Arek Kita created OAK-6611:
------------------------------
Summary: [upgrade][oak-blob-cloud] Many S3DataStore errors during
migration with oak-upgrade
Key: OAK-6611
URL: https://issues.apache.org/jira/browse/OAK-6611
Project: Jackrabbit Oak
Issue Type: Bug
Components: blob-cloud, upgrade
Affects Versions: 1.8, 1.7.7
Reporter: Arek Kita
Assignee: Amit Jain
Priority: Critical
[~tomek.rekawek], [~amitjain] Due to async nature of S3 datastore format/upload
process the migration ends up way quicker than S3 datastore is being migrated.
This leads to a huge number of exceptions shown due to *non synchronised*
nature of *oak-upgrade* migration process vs async S3 datastore background
processes.
I see a few possible solutions for that:
* disable migration/uploading of S3 cache for the time of migration (bad idea
IMHO)
* wait for it (it might be desired or a bad idea as it might take longer than
migration for a few cases)
* pause it when migration is completed in a clean way (so some binaries aren't
uploaded and moved to a new datastore format) -- not sure if such mixed state
is ok at all
WDYT?
Please also note that this happens only when {{\-\-src-s3config
\-\-src-s3datastore}} options are specified during migration which in many
cases is true (this would be the same for the destination DataStore options).
Referencing a source datastore is needed (even if {{\-\-copy-binaries}} is not
included) in example to copy checkpoints properly.
The example exception is like the below:
{code}
01.09.2017 11:39:41.088 ERROR o.a.j.o.p.b.UploadStagingCache: Error adding
file to backend
java.lang.IllegalStateException: Connection pool shut down
at org.apache.http.util.Asserts.check(Asserts.java:34)
at
org.apache.http.pool.AbstractConnPool.lease(AbstractConnPool.java:184)
at
org.apache.http.impl.conn.PoolingHttpClientConnectionManager.requestConnection(PoolingHttpClientConnectionManager.java:251)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
com.amazonaws.http.conn.ClientConnectionManagerFactory$Handler.invoke(ClientConnectionManagerFactory.java:76)
at com.amazonaws.http.conn.$Proxy3.requestConnection(Unknown Source)
at
org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:175)
at
org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
at
org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
at
com.amazonaws.http.apache.client.impl.SdkHttpClient.execute(SdkHttpClient.java:72)
at
com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:880)
at
com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:723)
at
com.amazonaws.http.AmazonHttpClient.doExecute(AmazonHttpClient.java:475)
at
com.amazonaws.http.AmazonHttpClient.executeWithTimer(AmazonHttpClient.java:437)
at
com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:386)
at
com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3996)
at
com.amazonaws.services.s3.AmazonS3Client.getObjectMetadata(AmazonS3Client.java:1161)
at
com.amazonaws.services.s3.AmazonS3Client.getObjectMetadata(AmazonS3Client.java:1136)
at
org.apache.jackrabbit.oak.blob.cloud.s3.S3Backend.write(S3Backend.java:201)
at
org.apache.jackrabbit.oak.plugins.blob.AbstractSharedCachingDataStore$2.write(AbstractSharedCachingDataStore.java:170)
at
org.apache.jackrabbit.oak.plugins.blob.UploadStagingCache$4.call(UploadStagingCache.java:341)
at
org.apache.jackrabbit.oak.plugins.blob.UploadStagingCache$4.call(UploadStagingCache.java:336)
at
com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:108)
at
com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:41)
at
com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:77)
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)
{code}
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