[OAK-6678] Syncing big blobs fails since StandbyServer sends persisted head

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.7.9, 1.8.0
• Component/s: segment-tar, tarmk-standby
• Labels: cold-standby resilience
• Assignee: Andrei Dulceanu
• Reporter: Andrei Dulceanu
• Created: 17/Sep/17 05:53
• Updated: 04/Oct/19 17:53
• Resolved: 28/Sep/17 12:28

Description

With changes for OAK-6653 in place, ExternalPrivateStoreIT#testSyncBigBlog and sometimes ExternalSharedStoreIT#testSyncBigBlob are failing on CI:

org.apache.jackrabbit.oak.segment.standby.ExternalSharedStoreIT
testSyncBigBlob(org.apache.jackrabbit.oak.segment.standby.ExternalSharedStoreIT)  Time elapsed: 96.82 sec  <<< FAILURE!
java.lang.AssertionError: expected:<{ root = { ... } }> but was:<{ root : { } }>
...
testSyncBigBlob(org.apache.jackrabbit.oak.segment.standby.ExternalPrivateStoreIT)  Time elapsed: 95.254 sec  <<< FAILURE!
java.lang.AssertionError: expected:<{ root = { ... } }> but was:<{ root : { } }>

Partial stacktrace:

14:09:08.355 DEBUG [main] StandbyServer.java:242            Binding was successful
14:09:08.358 DEBUG [standby-1] GetHeadRequestEncoder.java:33 Sending request from client Bar for current head
14:09:08.359 DEBUG [primary-1] ClientFilterHandler.java:53  Client /127.0.0.1:52988 is allowed
14:09:08.360 DEBUG [primary-1] RequestDecoder.java:42       Parsed 'get head' message
14:09:08.360 DEBUG [primary-1] CommunicationObserver.java:79 Message 'get head' received from client Bar
14:09:08.362 DEBUG [primary-1] GetHeadRequestHandler.java:43 Reading head for client Bar
14:09:08.363 WARN  [primary-1] ExceptionHandler.java:31     Exception caught on the server
java.lang.NullPointerException: null
	at org.apache.jackrabbit.oak.segment.standby.server.DefaultStandbyHeadReader.readHeadRecordId(DefaultStandbyHeadReader.java:32) ~[oak-segment-tar-1.8-SNAPSHOT.jar:1.8-SNAPSHOT]
	at org.apache.jackrabbit.oak.segment.standby.server.GetHeadRequestHandler.channelRead0(GetHeadRequestHandler.java:45) ~[oak-segment-tar-1.8-SNAPSHOT.jar:1.8-SNAPSHOT]