ES出现异常:

failed to notify ClusterStateListener
java.lang.IllegalStateException: environment is not locked

定位代码:

下载ES 5.5源码,在main/java/org/elasticsearch/env/NodeEnvironment.java 里可以看到:

    private void assertEnvIsLocked() {
if (!closed.get() && locks != null) {
for (Lock lock : locks) {
try {
lock.ensureValid();
} catch (IOException e) {
logger.warn("lock assertion failed", e);
throw new IllegalStateException("environment is not locked", e);
}
}
}
}
assertEnvIsLocked调用地方,可以看到在检测ES node数据路径、index路径使用:
    /**
* Returns an array of all of the nodes data locations.
* @throws IllegalStateException if the node is not configured to store local locations
*/
public Path[] nodeDataPaths() {
assertEnvIsLocked();
Path[] paths = new Path[nodePaths.length];
for(int i=0;i<paths.length;i++) {
paths[i] = nodePaths[i].path;
}
return paths;
} /**
* Returns an array of all of the {@link NodePath}s.
*/
public NodePath[] nodePaths() {
assertEnvIsLocked();
if (nodePaths == null || locks == null) {
throw new IllegalStateException("node is not configured to store local location");
}
return nodePaths;
} public int getNodeLockId() {
assertEnvIsLocked();
if (nodePaths == null || locks == null) {
throw new IllegalStateException("node is not configured to store local location");
}
return nodeLockId;
} /**
* Returns all index paths.
*/
public Path[] indexPaths(Index index) {
assertEnvIsLocked();
Path[] indexPaths = new Path[nodePaths.length];
for (int i = 0; i < nodePaths.length; i++) {
indexPaths[i] = nodePaths[i].resolve(index);
}
return indexPaths;
}
而locks变量的赋值在:
 public NodeEnvironment(Settings settings, Environment environment) throws IOException {

        if (!DiscoveryNode.nodeRequiresLocalStorage(settings)) {
nodePaths = null;
sharedDataPath = null;
locks = null;
nodeLockId = -1;
nodeMetaData = new NodeMetaData(generateNodeId(settings));
logger = Loggers.getLogger(getClass(), Node.addNodeNameIfNeeded(settings, this.nodeMetaData.nodeId()));
return;
}
final NodePath[] nodePaths = new NodePath[environment.dataWithClusterFiles().length];
final Lock[] locks = new Lock[nodePaths.length];
boolean success = false;
。。。

查了下Lock这个类:

import org.apache.lucene.store.Lock

作用:

  • org.apache.lucene.store.Lock
  • An interprocess mutex lock.

    Typical use might look like:

     new Lock.With(directory.makeLock("my.lock")) {
    public Object doBody() {
    ... code to execute while locked ...
    }
    }.run(); 一些加锁、解锁例子 https://www.programcreek.com/java-api-examples/index.php?api=org.apache.lucene.store.Lock
    lucene锁的作用,写保护:在Lucene中,打开一个IndexWrite之后,就会自动在索引目录中生成write.lock文件,这个文件中并不会有内容,不管是在索引打开期间还是在索引关闭之后,其大小都为0KB,并且在IndexWriter关闭之后,并不会删除该文件。如果同时打开多个IndexWriter的话,后打开的IndexWriter就会抛出LockObtainFailedException异常。这是个很重要的保护机制,因为若针对同一索引打开两个writer的话,会导致索引损坏。所以Lucene中的锁主要针对并发写的情况,在写的过程中并不会影响到并发读操作。

    1. lucene并发规则

    a,任意数量的只读属性IndexReader类都可以同时打开一个索引。

    b,对于一个索引来说,一次只能打开一个IndexWriter对象。lucene采用锁来提供保障。

    c,IndexReader可以在indexwriter正在修改索引时打开。该对象只有在IndexWriter提交修改或自己重新打开后才能获知索引的修改情况。

    d,任意多个线程可以共享同一个indexreader或indexwriter。

    2. lucene锁机制

    为了实现单一的writer,lucene采用了基于文件的锁,如果锁文件(默认writer.lock)存在于你的索引所在目录内,说明此时正在打开一个writer。此时若企图对同一个索引文件创建其他的writer的话,将产生一个LockObtainFailedException异常。

    而由assertEnvIsLocked看,抛出的异常应该是锁出现了问题,文件损坏或者目录损坏、或者文件系统损坏导致。

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