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SegmentNotFound Exception

venkateshs73486
Employee
Employee

Team,

Our client face SegmentNotFoundException in their environment which is in 6.4.5.

while we know the standard adobe solution for this. ( i.e running oak-run command), we would like to know the rootcause for this.

Any guidance?

One of the Adobe docs mentioned that online tar compaction may have removed the segment. Is it possible?

We believe that this process would not remove the segments which are in usage.

5 Replies
jbrar
Employee
Employee

Try to go through the logs and find the first entry for segmentnotfound. Analyze 10-15 lines before the segmentnotfound error and you can see which request caused this issue.

tanyakapila
Employee
Employee

Hi venkateshs73486425 ,

A SegmentNotFoundException is returned when a segment is not present while any activity attempts to read the node. There can be different root causes for this:

1.The segment has been removed by manual intervention (e.g. rm -rf /).

2.The segment has been removed by revision garbage collection.

3.The segment cannot be found due to some bug in the code.

We had some issues with online tar compaction with 6.2 & early versions. We even advised to disable online tar compaction in <6.3 . The documents you might have referred might be for previous versions.

hamidk92094312
Employee
Employee

there are variety if reasons for this situation. It might be caused due to long running JCR sessions along with online compaction [1]. It can be caused by some older issues in Oak [2], ... etc. So the logs should shed some lights on the probable cause(s).

[1] Fix Inconsistencies by restarting AEM when SegmentNotFound Issue is reported in AEM 6.3

[2] Fix Inconsistencies in the repository when SegmentNotFound Issue is reported in AEM 6.x

jbrar
Employee
Employee

Listing the common reasons for Segmentnotfound:

  • Unclean shutdown Or Force Shutdown using the kill command
  • AEM instance running out of memory
  • Antivirus updating the tar files. You need to exclude "crx-quickstart" from antivirus scan.
  • An issue with the disk where the segment is stored as tar file.
SonDang
Employee
Employee

If none of these possibilities could explain why you got the SNFE, I would recommend opening a ticket with the support team to assist further. If you have a reproducible scenario, it would be even better.