This commit addresses an issue that was leading to snapshot corruption for snapshots stored as blobs in Azure Storage.
The underlying issue is that in cases when multiple snapshots of an index were taken and persisted into Azure Storage, snapshots subsequent
to the first would repeatedly overwrite the snapshot files. This issue does render useless all snapshots except the final snapshot.
The root cause of this is due to String concatenation involving null. In particular, to list all of the blobs in a snapshot directory in
Azure the code would use the method listBlobsByPrefix where the prefix is null. In the listBlobsByPrefix method, the path keyPath + prefix
is constructed. However, per 5.1.11, 5.4 and 15.18.1 of the Java Language Specification, the reference null is first converted to the string
"null" before performing the concatenation. This leads to no blobs being returned and therefore the snapshot mechanism would operate as if
it were writing the first snapshot of the index. The fix is simply to check if prefix is null and handle the concatenation accordingly.
Upon fixing this issue so that subsequent snapshots would no longer overwrite earlier snapshots, it was discovered that the snapshot metadata
returned by the listBlobsByPrefix method was not sufficient for the snapshot layer to detect whether or not the Lucene segments had already
been copied to the Azure storage layer in an earlier snapshot. This led the snapshot layer to unnecessarily duplicate these Lucene segments
in Azure Storage.
The root cause of this is due to known behavior in the CloudBlobContainer.getBlockBlobReference method in the Azure API. Namely, this method
does not fetch blob attributes from Azure. As such, the lengths of all the blobs appeared to the snapshot layer to be of length zero and
therefore they would compare as not equal to any new blobs that the snapshot layer is going to persist. To remediate this, the method
CloudBlockBlob.downloadAttributes must be invoked. This will fetch the attributes from Azure Storage so that a proper comparison of the
blobs can be performed.
Closeselastic/elasticsearch-cloud-azure#51, closeselastic/elasticsearch-cloud-azure#99
Today everything is tight to having the next version as the latest.
In order to work towards 2.0.0.beta1 we need to fix all the usage of
2.0.0-SNAPSHOT to reflect the version we will release soon.
Usually we do this on the release branch but to simplify things I wanna
keep this on master for now and move to 2.1.0-SNAPSHOT on master once
we created a 2.0 branch.
Closes#12148
Reported in https://github.com/elastic/elasticsearch/issues/11647#issuecomment-118523861
> btw, I think you broke some plugins on Master, cloud-aws doesn't register s3 repos anymore.
```
org.elasticsearch.common.inject.CreationException: Guice creation errors:
1) Error injecting constructor, java.lang.NoClassDefFoundError: org/apache/http/protocol/HttpContext
at org.elasticsearch.repositories.s3.S3Repository.<init>(Unknown Source)
while locating org.elasticsearch.repositories.s3.S3Repository
while locating org.elasticsearch.repositories.Repository
1 error
at org.elasticsearch.common.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:344)
at org.elasticsearch.common.inject.InjectorBuilder.injectDynamically(InjectorBuilder.java:178)
at org.elasticsearch.common.inject.InjectorBuilder.build(InjectorBuilder.java:110)
at org.elasticsearch.common.inject.InjectorImpl.createChildInjector(InjectorImpl.java:140)
at org.elasticsearch.common.inject.ModulesBuilder.createChildInjector(ModulesBuilder.java:69)
at org.elasticsearch.repositories.RepositoriesService.createRepositoryHolder(RepositoriesService.java:404)
at org.elasticsearch.repositories.RepositoriesService.registerRepository(RepositoriesService.java:368)
at org.elasticsearch.repositories.RepositoriesService.access$100(RepositoriesService.java:55)
at org.elasticsearch.repositories.RepositoriesService$1.execute(RepositoriesService.java:110)
at org.elasticsearch.cluster.service.InternalClusterService$UpdateTask.run(InternalClusterService.java:378)
at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:209)
at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:179)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: org/apache/http/protocol/HttpContext
at com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:129)
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:432)
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:414)
at org.elasticsearch.cloud.aws.InternalAwsS3Service.getClient(InternalAwsS3Service.java:153)
at org.elasticsearch.cloud.aws.InternalAwsS3Service.client(InternalAwsS3Service.java:82)
at org.elasticsearch.repositories.s3.S3Repository.<init>(S3Repository.java:125)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.elasticsearch.common.inject.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:56)
at org.elasticsearch.common.inject.ConstructorInjector.construct(ConstructorInjector.java:86)
at org.elasticsearch.common.inject.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:104)
at org.elasticsearch.common.inject.FactoryProxy.get(FactoryProxy.java:54)
at org.elasticsearch.common.inject.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:47)
at org.elasticsearch.common.inject.InjectorImpl.callInContext(InjectorImpl.java:865)
at org.elasticsearch.common.inject.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:43)
at org.elasticsearch.common.inject.Scopes$1$1.get(Scopes.java:59)
at org.elasticsearch.common.inject.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:46)
at org.elasticsearch.common.inject.InjectorBuilder$1.call(InjectorBuilder.java:201)
at org.elasticsearch.common.inject.InjectorBuilder$1.call(InjectorBuilder.java:193)
at org.elasticsearch.common.inject.InjectorImpl.callInContext(InjectorImpl.java:858)
at org.elasticsearch.common.inject.InjectorBuilder.loadEagerSingletons(InjectorBuilder.java:193)
at org.elasticsearch.common.inject.InjectorBuilder.injectDynamically(InjectorBuilder.java:175)
... 13 more
Caused by: java.lang.ClassNotFoundException: org.apache.http.protocol.HttpContext
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 37 more
```
Closes#12034.
Follow up for https://github.com/elastic/elasticsearch-analysis-kuromoji/issues/61
We don't shade anymore elasticsearch dependencies, so plugins might include jars in the distribution ZIP file which might not be needed anymore.
For example, `elasticsearch-cloud-aws` comes with:
```
Archive: cloud-aws/target/releases/elasticsearch-cloud-aws-2.0.0-SNAPSHOT.zip
Length Date Time Name
-------- ---- ---- ----
1920788 05-18-15 09:42 aws-java-sdk-ec2-1.9.34.jar
503963 05-18-15 09:42 aws-java-sdk-core-1.9.34.jar
232771 01-19-15 09:24 commons-codec-1.6.jar
915096 01-19-15 09:24 jackson-databind-2.3.2.jar
252288 05-18-15 09:42 aws-java-sdk-kms-1.9.34.jar
62050 01-19-15 09:24 commons-logging-1.1.3.jar
282269 10-31-14 13:19 httpcore-4.3.2.jar
35058 01-19-15 09:24 jackson-annotations-2.3.0.jar
229998 05-29-15 12:28 jackson-core-2.5.3.jar
589289 01-19-15 09:24 joda-time-2.7.jar
562858 05-18-15 09:42 aws-java-sdk-s3-1.9.34.jar
590533 10-31-14 13:19 httpclient-4.3.5.jar
44854 06-12-15 19:22 elasticsearch-cloud-aws-2.0.0-SNAPSHOT.jar
-------- -------
6221815 13 files
```
A lot of those files are already distributed with elasticsearch itself so classes are available within the classloader.
We mark all es core dependencies as provided in plugins.
We also remove `groupId` as already defined in parent pom.
And we remove non needed licenses files as some jars are not included anymore in plugins.
Closes#11647.
With a recent change in core, we don't support anymore non explicit byte size units when setting values.
This commit fix that in azure repository. Otherwise, tests can't be executed.
