Mailing List Archive

Hello all,
I am using Lucene 4.10.4 in our custom software and faced a long-running GC
while searching in an index.

I have attached the thread dump below

*Index details*:
Size of index = 7.8 GB
Largest file size = 4.266GB (_0.fdt segment file)

Results hit for the search query --> 4M records

*Server RAM size*: 64 GB
*Allotted heap size*: 16GB

Due to this long-running GC, subsequent search calls to this server have
failed.

What can be the possible cause for this?
Is this due to the larger segments? (We have a minimal number of segments
in our index)
If so, can you pls suggest to us the ideal index size and the number of
segments?

Thanks and Regards,
Raahul