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https://issues.apache.org/jira/browse/OAK-8006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16784351#comment-16784351
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Andrei Dulceanu commented on OAK-8006:
--------------------------------------
Backported to 1.8 at r1854844.
> SegmentBlob#readLongBlobId might cause SegmentNotFoundException on standby
> --------------------------------------------------------------------------
>
> Key: OAK-8006
> URL: https://issues.apache.org/jira/browse/OAK-8006
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segment-tar, tarmk-standby
> Affects Versions: 1.6.0
> Reporter: Andrei Dulceanu
> Assignee: Andrei Dulceanu
> Priority: Major
> Labels: cold-standby
> Fix For: 1.12, 1.11.0, 1.10.1
>
> Attachments: OAK-8006-02.patch, OAK-8006-test.patch, OAK-8006.patch
>
>
> When persisting a segment transferred from master, among others, the cold
> standby needs to read the binary references from the segment. While this
> usually doesn't involve any additional reads from any other segments, there
> is a special case concerning binary IDs larger than 4092 bytes. These can
> live in other segments (which got transferred prior to the current segment
> and are already on the standby), but it might also be the case that the
> binary ID is stored in the same segment. If this happens, the call to
> {{blobId.getSegment()}}[0], triggers a new read of the current, un-persisted
> segment . Thus, a {{SegmentNotFoundException}} is thrown:
> {noformat}
> 22.01.2019 09:35:59.345 *ERROR* [standby-run-1]
> org.apache.jackrabbit.oak.segment.standby.client.StandbyClientSync Failed
> synchronizing state.
> org.apache.jackrabbit.oak.segment.SegmentNotFoundException: Segment
> d40a9da6-06a2-4dc0-ab91-5554a33c02b0 not found
> at
> org.apache.jackrabbit.oak.segment.file.AbstractFileStore.readSegmentUncached(AbstractFileStore.java:284)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.file.FileStore.lambda$readSegment$10(FileStore.java:498)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.SegmentCache$NonEmptyCache.lambda$getSegment$0(SegmentCache.java:163)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4724)
> [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
> at
> com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3522)
> [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
> at
> com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2315)
> [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
> at
> com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2278)
> [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
> at
> com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2193)
> [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
> at com.google.common.cache.LocalCache.get(LocalCache.java:3932)
> [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
> at
> com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4721)
> [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
> at
> org.apache.jackrabbit.oak.segment.SegmentCache$NonEmptyCache.getSegment(SegmentCache.java:160)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.file.FileStore.readSegment(FileStore.java:498)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.SegmentId.getSegment(SegmentId.java:153)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.RecordId.getSegment(RecordId.java:98)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.SegmentBlob.readLongBlobId(SegmentBlob.java:206)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.SegmentBlob.readBlobId(SegmentBlob.java:163)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.file.AbstractFileStore$3.consume(AbstractFileStore.java:262)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.Segment.forEachRecord(Segment.java:601)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.file.AbstractFileStore.readBinaryReferences(AbstractFileStore.java:257)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.file.FileStore.writeSegment(FileStore.java:533)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.standby.client.StandbyClientSyncExecution.copySegmentFromPrimary(StandbyClientSyncExecution.java:225)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.standby.client.StandbyClientSyncExecution.copySegmentHierarchyFromPrimary(StandbyClientSyncExecution.java:194)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.standby.client.StandbyClientSyncExecution.compareAgainstBaseState(StandbyClientSyncExecution.java:101)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.standby.client.StandbyClientSyncExecution.execute(StandbyClientSyncExecution.java:76)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.jackrabbit.oak.segment.standby.client.StandbyClientSync.run(StandbyClientSync.java:165)
> [org.apache.jackrabbit.oak-segment-tar:1.10.0]
> at
> org.apache.sling.commons.scheduler.impl.QuartzJobExecutor.execute(QuartzJobExecutor.java:347)
> [org.apache.sling.commons.scheduler:2.7.2]
> at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
> [org.apache.sling.commons.scheduler:2.7.2]
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> at java.base/java.lang.Thread.run(Thread.java:834){noformat}
>
> [0]
> https://github.com/apache/jackrabbit-oak/blob/trunk/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/SegmentBlob.java#L205
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