Orient DB 3.0.18：没有名称'snappy'的压缩

Question

我正在尝试使用Orient DB v2.2.37创建的Orient DB 3.0.18打开数据库，但是输出错误“没有名称压缩'snappy'的错误”。如何使用Orient V3注册快速压缩？我在maven POM中尝试了org.xerial.snappy，但没有快乐。提前致谢。

2019-04-22 21:44:20 t.c.s.a.d.Services [DEBUG] error:stop:com.orientechnologies.orient.core.exception.OSecurityException: Compression with name 'snappy' is absent
com.orientechnologies.orient.core.exception.OSecurityException: Compression with name 'snappy' is absent
    at com.orientechnologies.orient.core.compression.OCompressionFactory.getCompression(OCompressionFactory.java:79)
    at com.orientechnologies.orient.core.storage.cluster.v0.OPaginatedClusterV0.init(OPaginatedClusterV0.java:1547)
    at com.orientechnologies.orient.core.storage.cluster.v0.OPaginatedClusterV0.configure(OPaginatedClusterV0.java:154)
    at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.createClusterFromConfig(OAbstractPaginatedStorage.java:4804)
    at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.openClusters(OAbstractPaginatedStorage.java:519)
    at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.open(OAbstractPaginatedStorage.java:388)
    at com.orientechnologies.orient.core.db.OrientDBEmbedded.open(OrientDBEmbedded.java:281)
    at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.open(ODatabaseDocumentTx.java:903)
    at com.orientechnologies.orient.core.db.OPartitionedDatabasePool$DatabaseDocumentTxPooled.internalOpen(OPartitionedDatabasePool.java:440)
    at com.orientechnologies.orient.core.db.OPartitionedDatabasePool.openDatabase(OPartitionedDatabasePool.java:303)
    at com.orientechnologies.orient.core.db.OPartitionedDatabasePool.acquire(OPartitionedDatabasePool.java:261)
    at com.tinkerpop.blueprints.impls.orient.OrientBaseGraph.<init>(OrientBaseGraph.java:172)
    at com.tinkerpop.blueprints.impls.orient.OrientTransactionalGraph.<init>(OrientTransactionalGraph.java:78)
    at com.tinkerpop.blueprints.impls.orient.OrientGraph.<init>(OrientGraph.java:137)
    at com.tinkerpop.blueprints.impls.orient.OrientGraphFactory$1.getGraph(OrientGraphFactory.java:87)
    at com.tinkerpop.blueprints.impls.orient.OrientGraphFactory.getTx(OrientGraphFactory.java:224)

Answer 1

在嵌入模式下使用Orient DB的分辨率如下：

1）从Orient DB Github repo下载OSnappyCompression.java并将其合并到您的项目中

2）将以下lib添加到Maven pom.xml中

 <dependency>
     <groupId>org.xerial.snappy</groupId>
     <artifactId>snappy-java</artifactId>
     <version>1.1.7.3</version>
 </dependency>

3）在启动Orient DB之前注册Snappy压缩方法如下

 OCompressionFactory.INSTANCE.register(new OSnappyCompression());

Answer 2

不幸的是，这种压缩被删除了。您必须将数据库转换为非压缩版本。