table.deleteAll(key, new Text(columns[i]));
}
}
response.setStatus(202);