[Cassandra] Mutation of bytes is too large for the maxiumum size of
[Cassandra] Mutation of
bytes is too large for the maxiumum size of
Q:
WARN [SharedPool-Worker-4] 2015-11-28 20:04:44,663 AbstractTracingAwareExecutorService.java:169 - Uncaught exception on thread Thread[SharedPool-Worker-4,5,main]: {} java.lang.IllegalArgumentException: Mutation of 28087887 bytes is too large for the maxiumum size of 16777216java
A:
简单讲是因为Cassandra发现你一次提交的数据太大了，也就是超过commitlog_segment_size_in_mb大小的50%，这个配置的默认值是32MB，若是一次提交的数据超过16MB就会出现这样的问题，尤为是经过batch提交大量数据时。这样作的目的是避免是做为一种保护措施，避免程序Bug致使数据破坏或者对系统形成不良影响。设计
解决方法之一是修改默认的commitlog_segment_size_in_mb大小，这样作其实不推荐，由于这样违背了设计的初衷，16MB的数据做为一个提交单元已经不小了。
更好的方式是去排查为何会一次提交这么多数据，若是肯定没问题，那么请分批提交这些数据。code
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