[OAK-8930] More resilient blob listing for the Azure Segment Store

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.26.0
• Component/s: segment-azure
• Labels: candidate_oak_1_22
• Assignee: Tomek Rękawek
• Reporter: Tomek Rękawek
• Created: 27/Feb/20 17:10
• Updated: 12/Sep/23 08:50
• Resolved: 27/Feb/20 17:11

Description

If the Azure Storage is not responsive, then the segment listing method may fail with:

java.util.NoSuchElementException: An error occurred while enumerating the result, check the original exception for details.
	at com.microsoft.azure.storage.core.LazySegmentedIterator.hasNext(LazySegmentedIterator.java:113)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:132)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
	at org.apache.jackrabbit.oak.segment.azure.AzureUtilities.getBlobs(AzureUtilities.java:76)
	at org.apache.jackrabbit.oak.segment.azure.AzureSegmentArchiveReader.<init>(AzureSegmentArchiveReader.java:61)
	at org.apache.jackrabbit.oak.segment.azure.AzureArchiveManager.forceOpen(AzureArchiveManager.java:122)
	at org.apache.jackrabbit.oak.segment.azure.tool.SegmentStoreMigrator.migrateArchives(SegmentStoreMigrator.java:164)
	at org.apache.jackrabbit.oak.segment.azure.tool.SegmentStoreMigrator.migrate(SegmentStoreMigrator.java:92)
...
Caused by: com.microsoft.azure.storage.StorageException: The client could not finish the operation within specified maximum execution timeout.
	at com.microsoft.azure.storage.core.ExecutionEngine.executeWithRetry(ExecutionEngine.java:254)
	at com.microsoft.azure.storage.core.LazySegmentedIterator.hasNext(LazySegmentedIterator.java:109)
	... 15 common frames omitted
Caused by: java.util.concurrent.TimeoutException: The client could not finish the operation within specified maximum execution timeout.
	at com.microsoft.azure.storage.core.ExecutionEngine.executeWithRetry(ExecutionEngine.java:253)
	... 16 common frames omitted

We can use the listBlobsSegmented() method and retry it manually, like we do for the segment migration.

//cc: adulceanu

Issue Links

• causes: OAK-9054 Improved blob listing performance for the Azure Segment Store