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Big Data > Learn Big Data > Why in Hadoop do we have default block size as 128...
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Why in Hadoop do we have default block size as 128 and replication as 3?

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The block size depends upon the Data structure its built with. The replication can be customised, the default replica is 3 in order to avoid data loss, you can increase or decrease based upon your serve size
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Because of HDFS it having Replication provides the Fault Tolerance.and replicato of data use to solve any problem of data which losss in unfavorable conditionsUnfavorable conditions are crashing of node, hardware failure and so on
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