February 2019
Beginner to intermediate
544 pages
14h 36m
English
Content preview from Mastering Hadoop 3
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File channel
The file channel is considered as a durable buffer for Flume. The events are written to disk and thus any failure, such as process failure, machine shutdown failure, or system crash may result in data loss. The durable file channel ensures that any events committed to it are not removed from channel until and unless sinks consumes the event and sends an acknowledgement to channel.
The file system can have multiple disks attached to it, which is abstract to channel, meaning that channel does not have direct information about it. The disks are mounted at different mount points and channels are configured to write data to directories on these disks in a round robin fashion, for example:
agent.channels.testfilechannel.type = file ...
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