mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-21 00:00:13 +02:00
19dbed7cc8
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@401 6c8d7289-2bf4-0310-a012-ef5d649a1542
255 lines
11 KiB
Java
255 lines
11 KiB
Java
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package de.anomic.plasma;
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import java.io.IOException;
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import java.util.Enumeration;
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import java.util.Vector;
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import java.util.Iterator;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacySeed;
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import de.anomic.yacy.yacySeedDB;
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import de.anomic.yacy.yacyClient;
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import de.anomic.server.serverCodings;
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import de.anomic.server.logging.serverLog;
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import de.anomic.kelondro.kelondroException;
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public class plasmaWordIndexDistribution {
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// distributes parts of the index to other peers
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// stops as soon as an error occurrs
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private int indexCount;
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private int peerCount;
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private long maxTime;
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private plasmaURLPool urlPool;
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private plasmaWordIndex wordIndex;
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private serverLog log;
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private boolean enabled;
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public plasmaWordIndexDistribution(plasmaURLPool urlPool, plasmaWordIndex wordIndex, serverLog log,
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boolean enable) {
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this.urlPool = urlPool;
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this.wordIndex = wordIndex;
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setCounts(100 /*indexCount*/, 1 /*peerCount*/, 8000);
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}
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public void enable() {
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enabled = true;
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}
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public void disable() {
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enabled = false;
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}
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public boolean job() {
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if ((yacyCore.seedDB == null) ||
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(yacyCore.seedDB.mySeed == null) ||
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(yacyCore.seedDB.mySeed.isVirgin()) ||
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(urlPool.loadedURL.size() < 10) ||
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(wordIndex.size() < 100) ||
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(!(yacyCore.seedDB.mySeed.isJunior()))) return false;
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int transferred;
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long starttime = System.currentTimeMillis();
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try {
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if (
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(urlPool.noticeURL.stackSize() == 0) &&
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(enabled) &&
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((transferred = performTransferIndex(indexCount, peerCount, true)) > 0)) {
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indexCount = transferred;
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if ((System.currentTimeMillis() - starttime) > (maxTime * peerCount)) indexCount--; else indexCount++;
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if (indexCount < 30) indexCount = 30;
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return true;
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} else {
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// make a long pause
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return false;
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}
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} catch (IllegalArgumentException ee) {
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// this is a bug that occurres if a not-fixeable data-inconsistency in the table structure was detected
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// make a long pause
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log.logError("very bad data inconsistency: " + ee.getMessage());
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//ee.printStackTrace();
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return false;
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}
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}
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public void setCounts(int indexCount, int peerCount, long maxTimePerTransfer) {
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this.maxTime = maxTimePerTransfer;
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this.indexCount = indexCount;
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if (indexCount < 30) indexCount = 30;
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this.peerCount = peerCount;
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}
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public int performTransferIndex(int indexCount, int peerCount, boolean delete) {
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if ((yacyCore.seedDB == null) || (yacyCore.seedDB.sizeConnected() == 0)) return -1;
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// collect index
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//String startPointHash = yacyCore.seedCache.mySeed.hash;
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String startPointHash = serverCodings.encodeMD5B64("" + System.currentTimeMillis(), true).substring(0, yacySeedDB.commonHashLength);
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plasmaWordIndexEntity[] indexEntities = selectTransferIndexes(startPointHash, indexCount);
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if ((indexEntities == null) || (indexEntities.length == 0)) {
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log.logDebug("No Index available for Index Transfer, hash start-point " + startPointHash);
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return -1;
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}
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// count the indexes again, can be smaller as expected
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indexCount = 0; for (int i = 0; i < indexEntities.length; i++) indexCount += indexEntities[i].size();
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// find start point for DHT-selection
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String keyhash = indexEntities[indexEntities.length - 1].wordHash();
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// iterate over DHT-peers and send away the indexes
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yacySeed seed;
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int hc = 0;
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Enumeration e = yacyCore.dhtAgent.getAcceptRemoteIndexSeeds(keyhash);
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String error;
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String peerNames = "";
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while ((e.hasMoreElements()) && (hc < peerCount)) {
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seed = (yacySeed) e.nextElement();
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if (seed != null) {
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error = yacyClient.transferIndex(seed, indexEntities, urlPool.loadedURL);
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if (error == null) {
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log.logInfo("Index Transfer of " + indexCount + " words [" + indexEntities[0].wordHash() + " .. " + indexEntities[indexEntities.length-1].wordHash() + "] to peer " + seed.getName() + ":" + seed.hash + " successfull");
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peerNames += ", " + seed.getName();
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hc++;
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} else {
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log.logWarning("Index Transfer to peer " + seed.getName() + ":" + seed.hash + " failed:'" + error + "', disconnecting peer");
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yacyCore.peerActions.peerDeparture(seed);
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}
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}
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}
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if (peerNames.length() > 0) peerNames = peerNames.substring(2); // remove comma
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// clean up and finish with deletion of indexes
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if (hc >= peerCount) {
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// success
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if (delete) {
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try {
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if (deleteTransferIndexes(indexEntities)) {
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log.logDebug("Deleted all transferred whole-word indexes locally");
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return indexCount;
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} else {
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log.logError("Deleted not all transferred whole-word indexes");
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return -1;
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}
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} catch (IOException ee) {
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log.logError("Deletion of Indexes not possible:" + ee.getMessage());
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ee.printStackTrace();
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return -1;
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}
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} else {
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// simply close the indexEntities
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for (int i = 0; i < indexEntities.length; i++) try {
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indexEntities[i].close();
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} catch (IOException ee) {}
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}
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return indexCount;
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} else {
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log.logError("Index distribution failed. Too less peers (" + hc + ") received the index, not deleted locally.");
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return -1;
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}
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}
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private plasmaWordIndexEntity[] selectTransferIndexes(String hash, int count) {
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Vector tmpEntities = new Vector();
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String nexthash = "";
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try {
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Iterator wordHashIterator = wordIndex.wordHashes(hash, true, true);
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plasmaWordIndexEntity indexEntity, tmpEntity;
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Enumeration urlEnum;
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plasmaWordIndexEntry indexEntry;
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while ((count > 0) && (wordHashIterator.hasNext()) &&
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((nexthash = (String) wordHashIterator.next()) != null) && (nexthash.trim().length() > 0)) {
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indexEntity = wordIndex.getEntity(nexthash, true);
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if (indexEntity.size() == 0) {
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indexEntity.deleteComplete();
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} else if (indexEntity.size() <= count) {
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// take the whole entity
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tmpEntities.add(indexEntity);
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log.logDebug("Selected Whole Index (" + indexEntity.size() + " urls) for word " + indexEntity.wordHash());
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count -= indexEntity.size();
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} else {
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// make an on-the-fly entity and insert values
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tmpEntity = new plasmaWordIndexEntity(indexEntity.wordHash());
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urlEnum = indexEntity.elements(true);
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while ((urlEnum.hasMoreElements()) && (count > 0)) {
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indexEntry = (plasmaWordIndexEntry) urlEnum.nextElement();
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tmpEntity.addEntry(indexEntry);
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count--;
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}
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urlEnum = null;
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log.logDebug("Selected Partial Index (" + tmpEntity.size() + " from " + indexEntity.size() +" urls) for word " + tmpEntity.wordHash());
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tmpEntities.add(tmpEntity);
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indexEntity.close(); // important: is not closed elswhere and cannot be deleted afterwards
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indexEntity = null;
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}
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}
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// transfer to array
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plasmaWordIndexEntity[] indexEntities = new plasmaWordIndexEntity[tmpEntities.size()];
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for (int i = 0; i < tmpEntities.size(); i++) indexEntities[i] = (plasmaWordIndexEntity) tmpEntities.elementAt(i);
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return indexEntities;
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} catch (IOException e) {
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log.logError("selectTransferIndexes IO-Error (hash=" + nexthash + "): " + e.getMessage());
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e.printStackTrace();
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return new plasmaWordIndexEntity[0];
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} catch (kelondroException e) {
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log.logError("selectTransferIndexes database corrupted: " + e.getMessage());
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e.printStackTrace();
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return new plasmaWordIndexEntity[0];
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}
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}
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private boolean deleteTransferIndexes(plasmaWordIndexEntity[] indexEntities) throws IOException {
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String wordhash;
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Enumeration urlEnum;
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plasmaWordIndexEntry indexEntry;
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plasmaWordIndexEntity indexEntity;
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String[] urlHashes;
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int sz;
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boolean success = true;
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for (int i = 0; i < indexEntities.length; i++) {
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if (indexEntities[i].isTMPEntity()) {
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// delete entries separately
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int c = 0;
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urlHashes = new String[indexEntities[i].size()];
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urlEnum = indexEntities[i].elements(true);
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while (urlEnum.hasMoreElements()) {
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indexEntry = (plasmaWordIndexEntry) urlEnum.nextElement();
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urlHashes[c++] = indexEntry.getUrlHash();
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}
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wordIndex.removeEntries(indexEntities[i].wordHash(), urlHashes, true);
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indexEntity = wordIndex.getEntity(indexEntities[i].wordHash(), true);
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sz = indexEntity.size();
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indexEntity.close();
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log.logDebug("Deleted Partinal Index (" + c + " urls) for word " + indexEntities[i].wordHash() + "; " + sz + " entries left");
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// DEBUG: now try to delete the remaining index. If this works, this routine is fine
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/*
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if (wordIndex.getEntity(indexEntities[i].wordHash()).deleteComplete())
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System.out.println("DEBUG: trial delete of partial word index " + indexEntities[i].wordHash() + " SUCCESSFULL");
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else
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System.out.println("DEBUG: trial delete of partial word index " + indexEntities[i].wordHash() + " FAILED");
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*/
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// end debug
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indexEntities[i].close();
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} else {
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// delete complete file
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if (indexEntities[i].deleteComplete()) {
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indexEntities[i].close();
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} else {
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indexEntities[i].close();
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// have another try...
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if (!(plasmaWordIndexEntity.wordHash2path(wordIndex.getRoot() /*PLASMADB*/, indexEntities[i].wordHash()).delete())) {
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success = false;
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log.logError("Could not delete whole Index for word " + indexEntities[i].wordHash());
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}
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}
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}
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indexEntities[i] = null;
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}
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return success;
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}
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}
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