Created question in FIWARE Q/A platform on 08-12-2015 at 11:12
Please, ANSWER this question AT http://stackoverflow.com/questions/34153740/cosmos-entered-safe-mode-again-no-read-no-write-no-update

Question:
Cosmos entered safe mode again. No read, no write, no update

Description:
We saw yesterday that public Cosmos instance had entered safe mode and we couldn't update, write or delete any file. And today we see we can't read - open any file.

When we tried to open a hadoop file we get this error:

Java HotSpot(TM) 64-Bit Server VM warning: Insufficient space for shared memory file:
/tmp/hsperfdata_jonmikel.alonso/22367
Try using the -Djava.io.tmpdir= option to select an alternate temp location.

Exception in thread "main" java.lang.NoClassDefFoundError: ___/tmp/hsperfdata_jonmikel/alonso/22379
Caused by: java.lang.ClassNotFoundException: ___.tmp.hsperfdata_jonmikel.alonso.22379
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: ___/tmp/hsperfdata_jonmikel.alonso/22379. Program will exit.

It seems this already happened before:

Fi-Ware Cosmos: Name node is in safe mode

SafeModeException at cosmos.lab.fi-ware.org