option to disable dht by memory limit:

memory.acceptDHT in kbytes
not yet pre-enabled, will clear on every startup
please review since this could break dht in freeworld

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6459 6c8d7289-2bf4-0310-a012-ef5d649a1542

defaults/yacy.init

@@ -899,6 +899,9 @@ disk.free = 3000
 # minimum for DHT or 1/5th of former, whatever is max
 disk.free.hardlimit = 1000
 
+# minimum memory to accept dht-in (KB)
+#memory.acceptDHT = 10000
+
 # setting if execution of CGI files is allowed or not
 cgi.allow = false
 cgi.suffixes = cgi,pl

source/de/anomic/crawler/ResourceObserver.java

@@ -30,6 +30,7 @@ import java.util.Map;
 
 import net.yacy.kelondro.logging.Log;
 import net.yacy.kelondro.util.DiskSpace;
+import net.yacy.kelondro.util.MemoryControl;
 
 import de.anomic.search.Switchboard;
 import de.anomic.search.SwitchboardConstants;
@@ -105,6 +106,8 @@ public final class ResourceObserver {
      * checks the resources and pauses crawls if necessary
      */
     public void resourceObserverJob() {
+    	MemoryControl.setDHTkbytes(sb.getConfigLong(SwitchboardConstants.MEMORY_ACCEPTDHT, 0));
+    	
         checkDiskUsageCount++;
         checkMemoryUsageCount++;
         int tmpDisksFree = HIGH;
@@ -121,15 +124,15 @@ public final class ResourceObserver {
         }
         
         if (tmpDisksFree < HIGH || tmpMemoryFree < HIGH) {
-            if (!sb.crawlJobIsPaused(SwitchboardConstants.CRAWLJOB_LOCAL_CRAWL)) {
+            if (tmpDisksFree < HIGH && !sb.crawlJobIsPaused(SwitchboardConstants.CRAWLJOB_LOCAL_CRAWL)) {
                 log.logInfo("pausing local crawls");
                 sb.pauseCrawlJob(SwitchboardConstants.CRAWLJOB_LOCAL_CRAWL);
             }
-            if (!sb.crawlJobIsPaused(SwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL)) {
+            if (tmpDisksFree < HIGH && !sb.crawlJobIsPaused(SwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL)) {
                 log.logInfo("pausing remote triggered crawls");
                 sb.pauseCrawlJob(SwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL);
             }
-            if (tmpDisksFree == LOW && sb.getConfigBool(SwitchboardConstants.INDEX_RECEIVE_ALLOW, false)) {
+            if ((tmpDisksFree == LOW || tmpMemoryFree < HIGH) && sb.getConfigBool(SwitchboardConstants.INDEX_RECEIVE_ALLOW, false)) {
             	log.logInfo("disabling index receive");
                 sb.setConfig(SwitchboardConstants.INDEX_RECEIVE_ALLOW, false);
                 sb.peers.mySeed().setFlagAcceptRemoteIndex(false);
@@ -176,7 +179,7 @@ public final class ResourceObserver {
      * @return <ul>
      * <li><code>HIGH</code> if disk space is available</li>
      * <li><code>MEDIUM</code> if low disk space is available</li>
-     * <li><code>LOW</code> if lower than 100MB or 1/5 disk space is available</li>
+     * <li><code>LOW</code> if lower than hardlimit or 1/5 disk space is available (the max)</li>
      * </ul>
      */
     private int checkDisks() {
@@ -202,6 +205,7 @@ public final class ResourceObserver {
     }
     
     private int checkMemory() {
+    	if(!MemoryControl.getDHTallowed()) return LOW;
         return HIGH;
     }
 }

source/de/anomic/search/SwitchboardConstants.java

@@ -392,6 +392,7 @@ public final class SwitchboardConstants {
     public static final String DISK_FREE = "disk.free";
     public static final String DISK_FREE_HARDLIMIT = "disk.free.hardlimit";
     
+    public static final String MEMORY_ACCEPTDHT = "memory.acceptDHT";
     
     /*
      * Some constants

source/net/yacy/kelondro/util/MemoryControl.java

@@ -43,6 +43,9 @@ public class MemoryControl {
 
     private static long lastGC = 0l;
     
+    private static long DHTkbytes = 0;
+    private static boolean allowDHT = true;
+
     /**
      * Runs the garbage collector if last garbage collection is more than last millis ago
      * @param last time which must be passed since lased gc
@@ -154,6 +157,7 @@ public class MemoryControl {
                     + " KB (requested/available/average: "
                     + (size >> 10) + " / " + (avail >> 10) + " / " + (avg >> 10) + " KB)");
             }
+            checkDHTrule(avail);
             return avail >= size;
         } else {
             if (log.isFine()) log.logFine("former GCs indicate to not be able to free enough memory (requested/available/average: "
@@ -170,6 +174,18 @@ public class MemoryControl {
         return total() - free();
     }
         
+    public static boolean getDHTallowed() {
+    	return allowDHT;
+    }
+    
+    public static void setDHTkbytes(long kbytes) {
+    	DHTkbytes = kbytes;
+    }
+    
+    private static void checkDHTrule(long available) {
+        if ((available >> 10) < DHTkbytes) allowDHT = false;
+    }
+
     /**
      * main
      * @param args