Github user luchesar commented on the pull request:
https://github.com/apache/spark/pull/2883#issuecomment-60047780
I have a Linux box with encrypted home folder on ext4 File system. Ext4's
max file name length is 255 bytes.
scalac will generate class file names like that for closures.
CurrencyInitializer$$anonfun$com$gottex$gottware$server$startup$initializers$impl$currency$CurrencyInitializer$$updateDepositEquivalentBonds$1.class
On encrypted files system the file names get encrypted and get much longer
then usual. This leads to failing build for me on my my machine and a quick
search showed other people are experiencing the same problem.
Setting -Xmax-classfile-name scalac parameter tells scalac to generate
class file names with length at max X bytes. I find 128 works very well for all
the projects I've worked for.
This is nice to have but not mandatory really, I just need to set these
every time I build Spark on my local machine plus I can build it on unencrypted
partition if I had one.
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