- added writing of temporary file names and renaming to final file name when index dump/merge are done. Interrupted merges can be cleaned up.

- added clean-up of unfinished merges and unused idx/gap files
- enhanced merge file selection method

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5764 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/crawler/Balancer.java

@@ -582,7 +582,7 @@ public class Balancer {
             // in best case, this should never happen if the balancer works propertly
             // this is only to protection against the worst case, where the crawler could
             // behave in a DoS-manner
-            Log.logInfo("BALANCER", "forcing crawl-delay of " + sleeptime + " milliseconds for " + crawlEntry.url().getHost() + ((sleeptime > Math.max(minimumLocalDelta, minimumGlobalDelta)) ? " (caused by robots.txt)" : ""));
+            Log.logInfo("BALANCER", "forcing crawl-delay of " + sleeptime + " milliseconds for " + crawlEntry.url().getHost() + ((sleeptime > Math.max(minimumLocalDelta, minimumGlobalDelta)) ? " (forced latency)" : ""));
             if (System.currentTimeMillis() - this.lastPrepare > 10000) {
                 long t = System.currentTimeMillis();
                 prepare(400);

source/de/anomic/crawler/CrawlEntry.java

@@ -159,6 +159,7 @@ public class CrawlEntry extends serverProcessorJob {
     }
     
     public void setStatus(final String s, int code) {
+        //System.out.println("***DEBUG*** crawler status " + s + ", " + code + " for " + this.url.toNormalform(true, false));
         this.statusMessage = s;
         this.status = code;
     }

source/de/anomic/kelondro/blob/BLOBArray.java

@@ -31,6 +31,7 @@ import java.io.IOException;
 import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.Date;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.TreeMap;
@@ -97,12 +98,31 @@ public class BLOBArray implements BLOB {
 
         // register all blob files inside this directory
         String[] files = heapLocation.list();
+        HashSet<String> fh = new HashSet<String>();
+        for (int i = 0; i < files.length; i++) fh.add(files[i]);
+        // delete unused temporary files
+        boolean deletions = false;
+        for (int i = 0; i < files.length; i++) {
+            if (files[i].endsWith(".tmp")) {
+                FileUtils.deletedelete(new File(heapLocation, files[i]));
+                deletions = true;
+            }
+            if (files[i].endsWith(".idx") || files[i].endsWith(".gap")) {
+                String s = files[i].substring(0, files[i].length() - 17);
+                if (!fh.contains(s)) {
+                    FileUtils.deletedelete(new File(heapLocation, files[i]));
+                    deletions = true;
+                }
+            }
+        }
+        if (deletions) files = heapLocation.list(); // make a fresh list
+        
+        // find maximum time: the file with this time will be given a write buffer
         Date d;
         TreeMap<Long, blobItem> sortedItems = new TreeMap<Long, blobItem>();
         BLOB oneBlob;
         File f;
         long time, maxtime = 0;
-        // first find maximum time: the file with this time will be given a write buffer
         for (int i = 0; i < files.length; i++) {
             if (files[i].length() >= 19 && files[i].endsWith(".blob")) {
                try {

source/de/anomic/kelondro/blob/BLOBHeapModifier.java

@@ -112,10 +112,11 @@ public class BLOBHeapModifier extends HeapReader implements BLOB {
             // to speed up the next start
             try {
                 long start = System.currentTimeMillis();
-                free.dump(HeapWriter.fingerprintGapFile(this.heapFile));
+                String fingerprint = HeapWriter.fingerprintFileHash(this.heapFile);
+                free.dump(HeapWriter.fingerprintGapFile(this.heapFile, fingerprint));
                 free.clear();
                 free = null;
-                index.dump(HeapWriter.fingerprintIndexFile(this.heapFile));
+                index.dump(HeapWriter.fingerprintIndexFile(this.heapFile, fingerprint));
                 Log.logInfo("kelondroBLOBHeap", "wrote a dump for the " + this.index.size() +  " index entries of " + heapFile.getName()+ " in " + (System.currentTimeMillis() - start) + " milliseconds.");
                 index.close();
                 index = null;

source/de/anomic/kelondro/blob/Gap.java

@@ -84,8 +84,9 @@ public class Gap extends TreeMap<Long, Integer> {
      * @throws IOException
      */
     public int dump(File file) throws IOException {
+        File tmp = new File(file.getParentFile(), file.getName() + ".tmp");
         Iterator<Map.Entry<Long, Integer>> i = this.entrySet().iterator();
-        DataOutputStream os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file), 4 * 1024 * 1024));
+        DataOutputStream os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(tmp), 4 * 1024 * 1024));
         int c = 0;
         Map.Entry<Long, Integer> e;
         while (i.hasNext()) {
@@ -96,6 +97,10 @@ public class Gap extends TreeMap<Long, Integer> {
         }
         os.flush();
         os.close();
+        tmp.renameTo(file);
+        assert file.exists() : file.toString();
+        assert !tmp.exists() : tmp.toString();
+        
         return c;
     }
 

source/de/anomic/kelondro/blob/HeapReader.java

@@ -64,7 +64,7 @@ public class HeapReader {
         this.file = new CachedRandomAccess(heapFile);
         
         // read or initialize the index
-        if (initIndexReadDump(heapFile)) {
+        if (initIndexReadDump()) {
             // verify that everything worked just fine
             // pick some elements of the index
             Iterator<byte[]> i = this.index.keys(true, null);
@@ -94,13 +94,14 @@ public class HeapReader {
         }
     }
     
-    private boolean initIndexReadDump(File f) {
+    private boolean initIndexReadDump() {
         // look for an index dump and read it if it exist
         // if this is successfull, return true; otherwise false
-        File fif = HeapWriter.fingerprintIndexFile(f);
-        File fgf = HeapWriter.fingerprintGapFile(f);
+        String fingerprint = HeapWriter.fingerprintFileHash(this.heapFile);
+        File fif = HeapWriter.fingerprintIndexFile(this.heapFile, fingerprint);
+        File fgf = HeapWriter.fingerprintGapFile(this.heapFile, fingerprint);
         if (!fif.exists() || !fgf.exists()) {
-            HeapWriter.deleteAllFingerprints(f);
+            HeapWriter.deleteAllFingerprints(this.heapFile);
             return false;
         }
         

source/de/anomic/kelondro/blob/HeapWriter.java

@@ -40,7 +40,8 @@ public final class HeapWriter  {
 
     private int                keylength;     // the length of the primary key
     private LongHandleIndex    index;         // key/seek relation for used records
-    private final File         heapFile;   // the file of the heap
+    private final File         heapFileTMP;   // the temporary file of the heap during writing
+    private final File         heapFileREADY; // the final file of the heap when the file is closed
     private DataOutputStream   os;            // the output stream where the BLOB is written
     private long               seek;          // the current write position
     //private HashSet<String>    doublecheck;// only for testing
@@ -65,16 +66,18 @@ public final class HeapWriter  {
     /**
      * create a heap file: a arbitrary number of BLOBs, indexed by an access key
      * The heap file will be indexed upon initialization.
-     * @param heapFile
+     * @param temporaryHeapFile
+     * @param readyHeapFile
      * @param keylength
      * @param ordering
      * @throws IOException
      */
-    public HeapWriter(final File heapFile, final int keylength, final ByteOrder ordering) throws IOException {
-        this.heapFile = heapFile;
+    public HeapWriter(final File temporaryHeapFile, final File readyHeapFile, final int keylength, final ByteOrder ordering) throws IOException {
+        this.heapFileTMP = temporaryHeapFile;
+        this.heapFileREADY = readyHeapFile;
         this.keylength = keylength;
         this.index = new LongHandleIndex(keylength, ordering, 10, 100000);
-        this.os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(heapFile), 8 * 1024 * 1024));
+        this.os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(temporaryHeapFile), 8 * 1024 * 1024));
         //this.doublecheck = new HashSet<String>();
         this.seek = 0;
     }
@@ -91,7 +94,7 @@ public final class HeapWriter  {
         assert blob.length > 0;
         assert key.length == this.keylength;
         assert index.row().primaryKeyLength == key.length : index.row().primaryKeyLength + "!=" + key.length;
-        assert index.get(key) < 0 : "index.get(key) = " + index.get(key) + ", index.size() = " + index.size() + ", file.length() = " + this.heapFile.length() +  ", key = " + new String(key); // must not occur before
+        assert index.get(key) < 0 : "index.get(key) = " + index.get(key) + ", index.size() = " + index.size() + ", file.length() = " + this.heapFileTMP.length() +  ", key = " + new String(key); // must not occur before
         if ((blob == null) || (blob.length == 0)) return;
         int chunkl = key.length + blob.length;
         os.writeInt(chunkl);
@@ -102,18 +105,19 @@ public final class HeapWriter  {
         this.seek += chunkl + 4;
     }
     
-    protected static File fingerprintIndexFile(File f) {
+    protected static File fingerprintIndexFile(File f, String fingerprint) {
         assert f != null;
-        return new File(f.getParentFile(), f.getName() + "." + fingerprintFileHash(f) + ".idx");
+        return new File(f.getParentFile(), f.getName() + "." + fingerprint + ".idx");
     }
     
-    protected static File fingerprintGapFile(File f) {
+    protected static File fingerprintGapFile(File f, String fingerprint) {
         assert f != null;
-        return new File(f.getParentFile(), f.getName() + "." + fingerprintFileHash(f) + ".gap");
+        return new File(f.getParentFile(), f.getName() + "." + fingerprint + ".gap");
     }
     
     protected static String fingerprintFileHash(File f) {
         assert f != null;
+        assert f.exists() : "file = " + f.toString();
         String fp = Digest.fastFingerprintB64(f, false);
         assert fp != null : "file = " + f.toString();
         return fp.substring(0, 12);
@@ -133,6 +137,7 @@ public final class HeapWriter  {
      * @throws  
      */
     public synchronized void close(boolean writeIDX) {
+        // close the file
         try {
             os.flush();
             os.close();
@@ -141,14 +146,21 @@ public final class HeapWriter  {
         }
         os = null;
         
+        // rename the file into final name
+        this.heapFileTMP.renameTo(this.heapFileREADY);
+        assert this.heapFileREADY.exists() : this.heapFileREADY.toString();
+        assert !this.heapFileTMP.exists() : this.heapFileTMP.toString();
+        
+        // generate index and gap files
         if (writeIDX && index.size() > 3) {
             // now we can create a dump of the index and the gap information
             // to speed up the next start
             try {
                 long start = System.currentTimeMillis();
-                new Gap().dump(fingerprintGapFile(this.heapFile));
-                index.dump(fingerprintIndexFile(this.heapFile));
-                Log.logInfo("kelondroBLOBHeapWriter", "wrote a dump for the " + this.index.size() +  " index entries of " + heapFile.getName()+ " in " + (System.currentTimeMillis() - start) + " milliseconds.");
+                String fingerprint = HeapWriter.fingerprintFileHash(this.heapFileREADY);
+                new Gap().dump(fingerprintGapFile(this.heapFileREADY, fingerprint));
+                index.dump(fingerprintIndexFile(this.heapFileREADY, fingerprint));
+                Log.logInfo("kelondroBLOBHeapWriter", "wrote a dump for the " + this.index.size() +  " index entries of " + heapFileREADY.getName()+ " in " + (System.currentTimeMillis() - start) + " milliseconds.");
                 index.close();
                 index = null;
             } catch (IOException e) {

source/de/anomic/kelondro/index/LongHandleIndex.java

@@ -98,8 +98,9 @@ public class LongHandleIndex {
         // we must use an iterator from the combined index, because we need the entries sorted
         // otherwise we could just write the byte[] from the in kelondroRowSet which would make
         // everything much faster, but this is not an option here.
+        File tmp = new File(file.getParentFile(), file.getName() + ".tmp");
         Iterator<Row.Entry> i = this.index.rows(true, null);
-        OutputStream os = new BufferedOutputStream(new FileOutputStream(file), 4 * 1024 * 1024);
+        OutputStream os = new BufferedOutputStream(new FileOutputStream(tmp), 4 * 1024 * 1024);
         int c = 0;
         while (i.hasNext()) {
             os.write(i.next().bytes());
@@ -107,6 +108,9 @@ public class LongHandleIndex {
         }
         os.flush();
         os.close();
+        tmp.renameTo(file);
+        assert file.exists() : file.toString();
+        assert !tmp.exists() : tmp.toString();
         return c;
     }
 

source/de/anomic/kelondro/text/IODispatcher.java

@@ -239,7 +239,8 @@ public class IODispatcher extends Thread {
         }
         assert i1.hasNext();
         assert i2.hasNext();
-        HeapWriter writer = new HeapWriter(newFile, array.keylength(), array.ordering());
+        File tmpFile = new File(newFile.getParentFile(), newFile.getName() + ".tmp");
+        HeapWriter writer = new HeapWriter(tmpFile, newFile, array.keylength(), array.ordering());
         merge(i1, i2, array.ordering(), writer);
         writer.close(true);
         // we don't need the old files any more

source/de/anomic/kelondro/text/IndexCell.java

@@ -80,7 +80,7 @@ public final class IndexCell extends AbstractBufferedIndex implements BufferedIn
         this.lastCleanup = System.currentTimeMillis();
         this.targetFileSize = targetFileSize;
         this.maxFileSize = maxFileSize;
-        cacheCleanup();
+        cleanCache();
     }
 
     
@@ -96,15 +96,13 @@ public final class IndexCell extends AbstractBufferedIndex implements BufferedIn
     public synchronized void add(ReferenceContainer newEntries) throws IOException {
         this.ram.add(newEntries);
         serverProfiling.update("wordcache", Long.valueOf(this.ram.size()), true);
-        cacheDumpIfNecessary();
-        cacheCleanup();
+        cleanCache();
     }
 
     public synchronized void add(String hash, ReferenceRow entry) throws IOException {
         this.ram.add(hash, entry);
         serverProfiling.update("wordcache", Long.valueOf(this.ram.size()), true);
-        cacheDumpIfNecessary();
-        cacheCleanup();
+        cleanCache();
     }
 
     /**
@@ -159,7 +157,7 @@ public final class IndexCell extends AbstractBufferedIndex implements BufferedIn
             return c0;
         }
         this.array.delete(wordHash);
-        cacheCleanup();
+        cleanCache();
         if (c0 == null) return c1;
         return c1.merge(c0);
     }
@@ -274,14 +272,20 @@ public final class IndexCell extends AbstractBufferedIndex implements BufferedIn
      * cache control methods
      */
     
-    private synchronized void cacheDumpIfNecessary() {
-        if (this.ram.size() > this.maxRamEntries || MemoryControl.available() < 20 * 1024 * 1024) {
+    private synchronized void cleanCache() {
+        // dump the cache if necessary
+        if (this.ram.size() > this.maxRamEntries || (this.ram.size() > 3000 && MemoryControl.available() < 50 * 1024 * 1024)) {
             try {
                 cacheDump();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
+        
+        // clean-up the cache
+        if (this.lastCleanup + cleanupCycle > System.currentTimeMillis()) return;
+        this.array.shrink(this.targetFileSize, this.maxFileSize);
+        this.lastCleanup = System.currentTimeMillis();
     }
 
     private synchronized void cacheDump() throws IOException {
@@ -295,12 +299,6 @@ public final class IndexCell extends AbstractBufferedIndex implements BufferedIn
         this.ram.initWriteMode();
     }
     
-    private synchronized void cacheCleanup() throws IOException {
-        if (this.lastCleanup + cleanupCycle > System.currentTimeMillis()) return;
-        this.array.shrink(this.targetFileSize, this.maxFileSize);
-        this.lastCleanup = System.currentTimeMillis();
-    }
-
     public File newContainerBLOBFile() {
         // for migration of cache files
         return this.array.newContainerBLOBFile();
@@ -315,12 +313,10 @@ public final class IndexCell extends AbstractBufferedIndex implements BufferedIn
         // do nothing
     }
 
-
     public int getBackendSize() {
         return this.array.size();
     }
 
-
     public long getBufferMaxAge() {
         return System.currentTimeMillis();
     }

source/de/anomic/kelondro/text/ReferenceContainerArray.java

@@ -245,32 +245,38 @@ public final class ReferenceContainerArray {
         return this.array.entries();
     }
     
-    public synchronized boolean shrink(long targetFileSize, long maxFileSize) throws IOException {
+    public synchronized boolean shrink(long targetFileSize, long maxFileSize) {
         if (this.array.entries() < 2) return false;
-        if (this.merger.queueLength() > 0) return false;
+        boolean donesomething = false;
         
+        // first try to merge small files that match
+        while (this.merger.queueLength() < 3) {
             File[] ff = this.array.unmountBestMatch(2.0, targetFileSize);
-        if (ff != null) {
-            Log.logInfo("RICELL-shrink", "doing unmountBestMatch(2.0, " + targetFileSize + ")");
+            if (ff == null) break;
+            Log.logInfo("RICELL-shrink", "unmountBestMatch(2.0, " + targetFileSize + ")");
             merger.merge(ff[0], ff[1], this.array, this.payloadrow, newContainerBLOBFile());
-            return true;
+            donesomething = true;
         }
         
-        ff = this.array.unmountSmallest(targetFileSize);
-        if (ff != null) {
-            Log.logInfo("RICELL-shrink", "doing unmountSmallest(" + targetFileSize + ")");
+        // then try to merge simply any small file
+        while (this.merger.queueLength() < 2) {
+            File[] ff = this.array.unmountSmallest(targetFileSize);
+            if (ff == null) break;
+            Log.logInfo("RICELL-shrink", "unmountSmallest(" + targetFileSize + ")");
             merger.merge(ff[0], ff[1], this.array, this.payloadrow, newContainerBLOBFile());
-            return true;
+            donesomething = true;
         }
         
-        ff = this.array.unmountBestMatch(2.0, maxFileSize);
-        if (ff != null) {
-            Log.logInfo("RICELL-shrink", "doing unmountBestMatch(2.0, " + maxFileSize + ")");
+        // if there is no small file, then merge matching files up to limit
+        while (this.merger.queueLength() < 1) {
+            File[] ff = this.array.unmountBestMatch(2.0, maxFileSize);
+            if (ff == null) break;
+            Log.logInfo("RICELL-shrink", "unmountBestMatch(2.0, " + maxFileSize + ")");
             merger.merge(ff[0], ff[1], this.array, this.payloadrow, newContainerBLOBFile());
-            return true;
+            donesomething = true;
         }
 
-        return false;
+        return donesomething;
     }
     
     

source/de/anomic/kelondro/text/ReferenceContainerCache.java

@@ -114,7 +114,8 @@ public final class ReferenceContainerCache extends AbstractIndex implements Inde
         assert this.cache != null;
         Log.logInfo("indexContainerRAMHeap", "creating rwi heap dump '" + heapFile.getName() + "', " + cache.size() + " rwi's");
         if (heapFile.exists()) FileUtils.deletedelete(heapFile);
-        HeapWriter dump = new HeapWriter(heapFile, payloadrow.primaryKeyLength, Base64Order.enhancedCoder);
+        File tmpFile = new File(heapFile.getParentFile(), heapFile.getName() + ".tmp");
+        HeapWriter dump = new HeapWriter(tmpFile, heapFile, payloadrow.primaryKeyLength, Base64Order.enhancedCoder);
         final long startTime = System.currentTimeMillis();
         long wordcount = 0, urlcount = 0;
         String wordHash = null, lwh;