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| 1 | +package org.elasticsearch.plugin.lruclient; |
| 2 | + |
| 3 | +import java.util.Collections; |
| 4 | +import java.util.Date; |
| 5 | +import java.util.LinkedHashMap; |
| 6 | +import java.util.Map; |
| 7 | +import java.util.Map.Entry; |
| 8 | +import java.util.concurrent.TimeUnit; |
| 9 | +import org.elasticsearch.action.ActionFuture; |
| 10 | +import org.elasticsearch.action.ActionResponse; |
| 11 | +import org.elasticsearch.action.admin.indices.status.ShardStatus; |
| 12 | +import org.elasticsearch.client.node.NodeAdminClient; |
| 13 | +import org.elasticsearch.common.logging.Loggers; |
| 14 | +import org.elasticsearch.common.logging.ESLogger; |
| 15 | +import org.elasticsearch.index.shard.IndexShardState; |
| 16 | +import org.elasticsearch.indices.IndexMissingException; |
| 17 | + |
| 18 | +/** |
| 19 | + * |
| 20 | + * @author matt |
| 21 | + */ |
| 22 | +public class LruIndexManager { |
| 23 | + public static final int MAX_OPEN_RETRIES = 3; |
| 24 | + |
| 25 | + private Map cache; |
| 26 | + private NodeAdminClient admin; |
| 27 | + private final ESLogger logger = Loggers.getLogger(getClass()); |
| 28 | + |
| 29 | + public LruIndexManager(int cache_size, NodeAdminClient admin) { |
| 30 | + this.cache = Collections.synchronizedMap(new LruCache(cache_size)); |
| 31 | + this.admin = admin; |
| 32 | + } |
| 33 | + |
| 34 | + public interface IndexOperation { |
| 35 | + public void perform(); |
| 36 | + } |
| 37 | + |
| 38 | + public interface AsyncIndexOperation { |
| 39 | + public ActionFuture<? extends ActionResponse> perform(); |
| 40 | + } |
| 41 | + |
| 42 | + |
| 43 | + public ActionFuture<? extends ActionResponse> ensureOpen(final String index, AsyncIndexOperation op) { |
| 44 | + return ensureOpenAndPerform(new String[]{index},op); |
| 45 | + } |
| 46 | + |
| 47 | + public ActionFuture<? extends ActionResponse> ensureOpen(final String [] indices, AsyncIndexOperation op) { |
| 48 | + return ensureOpenAndPerform(indices,op); |
| 49 | + } |
| 50 | + |
| 51 | + public void ensureOpen(final String index, IndexOperation op) { |
| 52 | + ensureOpenAndPerform(new String[]{index},op); |
| 53 | + } |
| 54 | + |
| 55 | + public void ensureOpen(final String [] indices, IndexOperation op) { |
| 56 | + ensureOpenAndPerform(indices,op); |
| 57 | + } |
| 58 | + |
| 59 | + // private |
| 60 | + |
| 61 | + private ActionFuture<? extends ActionResponse> ensureOpenAndPerform(String [] indices, Object op) { |
| 62 | + int tries = 0; |
| 63 | + boolean force = false; |
| 64 | + while(true) { |
| 65 | + |
| 66 | + // make sure in cache |
| 67 | + for(int i = 0; i<indices.length; i++) |
| 68 | + openIfNotCached(indices[i],force); |
| 69 | + |
| 70 | + try { |
| 71 | + if(op instanceof AsyncIndexOperation) |
| 72 | + return ((AsyncIndexOperation)op).perform(); |
| 73 | + else { |
| 74 | + ((IndexOperation)op).perform(); |
| 75 | + return null; |
| 76 | + } |
| 77 | + |
| 78 | + } |
| 79 | + catch(IndexMissingException e) { |
| 80 | + if(tries++>MAX_OPEN_RETRIES) |
| 81 | + throw(e); |
| 82 | + else |
| 83 | + force = true; // make sure we eject the index |
| 84 | + } |
| 85 | + } |
| 86 | + } |
| 87 | + |
| 88 | + private void openIfNotCached(final String index, boolean force_eject) { |
| 89 | + synchronized(index.intern()) { |
| 90 | + if(force_eject) |
| 91 | + this.cache.remove(index); |
| 92 | + |
| 93 | + if(!this.cache.containsKey(index)) { |
| 94 | + logger.debug("Index {} not found! Try to open...", index); |
| 95 | + openIndex(index); |
| 96 | + } |
| 97 | + this.cache.put(index, new Date()); |
| 98 | + } |
| 99 | + } |
| 100 | + |
| 101 | + private class LruCache extends LinkedHashMap<String, Date> { |
| 102 | + private int capacity; |
| 103 | + public LruCache(int capacity) { |
| 104 | + super(capacity,0.75f,true); |
| 105 | + this.capacity = capacity; |
| 106 | + } |
| 107 | + |
| 108 | + @Override |
| 109 | + protected boolean removeEldestEntry(Entry<String, Date> eldest) { |
| 110 | + if(size()>capacity) { |
| 111 | + logger.debug("LruCache over capacity: {} removing: {}", this.capacity, eldest.getKey()); |
| 112 | + closeIndex(eldest.getKey()); |
| 113 | + return true; |
| 114 | + } |
| 115 | + return false; |
| 116 | + } |
| 117 | + |
| 118 | + } |
| 119 | + |
| 120 | + private void openIndex(final String index) { |
| 121 | + try { |
| 122 | + admin.indices().prepareOpen(index).execute().actionGet(); |
| 123 | + waitForReadyState(index); |
| 124 | + } |
| 125 | + catch(IndexMissingException e) { |
| 126 | + logger.debug("Index {} does not exist! Can't open.", index); |
| 127 | + } |
| 128 | + } |
| 129 | + |
| 130 | + private void waitForReadyState(final String index) { |
| 131 | + boolean notReady = true; |
| 132 | + long stop=System.nanoTime()+TimeUnit.SECONDS.toNanos(10); |
| 133 | + while(notReady) { |
| 134 | + if(stop<System.nanoTime()) { |
| 135 | + logger.debug("Timeout waiting for status of index {}",index); |
| 136 | + break; |
| 137 | + } |
| 138 | + // need to wait till all shards are allocated! |
| 139 | + logger.debug("Checking for state in index {}",index); |
| 140 | + ShardStatus [] stats = admin.indices().prepareStatus(new String[]{index}).execute().actionGet().getShards(); |
| 141 | + logger.debug("Checking for state in index {} with # shards: {}",index,stats.length); |
| 142 | + if(stats.length<1) { |
| 143 | + logger.debug("No shards found for index {}!!",index); |
| 144 | + try { Thread.sleep(500); } catch(InterruptedException e) {} |
| 145 | + continue; |
| 146 | + } |
| 147 | + notReady = false; |
| 148 | + for(int i=0;i<stats.length;i++) { |
| 149 | + logger.debug("Index {} Shard {} State {}",index,stats[i].getShardId(),stats[i].getState()); |
| 150 | + if(stats[i].getState() != IndexShardState.STARTED) { |
| 151 | + try { Thread.sleep(500); } catch(InterruptedException e) {} |
| 152 | + notReady = true; |
| 153 | + break; |
| 154 | + } |
| 155 | + } |
| 156 | + } |
| 157 | + logger.debug("Index {} all shards STARTED!",index); |
| 158 | + } |
| 159 | + |
| 160 | + private void closeIndex(final String index) { |
| 161 | + // let happen in the background |
| 162 | + logger.debug("Closing index: {} ...", index); |
| 163 | + admin.indices().prepareClose(index).execute().actionGet(); |
| 164 | + } |
| 165 | + |
| 166 | + |
| 167 | +} |
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