You may have better luck switching to G1GC and using a much larger heap (16 to 30GB). 4GB is likely too small for your amount of data, especially if you have a lot of sstables. Then try increasing file_cache_size_in_mb further.
Cheers, Mark On Tue, Mar 28, 2017 at 3:01 AM, Mokkapati, Bhargav (Nokia - IN/Chennai) <bhargav.mokkap...@nokia.com> wrote: > Hi Cassandra users, > > > > I am getting “Maximum memory usage reached (536870912 bytes), cannot > allocate chunk of 1048576 bytes” . As a remedy I have changed the off heap > memory usage limit cap i.e file_cache_size_in_mb parameter in cassandra.yaml > from 512 to 1024. > > > > But now again the increased limit got filled up and throwing a message > “Maximum memory usage reached (1073741824 bytes), cannot allocate chunk of > 1048576 bytes” > > > > This issue occurring when redistribution of index’s happening ,due to this > Cassandra nodes are still UP but read requests are getting failed from > application side. > > > > My configuration details are as below: > > > > 5 node cluster , each node with 68 disks, each disk is 3.7 TB > > > > Total CPU cores - 8 > > > > total Mem: 377G > > used 265G > > free 58G > > shared 378M > > buff/cache 53G > > available 104G > > > > MAX_HEAP_SIZE is 4GB > > file_cache_size_in_mb: 1024 > > > > memtable heap space is commented in yaml file as below: > > # memtable_heap_space_in_mb: 2048 > > # memtable_offheap_space_in_mb: 2048 > > > > Can anyone please suggest the solution for this issue. Thanks in advance ! > > > > Thanks, > > Bhargav M > > > > > > > >
