* activated write buffer for databases.

This should increase IO performance and reduce HD activity
* bugfixes for new exception-on-failure policy
* bugfixes for new IOChunks
* new Object pool for database write-buffer


git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@1204 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/kelondro/kelondroAbstractIOChunks.java

@@ -59,11 +59,14 @@ public abstract class kelondroAbstractIOChunks {
 
     // derived methods:
     public void readFully(long pos, byte[] b, int off, int len) throws IOException {
-        final int r = read(pos, b, off, len);
-        if (r < 0) return; // read exceeded EOF
-        if (r < len) {
+        if (len < 0) throw new IndexOutOfBoundsException("length is negative:" + len);
+        if (b.length < off + len) throw new IndexOutOfBoundsException("bounds do not fit: b.length=" + b.length + ", off=" + off + ", len=" + len);
+        while (len > 0) {
+            int r = read(pos, b, off, len);
+            if (r < 0) throw new IOException("EOF"); // read exceeded EOF
             pos += r;
-            readFully(pos, b, off + r, len - r);
+            off += r;
+            len -= r;
         }
     }
 

source/de/anomic/kelondro/kelondroAbstractRA.java

@@ -71,9 +71,14 @@ abstract class kelondroAbstractRA implements kelondroRA {
 
     // derived methods:
     public void readFully(byte[] b, int off, int len) throws IOException {
-        final int r = read(b, off, len);
-        if (r < 0) return; // read exceeded EOF
-        if (r < len) { readFully(b, off + r, len - r); }
+        if (len < 0) throw new IndexOutOfBoundsException("length is negative:" + len);
+        if (b.length < off + len) throw new IndexOutOfBoundsException("bounds do not fit: b.length=" + b.length + ", off=" + off + ", len=" + len);
+        while (len > 0) {
+            int r = read(b, off, len);
+            if (r < 0) throw new IOException("EOF"); // read exceeded EOF
+            off += r;
+            len -= r;
+        }
     }
 
     public byte readByte() throws IOException {

source/de/anomic/kelondro/kelondroBufferedIOChunks.java

@@ -52,16 +52,19 @@ import java.util.Map;
 public final class kelondroBufferedIOChunks extends kelondroAbstractIOChunks implements kelondroIOChunks {
 
     protected kelondroRA ra;
-    private int bufferkb;
+    private int bufferMaxSize, bufferCurrSize;
     private long commitTimeout;
     private HashMap buffer;
     private long lastCommit = 0;
     
+    private static final int overhead = 40;
+    
     
     public kelondroBufferedIOChunks(kelondroRA ra, String name, int bufferkb, long commitTimeout) {
         this.name = name;
         this.ra = ra;
-        this.bufferkb = bufferkb;
+        this.bufferMaxSize = 1024 * bufferkb;
+        this.bufferCurrSize = 0;
         this.commitTimeout = commitTimeout;
         this.buffer = new HashMap();
         this.lastCommit = System.currentTimeMillis();
@@ -71,35 +74,33 @@ public final class kelondroBufferedIOChunks extends kelondroAbstractIOChunks imp
         assert (b.length >= off + len): "read pos=" + pos  + ", b.length=" + b.length + ", off=" + off + ", len=" + len;
         
         // check commit time
-        if (this.lastCommit + this.commitTimeout > System.currentTimeMillis()) {
+        if ((bufferCurrSize > bufferMaxSize) ||
+            (this.lastCommit + this.commitTimeout < System.currentTimeMillis())) {
             commit();
             this.lastCommit = System.currentTimeMillis();
         }
-        
+
         // do the read
-        if ((off == 0) && (b.length == len)) {
-            synchronized (this.buffer) {
-                byte[] bb = (byte[]) buffer.get(new Long(pos));
-                if (bb == null) {
-                    synchronized (this.ra) {
-                        this.ra.seek(pos);
-                        return ra.read(b, off, len);
-                    }
+        synchronized (this.buffer) {
+            byte[] bb = (byte[]) buffer.get(new Long(pos));
+            if (bb == null) {
+                // entry not known, read direktly from IO
+                synchronized (this.ra) {
+                    this.ra.seek(pos + off);
+                    return ra.read(b, off, len);
+                }
+            } else {
+                // use buffered entry
+                if (bb.length >= off + len) {
+                    // the bufferd entry is long enough
+                    System.arraycopy(bb, off, b, off, len);
+                    return len;
                 } else {
-                    if (bb.length >= len) {
-                        System.arraycopy(bb, 0, b, off, len);
-                        return len;
-                    } else {
-                        System.arraycopy(bb, 0, b, off, bb.length); 
-                        return bb.length;
-                    }
+                    // the entry is not long enough. transmit only a part
+                    System.arraycopy(bb, off, b, off, bb.length - off);
+                    return bb.length - off;
                 }
             }
-        } else {
-            byte[] bb = new byte[len];
-            int r = read(pos + off, bb, 0, len);
-            System.arraycopy(bb, 0, b, off, r);
-            return r;
         }
     }
 
@@ -107,14 +108,16 @@ public final class kelondroBufferedIOChunks extends kelondroAbstractIOChunks imp
         assert (b.length >= off + len): "write pos=" + pos + ", b.length=" + b.length + ", b='" + new String(b) + "', off=" + off + ", len=" + len;
 
         // do the write into buffer
-        byte[] bb = new byte[len];
+        byte[] bb = kelondroObjectSpace.alloc(len);
         System.arraycopy(b, off, bb, 0, len);
         synchronized (buffer) {
-            buffer.put(new Long(pos), bb);
+            buffer.put(new Long(pos + off), bb);
+            bufferCurrSize += overhead + pos + off;
         }
         
         // check commit time
-        if (this.lastCommit + this.commitTimeout > System.currentTimeMillis()) {
+        if ((bufferCurrSize > bufferMaxSize) ||
+            (this.lastCommit + this.commitTimeout < System.currentTimeMillis())) {
             commit();
             this.lastCommit = System.currentTimeMillis();
         }
@@ -134,9 +137,11 @@ public final class kelondroBufferedIOChunks extends kelondroAbstractIOChunks imp
                     b = (byte[]) entry.getValue();
                     this.ra.seek(pos);
                     this.ra.write(b);
+                    kelondroObjectSpace.recycle(b);
                 }
             }
             buffer.clear();
+            bufferCurrSize = 0;
         }
     }
     
@@ -152,5 +157,5 @@ public final class kelondroBufferedIOChunks extends kelondroAbstractIOChunks imp
         if (this.ra != null) this.close();
         super.finalize();
     }
-
+    
 }

source/de/anomic/kelondro/kelondroObjectSpace.java

@@ -0,0 +1,80 @@
+// kelondroObjectSpace.java 
+// ------------------------
+// part of The Kelondro Database
+// (C) by Michael Peter Christen; mc@anomic.de
+// first published on http://www.anomic.de
+// Frankfurt, Germany, 2005
+// created: 12.12.2004
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+// Using this software in any meaning (reading, learning, copying, compiling,
+// running) means that you agree that the Author(s) is (are) not responsible
+// for cost, loss of data or any harm that may be caused directly or indirectly
+// by usage of this softare or this documentation. The usage of this software
+// is on your own risk. The installation and usage (starting/running) of this
+// software may allow other people or application to access your computer and
+// any attached devices and is highly dependent on the configuration of the
+// software which must be done by the user of the software; the author(s) is
+// (are) also not responsible for proper configuration and usage of the
+// software, even if provoked by documentation provided together with
+// the software.
+//
+// Any changes to this file according to the GPL as documented in the file
+// gpl.txt aside this file in the shipment you received can be done to the
+// lines that follows this copyright notice here, but changes must not be
+// done inside the copyright notive above. A re-distribution must contain
+// the intact and unchanged copyright notice.
+// Contributions and changes to the program code must be marked as such.
+
+package de.anomic.kelondro;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+public class kelondroObjectSpace {
+
+    private static final int minSize = 10;
+    private static HashMap objects = new HashMap();
+    
+    public static byte[] alloc(int len) {
+        if (len < minSize) return new byte[len];
+        synchronized (objects) {
+            ArrayList buf = (ArrayList) objects.get(new Integer(len));
+            if ((buf == null) || (buf.size() == 0)) return new byte[len];
+            return (byte[]) buf.remove(buf.size() - 1);
+        }
+    }
+    
+    public static void recycle(byte[] b) {
+        if (b.length < minSize) {
+            b = null;
+            return;
+        }
+        synchronized (objects) {
+            final Integer i = new Integer(b.length);
+            ArrayList buf = (ArrayList) objects.get(i);
+            if (buf == null) {
+                buf = new ArrayList();
+                buf.add(b);
+                objects.put(i, buf);
+            } else {
+                buf.add(b);
+            }
+        }
+        b = null;
+    }
+    
+}

source/de/anomic/kelondro/kelondroRecords.java

@@ -72,6 +72,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.NoSuchElementException;
+import java.util.Random;
 import java.util.StringTokenizer;
 import java.util.Map;
 import java.util.Iterator;
@@ -151,6 +152,9 @@ public class kelondroRecords {
 
     // optional logger
     protected Logger theLogger = null;
+    
+    // Random. This is used to shift flush-times of write-buffers to differrent time
+    private static Random random = new Random(System.currentTimeMillis());
 
     private class usageControl {
         private   int               USEDC;       // counter of used elements
@@ -219,8 +223,8 @@ public class kelondroRecords {
                       int[] columns, int FHandles, int txtProps, int txtPropWidth) throws IOException {
 
         // create new Chunked IO
-        //this.entryFile = new kelondroBufferedIOChunks(ra, ra.name(), 1024, 5000);
-        this.entryFile = new kelondroRAIOChunks(ra, ra.name());
+        this.entryFile = new kelondroBufferedIOChunks(ra, ra.name(), 1024, 8000 + random.nextLong() % 2000);
+        //this.entryFile = new kelondroRAIOChunks(ra, ra.name());
         
         // store dynamic run-time data
         this.overhead = ohbytec + 4 * ohhandlec;
@@ -276,6 +280,8 @@ public class kelondroRecords {
         for (int i = 0; i < this.TXTPROPS.length; i++) {
             entryFile.write(POS_TXTPROPS + TXTPROPW * i, ea);
         }
+        
+        this.entryFile.commit();
     }
 
     public void setLogger(Logger newLogger) {
@@ -320,8 +326,8 @@ public class kelondroRecords {
 
     private void init(kelondroRA ra) throws IOException {
         // read from Chunked IO
-        //this.entryFile = new kelondroBufferedIOChunks(ra, ra.name(), 1024, 5000);
-        this.entryFile = new kelondroRAIOChunks(ra, ra.name());
+        this.entryFile = new kelondroBufferedIOChunks(ra, ra.name(), 1024, 8000 + random.nextLong() % 2000);
+        //this.entryFile = new kelondroRAIOChunks(ra, ra.name());
 
         // read dynamic variables that are back-ups of stored values in file;
         // read/defined on instantiation

source/de/anomic/plasma/plasmaCrawlBalancer.java

@@ -58,7 +58,11 @@ public class plasmaCrawlBalancer {
     
     public plasmaCrawlBalancer(File stackFile, long buffersize) throws IOException {
         if (stackFile.exists())
-            stack = new kelondroStack(stackFile, buffersize);
+            try {
+                stack = new kelondroStack(stackFile, buffersize);
+            } catch (IOException e) {
+                stack = new kelondroStack(stackFile, buffersize, new int[] {plasmaURL.urlHashLength});
+            }
         else
             stack = new kelondroStack(stackFile, buffersize, new int[] {plasmaURL.urlHashLength});
         domainStacks = new HashMap();

source/de/anomic/plasma/plasmaCrawlNURL.java

@@ -120,9 +120,27 @@ public class plasmaCrawlNURL extends plasmaURL {
         limitStack = new plasmaCrawlBalancer(limitStackFile, 0);
         overhangStack = new plasmaCrawlBalancer(overhangStackFile, 0);
         remoteStack = new plasmaCrawlBalancer(remoteStackFile, 0);
-        if (imageStackFile.exists()) imageStack = new kelondroStack(imageStackFile, 0); else imageStack = new kelondroStack(imageStackFile, 0, new int[] {plasmaURL.urlHashLength});
-        if (movieStackFile.exists()) movieStack = new kelondroStack(movieStackFile, 0); else movieStack = new kelondroStack(movieStackFile, 0, new int[] {plasmaURL.urlHashLength});
-        if (musicStackFile.exists()) musicStack = new kelondroStack(musicStackFile, 0); else musicStack = new kelondroStack(musicStackFile, 0, new int[] {plasmaURL.urlHashLength});
+        if (imageStackFile.exists()) try {
+            imageStack = new kelondroStack(imageStackFile, 0);
+        } catch (IOException e) {
+            imageStack = new kelondroStack(imageStackFile, 0, new int[] {plasmaURL.urlHashLength});
+        } else {
+            imageStack = new kelondroStack(imageStackFile, 0, new int[] {plasmaURL.urlHashLength});
+        }
+        if (movieStackFile.exists()) try {
+            movieStack = new kelondroStack(movieStackFile, 0);
+        } catch (IOException e) {
+            movieStack = new kelondroStack(movieStackFile, 0, new int[] {plasmaURL.urlHashLength});
+        } else {
+            movieStack = new kelondroStack(movieStackFile, 0, new int[] {plasmaURL.urlHashLength});
+        }
+        if (musicStackFile.exists()) try {
+            musicStack = new kelondroStack(musicStackFile, 0);
+        } catch (IOException e) {
+            musicStack = new kelondroStack(musicStackFile, 0, new int[] {plasmaURL.urlHashLength});
+        } else {
+            musicStack = new kelondroStack(musicStackFile, 0, new int[] {plasmaURL.urlHashLength});
+        }
 
         // init stack Index
         stackIndex = new HashSet();
@@ -267,7 +285,7 @@ public class plasmaCrawlNURL extends plasmaURL {
         }        
     }
 
-    public Entry pop(int stackType) {
+    public Entry pop(int stackType) throws IOException {
         switch (stackType) {
             case STACK_TYPE_CORE:     return pop(coreStack);
             case STACK_TYPE_LIMIT:    return pop(limitStack);
@@ -281,9 +299,12 @@ public class plasmaCrawlNURL extends plasmaURL {
     }
 
     public void shift(int fromStack, int toStack) {
-        Entry entry = pop(fromStack);
-        if (entry.url() == null) return;
-        push(toStack, entry.url.getHost(), entry.hash());
+        try {
+            Entry entry = pop(fromStack);
+            push(toStack, entry.url.getHost(), entry.hash());
+        } catch (IOException e) {
+            return;
+        }
     }
 
     public void clear(int stackType) {
@@ -301,33 +322,25 @@ public class plasmaCrawlNURL extends plasmaURL {
         } catch (IOException e) {}
     }
 
-    private Entry pop(kelondroStack stack) {
+    private Entry pop(kelondroStack stack) throws IOException {
         // this is a filo - pop
-        try {
-            if (stack.size() > 0) {
-                Entry e = new Entry(new String(stack.pop()[0]));
-                stackIndex.remove(e.hash);
-                return e;
-            } else {
-                return null;
-            }
-        } catch (IOException e) {
-            return null;
+        if (stack.size() > 0) {
+            Entry e = new Entry(new String(stack.pop()[0]));
+            stackIndex.remove(e.hash);
+            return e;
+        } else {
+            throw new IOException("crawl stack is empty");
         }
     }
 
-    private Entry pop(plasmaCrawlBalancer balancer) {
+    private Entry pop(plasmaCrawlBalancer balancer) throws IOException {
         // this is a filo - pop
-        try {
-            if (balancer.size() > 0) {
-                Entry e = new Entry(new String((byte[]) balancer.get()[1]));
-                stackIndex.remove(e.hash);
-                return e;
-            } else {
-                return null;
-            }
-        } catch (IOException e) {
-            return null;
+        if (balancer.size() > 0) {
+            Entry e = new Entry(new String((byte[]) balancer.get()[1]));
+            stackIndex.remove(e.hash);
+            return e;
+        } else {
+            throw new IOException("balancer stack is empty");
         }
     }
 
@@ -335,32 +348,30 @@ public class plasmaCrawlNURL extends plasmaURL {
         // this is a filo - top
         if (count > stack.size()) count = stack.size();
         ArrayList list = new ArrayList(count);
-        try {
-            for (int i = 0; i < count; i++) {
+        for (int i = 0; i < count; i++) {
+            try {
                 byte[] hash = stack.top(i)[0];
-                if (hash == null) continue;
                 list.add(new Entry(new String(hash)));
+            } catch (IOException e) {
+                continue;
             }
-            return (Entry[])list.toArray(new Entry[list.size()]);
-        } catch (IOException e) {
-            return null;
         }
+        return (Entry[]) list.toArray(new Entry[list.size()]);
     }
 
     private Entry[] top(plasmaCrawlBalancer balancer, int count) {
         // this is a filo - top
         if (count > balancer.size()) count = balancer.size();
         ArrayList list = new ArrayList(count);
-        try {
             for (int i = 0; i < count; i++) {
-                byte[] hash = balancer.top(i);
-                if (hash == null) continue;
-                list.add(new Entry(new String(hash)));
+                try {
+                    byte[] hash = balancer.top(i);
+                    list.add(new Entry(new String(hash)));
+                } catch (IOException e) {
+                    continue;
+                }
             }
             return (Entry[])list.toArray(new Entry[list.size()]);
-        } catch (IOException e) {
-            return null;
-        }
     }
 
     public synchronized Entry getEntry(String hash) throws IOException {
@@ -460,7 +471,7 @@ public class plasmaCrawlNURL extends plasmaURL {
                 //}
             } else {
                 // show that we found nothing
-                throw new IOException("hash not found");
+                throw new IOException("NURL: hash " + hash + " not found");
                 //this.url = null;
             }
         }

source/de/anomic/plasma/plasmaSwitchboard.java

@@ -925,7 +925,6 @@ public final class plasmaSwitchboard extends serverAbstractSwitch implements ser
     }
     
     public boolean coreCrawlJob() {
-        try {
         if (urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) == 0) {
             //log.logDebug("CoreCrawl: queue is empty");
             return false;
@@ -958,46 +957,31 @@ public final class plasmaSwitchboard extends serverAbstractSwitch implements ser
         }
         
         // do a local crawl
-        String stats = null;
-        boolean validEntry = false;
+        String stats = "LOCALCRAWL[" + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_LIMIT) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_OVERHANG) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_REMOTE) + "]";
         plasmaCrawlNURL.Entry urlEntry = null;
-        do {
+        try {
             urlEntry = urlPool.noticeURL.pop(plasmaCrawlNURL.STACK_TYPE_CORE);
-            stats = "LOCALCRAWL[" + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_LIMIT) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_OVERHANG) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_REMOTE) + "]";
-            
-            // if the queue is empty
-            if (urlEntry == null) return false;
-            
-            // if we have received a new entry
-            if ((urlEntry.url() == null) || (urlEntry.url().toString().length() < 10)) {
-                log.logInfo(stats + ": URL with hash " + ((urlEntry.hash()==null)?"Unknown":urlEntry.hash()) + " already removed from queue.");
-                validEntry = false;
-            } else {
-                validEntry = true;
+            String profileHandle = urlEntry.profileHandle();
+            // System.out.println("DEBUG plasmaSwitchboard.processCrawling:
+            // profileHandle = " + profileHandle + ", urlEntry.url = " + urlEntry.url());
+            if (profileHandle == null) {
+                log.logSevere(stats + ": NULL PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
+                return true;
             }
-        } while(!validEntry);
-            
-        String profileHandle = urlEntry.profileHandle();
-        //System.out.println("DEBUG plasmaSwitchboard.processCrawling: profileHandle = " + profileHandle + ", urlEntry.url = " + urlEntry.url());
-        if (profileHandle == null) {
-            log.logSevere(stats + ": NULL PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
+            plasmaCrawlProfile.entry profile = profiles.getEntry(profileHandle);
+            if (profile == null) {
+                log.logSevere(stats + ": LOST PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
+                return true;
+            }
+            log.logFine("LOCALCRAWL: URL=" + urlEntry.url() + ", initiator=" + urlEntry.initiator() + ", crawlOrder=" + ((profile.remoteIndexing()) ? "true" : "false") + ", depth=" + urlEntry.depth() + ", crawlDepth=" + profile.generalDepth() + ", filter=" + profile.generalFilter()
+                        + ", permission=" + ((yacyCore.seedDB == null) ? "undefined" : (((yacyCore.seedDB.mySeed.isSenior()) || (yacyCore.seedDB.mySeed.isPrincipal())) ? "true" : "false")));
+
+            processLocalCrawling(urlEntry, profile, stats);
             return true;
-        }
-        plasmaCrawlProfile.entry profile = profiles.getEntry(profileHandle);
-        if (profile == null) {
-            log.logSevere(stats + ": LOST PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
+        } catch (IOException e) {
+            log.logSevere(stats + ": CANNOT FETCH ENTRY: " + e.getMessage());
             return true;
         }
-        log.logFine("LOCALCRAWL: URL=" + urlEntry.url() + ", initiator=" + urlEntry.initiator() +
-        ", crawlOrder=" + ((profile.remoteIndexing()) ? "true" : "false") + ", depth=" + urlEntry.depth() + ", crawlDepth=" + profile.generalDepth() + ", filter=" + profile.generalFilter() +
-        ", permission=" + ((yacyCore.seedDB == null) ? "undefined" : (((yacyCore.seedDB.mySeed.isSenior()) || (yacyCore.seedDB.mySeed.isPrincipal())) ? "true" : "false")));
-        
-        processLocalCrawling(urlEntry, profile, stats);
-        return true;
-        } catch (Exception e) {
-            e.printStackTrace();
-            return false;
-        }
     }
     
     public int limitCrawlTriggerJobSize() {
@@ -1049,37 +1033,37 @@ public final class plasmaSwitchboard extends serverAbstractSwitch implements ser
         }
         
         // start a global crawl, if possible
-        plasmaCrawlNURL.Entry urlEntry = urlPool.noticeURL.pop(plasmaCrawlNURL.STACK_TYPE_LIMIT);
-        String stats = "REMOTECRAWLTRIGGER[" + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_LIMIT) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_OVERHANG) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_REMOTE) + "]";
-        if (urlEntry.url() == null) {
-            log.logSevere(stats + ": urlEntry.url() == null");
-            return true;
-        }
-        String profileHandle = urlEntry.profileHandle();
-        //System.out.println("DEBUG plasmaSwitchboard.processCrawling: profileHandle = " + profileHandle + ", urlEntry.url = " + urlEntry.url());
-        plasmaCrawlProfile.entry profile = profiles.getEntry(profileHandle);
-        if (profile == null) {
-            log.logSevere(stats + ": LOST PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
+        String stats = "REMOTECRAWLTRIGGER[" + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_LIMIT) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_OVERHANG) + ", "
+                        + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_REMOTE) + "]";
+        try {
+            plasmaCrawlNURL.Entry urlEntry = urlPool.noticeURL.pop(plasmaCrawlNURL.STACK_TYPE_LIMIT);
+            String profileHandle = urlEntry.profileHandle();
+            // System.out.println("DEBUG plasmaSwitchboard.processCrawling:
+            // profileHandle = " + profileHandle + ", urlEntry.url = " + urlEntry.url());
+            plasmaCrawlProfile.entry profile = profiles.getEntry(profileHandle);
+            if (profile == null) {
+                log.logSevere(stats + ": LOST PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
+                return true;
+            }
+            log.logFine("plasmaSwitchboard.limitCrawlTriggerJob: url=" + urlEntry.url() + ", initiator=" + urlEntry.initiator() + ", crawlOrder=" + ((profile.remoteIndexing()) ? "true" : "false") + ", depth=" + urlEntry.depth() + ", crawlDepth=" + profile.generalDepth() + ", filter="
+                            + profile.generalFilter() + ", permission=" + ((yacyCore.seedDB == null) ? "undefined" : (((yacyCore.seedDB.mySeed.isSenior()) || (yacyCore.seedDB.mySeed.isPrincipal())) ? "true" : "false")));
+
+            boolean tryRemote = ((urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) != 0) || (sbQueue.size() != 0)) &&
+                                 (profile.remoteIndexing()) &&
+                                 (urlEntry.initiator() != null) &&
+                                 (!(urlEntry.initiator().equals(plasmaURL.dummyHash))) &&
+                                 ((yacyCore.seedDB.mySeed.isSenior()) || (yacyCore.seedDB.mySeed.isPrincipal()));
+            if (tryRemote) {
+                boolean success = processRemoteCrawlTrigger(urlEntry);
+                if (success) return true;
+            }
+
+            processLocalCrawling(urlEntry, profile, stats);
             return true;
+        } catch (IOException e) {
+            log.logSevere(stats + ": CANNOT FETCH ENTRY: " + e.getMessage());
+            return true; // if we return a false here we will block everything
         }
-        log.logFine("plasmaSwitchboard.limitCrawlTriggerJob: url=" + urlEntry.url() + ", initiator=" + urlEntry.initiator() +
-        ", crawlOrder=" + ((profile.remoteIndexing()) ? "true" : "false") + ", depth=" + urlEntry.depth() + ", crawlDepth=" + profile.generalDepth() + ", filter=" + profile.generalFilter() +
-        ", permission=" + ((yacyCore.seedDB == null) ? "undefined" : (((yacyCore.seedDB.mySeed.isSenior()) || (yacyCore.seedDB.mySeed.isPrincipal())) ? "true" : "false")));
-        
-        boolean tryRemote =
-        ((urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) != 0) || (sbQueue.size() != 0)) /* should do ourself */ &&
-        (profile.remoteIndexing()) /* granted */ &&
-        (urlEntry.initiator() != null) && (!(urlEntry.initiator().equals(plasmaURL.dummyHash))) /* not proxy */ &&
-        ((yacyCore.seedDB.mySeed.isSenior()) ||
-        (yacyCore.seedDB.mySeed.isPrincipal())) /* qualified */;
-        
-        if (tryRemote) {
-            boolean success = processRemoteCrawlTrigger(urlEntry);
-            if (success) return true;
-        }
-        
-        processLocalCrawling(urlEntry, profile, stats);
-        return true;
     }
     
     public int remoteTriggeredCrawlJobSize() {
@@ -1111,26 +1095,29 @@ public final class plasmaSwitchboard extends serverAbstractSwitch implements ser
         }
         
         // we don't want to crawl a global URL globally, since WE are the global part. (from this point of view)
-        plasmaCrawlNURL.Entry urlEntry = urlPool.noticeURL.pop(plasmaCrawlNURL.STACK_TYPE_REMOTE);
-        String stats = "REMOTETRIGGEREDCRAWL[" + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_LIMIT) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_OVERHANG) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_REMOTE) + "]";
-        if (urlEntry.url() == null) {
-            log.logSevere(stats + ": urlEntry.url() == null");
-            return false;
-        }
-        String profileHandle = urlEntry.profileHandle();
-        //System.out.println("DEBUG plasmaSwitchboard.processCrawling: profileHandle = " + profileHandle + ", urlEntry.url = " + urlEntry.url());
-        plasmaCrawlProfile.entry profile = profiles.getEntry(profileHandle);
-        
-        if (profile == null) {
-            log.logSevere(stats + ": LOST PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
-            return false;
+        String stats = "REMOTETRIGGEREDCRAWL[" + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_LIMIT) + ", " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_OVERHANG) + ", "
+                        + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_REMOTE) + "]";
+        try {
+            plasmaCrawlNURL.Entry urlEntry = urlPool.noticeURL.pop(plasmaCrawlNURL.STACK_TYPE_REMOTE);
+            String profileHandle = urlEntry.profileHandle();
+            // System.out.println("DEBUG plasmaSwitchboard.processCrawling:
+            // profileHandle = " + profileHandle + ", urlEntry.url = " +
+            // urlEntry.url());
+            plasmaCrawlProfile.entry profile = profiles.getEntry(profileHandle);
+
+            if (profile == null) {
+                log.logSevere(stats + ": LOST PROFILE HANDLE '" + urlEntry.profileHandle() + "' (must be internal error) for URL " + urlEntry.url());
+                return false;
+            }
+            log.logFine("plasmaSwitchboard.remoteTriggeredCrawlJob: url=" + urlEntry.url() + ", initiator=" + urlEntry.initiator() + ", crawlOrder=" + ((profile.remoteIndexing()) ? "true" : "false") + ", depth=" + urlEntry.depth() + ", crawlDepth=" + profile.generalDepth() + ", filter="
+                        + profile.generalFilter() + ", permission=" + ((yacyCore.seedDB == null) ? "undefined" : (((yacyCore.seedDB.mySeed.isSenior()) || (yacyCore.seedDB.mySeed.isPrincipal())) ? "true" : "false")));
+
+            processLocalCrawling(urlEntry, profile, stats);
+            return true;
+        } catch (IOException e) {
+            log.logSevere(stats + ": CANNOT FETCH ENTRY: " + e.getMessage());
+            return true;
         }
-        log.logFine("plasmaSwitchboard.remoteTriggeredCrawlJob: url=" + urlEntry.url() + ", initiator=" + urlEntry.initiator() +
-        ", crawlOrder=" + ((profile.remoteIndexing()) ? "true" : "false") + ", depth=" + urlEntry.depth() + ", crawlDepth=" + profile.generalDepth() + ", filter=" + profile.generalFilter() +
-        ", permission=" + ((yacyCore.seedDB == null) ? "undefined" : (((yacyCore.seedDB.mySeed.isSenior()) || (yacyCore.seedDB.mySeed.isPrincipal())) ? "true" : "false")));
-        
-        processLocalCrawling(urlEntry, profile, stats);
-        return true;
     }
     
     private void processResourceStack(plasmaSwitchboardQueue.Entry entry) {
@@ -1219,14 +1206,12 @@ public final class plasmaSwitchboard extends serverAbstractSwitch implements ser
                     nexturlstring = htmlFilterContentScraper.urlNormalform(null, nexturlstring);
                     
                     sbStackCrawlThread.enqueue(nexturlstring, entry.url().toString(), initiatorHash, (String) e.getValue(), docDate, entry.depth() + 1, entry.profile());
-                    
-                    //                    rejectReason = stackCrawl(nexturlstring, entry.normalizedURLString(), initiatorHash, (String) e.getValue(), loadDate, entry.depth() + 1, entry.profile());
-                    //                    if (rejectReason == null) {
-                    //                        c++;
-                    //                    } else {
-                    //                        urlPool.errorURL.newEntry(new URL(nexturlstring), entry.normalizedURLString(), entry.initiator(), yacyCore.seedDB.mySeed.hash,
-                    //				       (String) e.getValue(), rejectReason, new bitfield(plasmaURL.urlFlagLength), false);
-                    //                    }
+
+                    // rejectReason = stackCrawl(nexturlstring, entry.normalizedURLString(), initiatorHash, (String) e.getValue(), loadDate, entry.depth() + 1, entry.profile());
+                    // if (rejectReason == null) { c++; } else {
+                    //     urlPool.errorURL.newEntry(new URL(nexturlstring), entry.normalizedURLString(), entry.initiator(), yacyCore.seedDB.mySeed.hash,
+                    //     (String) e.getValue(), rejectReason, new bitfield(plasmaURL.urlFlagLength), false);
+                    // }
                 }
                 log.logInfo("CRAWL: ADDED " + hl.size() + " LINKS FROM " + entry.normalizedURLString() +
                         ", NEW CRAWL STACK SIZE IS " + urlPool.noticeURL.stackSize(plasmaCrawlNURL.STACK_TYPE_CORE));