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What are Hadoop commands for Get and Merge?

Spark/Big Dataeasy0.4 min read

**Get**: `hadoop fs -get /hdfs/path /local/path` — copies file/dir from HDFS to local. `-ignoreCrc` skips checksum (use cautiously). **Getmerge**: `hadoop fs -getmerge /hdfs/dir /local/merged_file` — concatenates all files in HDFS dir into one local file. `-nl` adds newline...

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Frequency
Low
Asked at 1 company
Category
452
questions in Spark/Big Data
Difficulty Split
88E|81M|283H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Altimetrik
Key Concepts Tested
spark

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Expert Answer
89 words

Get: hadoop fs -get /hdfs/path /local/path — copies file/dir from HDFS to local. -ignoreCrc skips checksum (use cautiously).

Getmerge: hadoop fs -getmerge /hdfs/dir /local/merged_file — concatenates all files in HDFS dir into one local file. -nl adds newline between files.

Why Use: Export query results, consolidate small files for single-file consumer. Not for in-place HDFS merge of huge data.

Scalability Trade-offs: getmerge streams through client; large dirs can bottleneck. For TB-scale, use Spark or DistCP.

Cost Implications: get/getmerge run on client—ensure sufficient disk. Prefer cloud-native (S3/ADLS) copy for cross-region.

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