[jira] [Created] (JCR-3875) S3 data store: maxConnections <= writeThreads leads to exception

["Alexander Klimetschek (JIRA)" <ji...@apache.org>]

Alexander Klimetschek created JCR-3875:
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             Summary: S3 data store: maxConnections <= writeThreads leads to exception
                 Key: JCR-3875
                 URL: https://issues.apache.org/jira/browse/JCR-3875
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-data
            Reporter: Alexander Klimetschek
            Priority: Critical


The S3 data store [tries to create a thread pool|https://github.com/apache/jackrabbit/blob/a9e005191a63078abdcaeace50887f79c79415cb/jackrabbit-aws-ext/src/main/java/org/apache/jackrabbit/aws/ext/ds/S3Backend.java#L170-L171] with

{{maxConnections - writeThreads}}

but this will fail if you specify the same value for both or less maxConnections than writeThreads, and throw:

{noformat}
Caused by: org.apache.jackrabbit.core.data.DataStoreException: Could not initialize S3 from {s3Encryption=SSE_S3, component.name=org.apache.jackrabbit.oak.plugins.blob.datastore.S3DataStore, maxConnections=40, secretKey=XXXXXXX, writeThreads=40, service.vendor=The Apache Software Foundation, s3Bucket=XXXXX, socketTimeout=120000, service.pid=org.apache.jackrabbit.oak.plugins.blob.datastore.S3DataStore, component.id=79, connectionTimeout=120000, accessKey=XXXXXXX, s3EndPoint=s3.amazonaws.com, s3Region=us-standard, maxErrorRetry=10, path=./crx-quickstart/repository/datastore}
	at org.apache.jackrabbit.aws.ext.ds.S3Backend.init(S3Backend.java:188)
	at org.apache.jackrabbit.aws.ext.ds.S3Backend.init(S3Backend.java:121)
	at org.apache.jackrabbit.core.data.CachingDataStore.init(CachingDataStore.java:267)
	... 23 common frames omitted
Caused by: java.lang.IllegalArgumentException: null
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1310)
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1233)
	at java.util.concurrent.Executors.newFixedThreadPool(Executors.java:114)
	at org.apache.jackrabbit.aws.ext.ds.S3Backend.init(S3Backend.java:174)
	... 25 common frames omitted
{noformat}

It's also not intuitive at all. Maybe it's better to specify the thread pools explicitly, i.e. {{writeThreads}} and {{otherThreads}} (whatever that 2nd pool exactly is).



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