For what i'm doing I found it necessary to extend
HRegionServer/HRegion/HClient for some custom functionality.
Following good Java practice I see that the HBase code as been
programmed defensively, keeping stuff private as much as possible.
However, for extensibility it would be nice if the servers/client
were easy to extend.
Attached is a patch that makes several methods protected instead of
private, adds getters to fields of inner classes, and some other
modifications i found were useful for some simple extension code.
I didn't make this a Jira task because I wasn't sure if you guys
approved of opening up the code like this but hopefully someone will
find this useful.
- James K
------------------------------------------------------------------------
Index:
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HClient.java
===================================================================
---
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HClient.java
(revision 549130)
+++
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HClient.java
(working copy)
@@ -62,7 +62,7 @@
/*
* Data structure that holds current location for a region and its
info.
*/
- static class RegionLocation {
+ protected static class RegionLocation {
HRegionInfo regionInfo;
HServerAddress serverAddress;
@@ -76,6 +76,22 @@
return "address: " + this.serverAddress.toString() + ",
regioninfo: " +
this.regionInfo;
}
+
+ public HRegionInfo getRegionInfo() {
+ return regionInfo;
+ }
+
+ public void setRegionInfo(HRegionInfo regionInfo) {
+ this.regionInfo = regionInfo;
+ }
+
+ public HServerAddress getServerAddress() {
+ return serverAddress;
+ }
+
+ public void setServerAddress(HServerAddress serverAddress) {
+ this.serverAddress = serverAddress;
+ }
}
// Map tableName -> (Map startRow -> (HRegionInfo, HServerAddress)
@@ -116,7 +132,7 @@
this.rand = new Random();
}
- private void handleRemoteException(RemoteException e) throws
IOException {
+ protected void handleRemoteException(RemoteException e) throws
IOException {
String msg = e.getMessage();
if(e.getClassName().equals("org.apache.hadoop.hbase.InvalidColumnNameException"))
{
throw new InvalidColumnNameException(msg);
@@ -143,7 +159,7 @@
/* Find the address of the master and connect to it
*/
- private void checkMaster() throws MasterNotRunningException {
+ protected void checkMaster() throws MasterNotRunningException {
if (this.master != null) {
return;
}
@@ -531,7 +547,7 @@
* @param tableName - the table name to be checked
* @throws IllegalArgumentException - if the table name is reserved
*/
- private void checkReservedTableName(Text tableName) {
+ protected void checkReservedTableName(Text tableName) {
if(tableName.equals(ROOT_TABLE_NAME)
|| tableName.equals(META_TABLE_NAME)) {
@@ -547,7 +563,7 @@
//////////////////////////////////////////////////////////////////////////////
// Client API
//////////////////////////////////////////////////////////////////////////////
-
+ /**
* Loads information so that a table can be manipulated.
* @@ -558,8 +574,21 @@
if(tableName == null || tableName.getLength() == 0) {
throw new IllegalArgumentException("table name cannot be null
or zero length");
}
- this.tableServers = tablesToServers.get(tableName);
- if (this.tableServers == null ) {
+ this.tableServers = getTableServers(tableName);
+ }
+ + /**
+ * Gets the servers of the given table.
+ * + * @param tableName - the table to be located
+ * @throws IOException - if the table can not be located after
retrying
+ */
+ protected synchronized SortedMap<Text, RegionLocation>
getTableServers(Text tableName) throws IOException {
+ if(tableName == null || tableName.getLength() == 0) {
+ throw new IllegalArgumentException("table name cannot be null
or zero length");
+ }
+ SortedMap<Text, RegionLocation> serverResult =
tablesToServers.get(tableName);
+ if (serverResult == null ) {
if (LOG.isDebugEnabled()) {
LOG.debug("No servers for " + tableName + ". Doing a find...");
}
@@ -565,8 +594,9 @@
}
// We don't know where the table is.
// Load the information from meta.
- this.tableServers = findServersForTable(tableName);
+ serverResult = findServersForTable(tableName);
}
+ return serverResult;
}
/*
@@ -836,7 +866,7 @@
* @param regionServer - the server to connect to
* @throws IOException
*/
- synchronized HRegionInterface getHRegionConnection(HServerAddress
regionServer)
+ protected synchronized HRegionInterface
getHRegionConnection(HServerAddress regionServer)
throws IOException {
// See if we already have a connection
@@ -916,7 +946,7 @@
* @param row Row to find.
* @return Location of row.
*/
- synchronized RegionLocation getRegionLocation(Text row) {
+ protected synchronized RegionLocation getRegionLocation(Text row) {
if(row == null || row.getLength() == 0) {
throw new IllegalArgumentException("row key cannot be null or
zero length");
}
@@ -1554,6 +1584,20 @@
}
return errCode;
+ } +
+ /**
+ * @return the map of opened servers
+ */
+ protected TreeMap<String, HRegionInterface> getOpenServers(){
+ return servers;
+ }
+
+ /**
+ * @return the configuration for this server
+ */
+ public Configuration getConf(){
+ return conf;
}
/**
@@ -1565,4 +1609,5 @@
int errCode = (new HClient(c)).doCommandLine(args);
System.exit(errCode);
}
+
}
Index:
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegion.java
===================================================================
---
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegion.java
(revision 549130)
+++
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegion.java
(working copy)
@@ -55,7 +55,7 @@
* regionName is a unique identifier for this HRegion. (startKey,
endKey]
* defines the keyspace for this HRegion.
*/
-class HRegion implements HConstants {
+public class HRegion implements HConstants {
static String SPLITDIR = "splits";
static String MERGEDIR = "merges";
static String TMPREGION_PREFIX = "tmpregion_";
@@ -298,7 +298,7 @@
* * @throws IOException
*/
- HRegion(Path rootDir, HLog log, FileSystem fs, Configuration conf,
+ public HRegion(Path rootDir, HLog log, FileSystem fs,
Configuration conf, HRegionInfo regionInfo, Path initialFiles)
throws IOException {
@@ -386,7 +386,7 @@
* This method could take some time to execute, so don't call it
from a * time-sensitive thread.
*/
- Vector<HStoreFile> close() throws IOException {
+ public Vector<HStoreFile> close() throws IOException {
lock.obtainWriteLock();
try {
boolean shouldClose = false;
@@ -548,43 +548,43 @@
// HRegion accessors
//////////////////////////////////////////////////////////////////////////////
- Text getStartKey() {
+ public Text getStartKey() {
return regionInfo.startKey;
}
- Text getEndKey() {
+ public Text getEndKey() {
return regionInfo.endKey;
}
- long getRegionId() {
+ public long getRegionId() {
return regionInfo.regionId;
}
- Text getRegionName() {
+ public Text getRegionName() {
return regionInfo.regionName;
}
- Path getRootDir() {
+ public Path getRootDir() {
return rootDir;
}
- HTableDescriptor getTableDesc() {
+ public HTableDescriptor getTableDesc() {
return regionInfo.tableDesc;
}
- HLog getLog() {
+ public HLog getLog() {
return log;
}
- Configuration getConf() {
+ public Configuration getConf() {
return conf;
}
- Path getRegionDir() {
+ public Path getRegionDir() {
return regiondir;
}
- FileSystem getFilesystem() {
+ public FileSystem getFilesystem() {
return fs;
}
@@ -973,7 +973,7 @@
* Return an iterator that scans over the HRegion, returning the
indicated * columns. This Iterator must be closed by the caller.
*/
- HInternalScannerInterface getScanner(Text[] cols, Text firstRow)
+ public HInternalScannerInterface getScanner(Text[] cols, Text
firstRow)
throws IOException {
lock.obtainReadLock();
try {
@@ -1011,7 +1011,7 @@
* @return lockid
* @see #put(long, Text, BytesWritable)
*/
- long startUpdate(Text row) throws IOException {
+ public long startUpdate(Text row) throws IOException {
// We obtain a per-row lock, so other clients will block while
one client
// performs an update. The read lock is released by the client
calling
// #commit or #abort or if the HRegionServer lease on the lock
expires.
@@ -1029,7 +1029,7 @@
* This method really just tests the input, then calls an internal
localput() * method.
*/
- void put(long lockid, Text targetCol, byte [] val) throws
IOException {
+ public void put(long lockid, Text targetCol, byte [] val) throws
IOException {
if (DELETE_BYTES.compareTo(val) == 0) {
throw new IOException("Cannot insert value: " + val);
}
@@ -1039,7 +1039,7 @@
/**
* Delete a value or write a value. This is a just a convenience
method for put().
*/
- void delete(long lockid, Text targetCol) throws IOException {
+ public void delete(long lockid, Text targetCol) throws IOException {
localput(lockid, targetCol, DELETE_BYTES.get());
}
@@ -1055,7 +1055,7 @@
* @param val Value to enter into cell
* @throws IOException
*/
- void localput(final long lockid, final Text targetCol,
+ public void localput(final long lockid, final Text targetCol,
final byte [] val)
throws IOException {
checkColumn(targetCol);
@@ -1090,7 +1090,7 @@
* writes associated with the given row-lock. These values have
not yet
* been placed in memcache or written to the log.
*/
- void abort(long lockid) throws IOException {
+ public void abort(long lockid) throws IOException {
Text row = getRowFromLock(lockid);
if(row == null) {
throw new LockException("No write lock for lockid " + lockid);
@@ -1124,7 +1124,7 @@
* @param lockid Lock for row we're to commit.
* @throws IOException
*/
- void commit(final long lockid) throws IOException {
+ public void commit(final long lockid) throws IOException {
// Remove the row from the pendingWrites list so // that
repeated executions won't screw this up.
Text row = getRowFromLock(lockid);
Index:
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegionInfo.java
===================================================================
---
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegionInfo.java
(revision 549130)
+++
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegionInfo.java
(working copy)
@@ -139,6 +139,76 @@
this.regionName.readFields(in);
this.offLine = in.readBoolean();
}
+ + /**
+ * @return the endKey
+ */
+ public Text getEndKey(){
+ return endKey;
+ }
+
+ /**
+ * @param endKey the endKey to set
+ */
+ public void setEndKey(Text endKey){
+ this.endKey = endKey;
+ }
+
+ /**
+ * @return the regionId
+ */
+ public long getRegionId(){
+ return regionId;
+ }
+
+ /**
+ * @param regionId the regionId to set
+ */
+ public void setRegionId(long regionId){
+ this.regionId = regionId;
+ }
+
+ /**
+ * @return the regionName
+ */
+ public Text getRegionName(){
+ return regionName;
+ }
+
+ /**
+ * @param regionName the regionName to set
+ */
+ public void setRegionName(Text regionName){
+ this.regionName = regionName;
+ }
+
+ /**
+ * @return the startKey
+ */
+ public Text getStartKey(){
+ return startKey;
+ }
+
+ /**
+ * @param startKey the startKey to set
+ */
+ public void setStartKey(Text startKey){
+ this.startKey = startKey;
+ }
+
+ /**
+ * @return the tableDesc
+ */
+ public HTableDescriptor getTableDesc(){
+ return tableDesc;
+ }
+
+ /**
+ * @param tableDesc the tableDesc to set
+ */
+ public void setTableDesc(HTableDescriptor tableDesc){
+ this.tableDesc = tableDesc;
+ }
//////////////////////////////////////////////////////////////////////////////
// Comparable
@@ -162,4 +232,6 @@
// Compare end keys.
return this.endKey.compareTo(other.endKey);
}
+
+ }
Index:
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegionServer.java
===================================================================
---
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegionServer.java
(revision 549130)
+++
/opt/eclipse/sandbox2/Hadoop/src/contrib/hbase/src/java/org/apache/hadoop/hbase/HRegionServer.java
(working copy)
@@ -468,7 +468,7 @@
* Sets a flag that will cause all the HRegionServer threads to
shut down
* in an orderly fashion.
*/
- synchronized void stop() {
+ public synchronized void stop() {
stopRequested = true;
notifyAll(); // Wakes run() if it is
sleeping
}
@@ -1079,7 +1079,7 @@
}
/** - * Private utility method for safely obtaining an HRegion
handle.
+ * Protected utility method for safely obtaining an HRegion handle.
* @param regionName Name of online [EMAIL PROTECTED] HRegion} to return
* @return [EMAIL PROTECTED] HRegion} for <code>regionName</code>
* @throws NotServingRegionException
@@ -1084,7 +1084,7 @@
* @return [EMAIL PROTECTED] HRegion} for <code>regionName</code>
* @throws NotServingRegionException
*/
- private HRegion getRegion(final Text regionName)
+ protected HRegion getRegion(final Text regionName)
throws NotServingRegionException {
return getRegion(regionName, false);
}
@@ -1090,7 +1090,7 @@
}
/** - * Private utility method for safely obtaining an
HRegion handle.
+ * Protected utility method for safely obtaining an HRegion handle.
* @param regionName Name of online [EMAIL PROTECTED] HRegion} to return
* @param checkRetiringRegions Set true if we're to check retiring
regions
* as well as online regions.
@@ -1097,7 +1097,7 @@
* @return [EMAIL PROTECTED] HRegion} for <code>regionName</code>
* @throws NotServingRegionException
*/
- private HRegion getRegion(final Text regionName,
+ protected HRegion getRegion(final Text regionName,
final boolean checkRetiringRegions)
throws NotServingRegionException {
HRegion region = null;
