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From "Martin Wehner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-4565) S3Backend fails to upload large metadata records
Date Fri, 15 Jul 2016 10:45:20 GMT
Martin Wehner created OAK-4565:
----------------------------------

             Summary: S3Backend fails to upload large metadata records
                 Key: OAK-4565
                 URL: https://issues.apache.org/jira/browse/OAK-4565
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: blob
    Affects Versions: 1.4.5
            Reporter: Martin Wehner


If a large enough metadata record is added to a S3 DS (like the list of blob references collected
during the mark phase of the MarkSweepGC) the upload will fail (i.e. never start). This is
caused by {{S3Backend.addMetadataRecord()}} providing an InputStream to the S3 TransferManager
without specifying the size in the Metadata. 
A warning to this effect is logged by the AWS SDK each time you add a metadata record: 
{noformat}
[s3-transfer-manager-worker-1] AmazonS3Client.java:1364 No content length specified for stream
data.  Stream contents will be buffered in memory and could result in out of memory errors.
{noformat}

Normally this shouldn't be too big of a problem but in a repository with over 36 million blob
references the list of marked refs produced by the GC is over 5GB. In this case the S3 transfer
worker thread will be stuck in a seemingly endless loop where it tries to allocate the memory
reading the file into memory and never finishes (although the JVM has 80GB of heap), eating
away resources in the process:

{noformat}
   java.lang.Thread.State: RUNNABLE
	at org.apache.http.util.ByteArrayBuffer.append(ByteArrayBuffer.java:90)
	at org.apache.http.util.EntityUtils.toByteArray(EntityUtils.java:137)
	at org.apache.http.entity.BufferedHttpEntity.<init>(BufferedHttpEntity.java:63)
	at com.amazonaws.http.HttpRequestFactory.newBufferedHttpEntity(HttpRequestFactory.java:247)
	at com.amazonaws.http.HttpRequestFactory.createHttpRequest(HttpRequestFactory.java:126)
	at com.amazonaws.http.AmazonHttpClient$ExecOneRequestParams.newApacheRequest(AmazonHttpClient.java:650)
	at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:730)
	at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:505)
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:317)
	at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3595)
	at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1382)
	at com.amazonaws.services.s3.transfer.internal.UploadCallable.uploadInOneChunk(UploadCallable.java:131)
	at com.amazonaws.services.s3.transfer.internal.UploadCallable.call(UploadCallable.java:123)
	at com.amazonaws.services.s3.transfer.internal.UploadMonitor.call(UploadMonitor.java:139)
	at com.amazonaws.services.s3.transfer.internal.UploadMonitor.call(UploadMonitor.java:47)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
{noformat} 

The last log message by the GC thread will be like this:
{noformat}
*INFO* [sling-oak-observation-1273] org.apache.jackrabbit.oak.plugins.blob.MarkSweepGarbageCollector
Number of valid blob references marked under mark phase of Blob garbage collection [36147734]
{noformat} 

followed by the above AWS warning, then it will stall waiting for the transfer to finish.



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