Cassandra : java.lang.OutOfMemoryError: Java heap space

问题

I am using cassandra 2.0.8 and getting this exception

INFO 16:44:50,132 Initializing system.batchlog
 INFO 16:44:50,138 Initializing system.sstable_activity
 INFO 16:44:50,142 Opening /var/lib/cassandra/data/system/sstable_activity/system-sstable_activity-jb-10 (826 bytes)
 INFO 16:44:50,142 Opening /var/lib/cassandra/data/system/sstable_activity/system-sstable_activity-jb-9 (827 bytes)
 INFO 16:44:50,142 Opening /var/lib/cassandra/data/system/sstable_activity/system-sstable_activity-jb-11 (825 bytes)
 INFO 16:44:50,150 reading saved cache /var/lib/cassandra/saved_caches/system-sstable_activity-KeyCache-b.db
java.lang.OutOfMemoryError: Java heap space
Dumping heap to java_pid3460.hprof ...
Heap dump file created [13378724 bytes in 0.071 secs]
ERROR 16:44:50,333 Exception encountered during startup
java.lang.OutOfMemoryError: Java heap space
    at java.util.ArrayList.<init>(ArrayList.java:144)
    at org.apache.cassandra.db.RowIndexEntry$Serializer.deserialize(RowIndexEntry.java:120)
    at org.apache.cassandra.service.CacheService$KeyCacheSerializer.deserialize(CacheService.java:365)
    at org.apache.cassandra.cache.AutoSavingCache.loadSaved(AutoSavingCache.java:119)
    at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:262)
    at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:421)
    at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:392)
    at org.apache.cassandra.db.Keyspace.initCf(Keyspace.java:309)
    at org.apache.cassandra.db.Keyspace.<init>(Keyspace.java:266)
    at org.apache.cassandra.db.Keyspace.open(Keyspace.java:110)
    at org.apache.cassandra.db.Keyspace.open(Keyspace.java:88)
    at org.apache.cassandra.db.SystemKeyspace.checkHealth(SystemKeyspace.java:536)
    at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:261)
    at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:496)
    at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:585)
java.lang.OutOfMemoryError: Java heap space
    at java.util.ArrayList.<init>(ArrayList.java:144)
    at org.apache.cassandra.db.RowIndexEntry$Serializer.deserialize(RowIndexEntry.java:120)
    at org.apache.cassandra.service.CacheService$KeyCacheSerializer.deserialize(CacheService.java:365)
    at org.apache.cassandra.cache.AutoSavingCache.loadSaved(AutoSavingCache.java:119)
    at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:262)
    at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:421)
    at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:392)
    at org.apache.cassandra.db.Keyspace.initCf(Keyspace.java:309)
    at org.apache.cassandra.db.Keyspace.<init>(Keyspace.java:266)
    at org.apache.cassandra.db.Keyspace.open(Keyspace.java:110)
    at org.apache.cassandra.db.Keyspace.open(Keyspace.java:88)
    at org.apache.cassandra.db.SystemKeyspace.checkHealth(SystemKeyspace.java:536)
    at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:261)
    at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:496)
    at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:585)
Exception encountered during startup: Java heap space

Can anyone tell me the reason and solution:

回答1:

Reach out to cassandra/conf/cassandra-env.sh location

Check out the current heap size You can assign at max of 1/2 RAM to the HEAP

#MAX_HEAP_SIZE="4G" 
#HEAP_NEWSIZE="800M"

if you are changing your current heap-size then remove comment..

MAX_HEAP_SIZE="4G"
HEAP_NEWSIZE="800M"

回答2:

Its possible your key cache is taking up too much space (since thats where it died) but it seems unlikely. You can try to delete your KeyCache before starting

/var/lib/cassandra/saved_caches

and set

key_cache_size_in_mb: 0

in your cassandra.yaml as a test (I would not recommend this permanently) to have it disabled.

You can actually determine whats filling up your heap by opening up the java_pid3460.hprof file it created in yourkit or some heap analyzer to determine whats taking up the space. There may be something funny going on, very strange to be dying at 13mb or so (size of heap).

回答3:

Delete all log files in usr/local/var/lib/cassandra/commitlog/ and restart Cassandra.

来源：https://stackoverflow.com/questions/25664128/cassandra-java-lang-outofmemoryerror-java-heap-space