HBase compaction行为及触发条件

HBase compaction come in two varieties: minor and major.

for the minor:

将最新的几个小文件合成一个大文件。

何时合并行为发生?

当文件满足下面所有条件时,合并行为将发生:

1> 参与合并的文件个数 >= hbase.hstore.compaction.min (default is 3), 但最多不超过hbase.hstore.compaction.max(default is 10)

2> 参与合并的文件需满足的条件: 

文件大小 < hbase.hstore.compaction.max.size (default is Long.MAX_VALUE)

且,文件大小 < 所有创建日期比该文件大(新)的文件大小之和*1.2

文件大小 < hbase.hstore.compactoin.min.size(memstore flush size)

3> 文件选择的优先级

优先考虑老文件。

for the major:

将所有文件合并

Which compaction type is run is automatically determined when the compaction

check is executed。 The check is triggered either after a memstore has been flushed to

disk, after the compact or major_compact shell commands or corresponding API calls

have been invoked, or by a background thread.

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