[Cassandra] Cassandra3修改MAX_HEAP_SIZE

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Cassandra集群频繁内存溢出报错，修改最大堆内存配置，保存后重启cassandra服务生效。

[root@cassandra-01 conf]# vi $CASSANDRA_HOME/conf/cassandra-env.sh
MAX_HEAP_SIZE="16G"    #两个参数要一起修改
HEAP_NEWSIZE="1600M"

重启Cassandra之后查看修改的配置是否生效可以使用下面的命令，也可以通过jconsole远程连接jmx的7199端口查看内存使用情况。

[root@cassandra2 ~]$ nodetool info
ID                     : 56b10922-cda9-4d6e-907c-fa84e0ad48e3
Gossip active          : true
Thrift active          : false
Native Transport active: true
Load                   : 278.73 KiB
Generation No          : 1546494200
Uptime (seconds)       : 17450
Heap Memory (MB)       : 1234.58 / 16224.00
Off Heap Memory (MB)   : 0.00
Data Center            : datacenter1
Rack                   : rack1
Exceptions             : 0
Key Cache              : entries 24, size 1.99 KiB, capacity 100 MiB, 88 hits, 113 requests, 0.779 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 0 bytes, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 0, size 0 bytes, capacity 50 MiB, 0 hits, 0 requests, NaN recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 13, size 832 KiB, capacity 480 MiB, 103 misses, 277 requests, 0.628 recent hit rate, NaN microseconds miss latency
Percent Repaired       : 0.0%
Token                  : (invoke with -T/--tokens to see all 256 tokens)
[root@cassandra2 ~]$