我正在尝试使用 Apache Pig Latin 进行一些日志处理,我想知道是否有更简单的方法可以做到这一点:
filtered_logs = FOREACH logs GENERATE numDay, reqSize, optimizedSize, origSize, compressionPct, cacheStatus;
grouped_logs = GROUP filtered_logs BY numDay;
results = FOREACH grouped_logs GENERATE group,
(SUM(filtered_logs.reqSize) + SUM(filtered_logs.optimizedSize)) / 1048576.00 AS ClientThroughputMB,
(SUM(filtered_logs.reqSize) + SUM(filtered_logs.origSize)) / 1048576.00 AS ServerThroughputMB,
SUM(filtered_logs.origSize) / 1048576.00 AS OrigMB,
SUM(filtered_logs.optimizedSize) / 1048576.00 AS OptMB,
SUM(filtered_logs.reqSize) / 1048576.00 AS SentMB,
AVG(filtered_logs.compressionPct) AS CompressionAvg,
COUNT(filtered_logs) AS NumLogs;
cache_hit_logs = FILTER filtered_logs BY cacheStatus MATCHES '.*HIT.*';
grouped_cache_hit_logs = GROUP cache_hit_logs BY numDay;
cache_hits = FOREACH grouped_cache_hit_logs GENERATE group,
COUNT(cache_hit_logs) AS cnt;
final_results = JOIN results BY group, cache_hits BY group;
DUMP final_results;
(定义了日志,它基本上是读取管道分隔的日志文件并分配字段)
我在这里要做的是计算字段 cacheStatus 包含“HIT”的实例数,并计算其他数据,例如 OrigMB、CompressionAvg、NumLogs 等。当前的代码有效,但似乎有巨大的性能高架。Pig Latin 有没有办法按照这个思路做一些事情(在 MSSQL 中)?
SUM(CASE CacheStatus WHEN 'HIT' THEN 1 else 0 END) as CacheHit
(基本上,我不想多次处理日志,我宁愿一次完成)
抱歉,如果我的问题措辞令人困惑,我对 Pig Latin 还是很陌生。