| Package | Description | 
|---|---|
| org.apache.hadoop.fs | Implementations of  AbstractFileSystemfor hdfs
    over rpc and hdfs over web. | 
| org.apache.hadoop.fs.statistics | This package contains support for statistic collection and reporting. | 
| org.apache.hadoop.io.compress | |
| org.apache.hadoop.io.wrappedio | Support for dynamic access to filesystem operations which are not available
 in older hadoop releases. | 
| org.apache.hadoop.mapreduce.lib.output | |
| org.apache.hadoop.mapreduce.lib.output.committer.manifest.files | Persistence formats. | 
| Class and Description | 
|---|
| IOStatistics IO Statistics. | 
| Class and Description | 
|---|
| DurationStatisticSummary Summary of duration tracking statistics
 as extracted from an IOStatistics instance. | 
| IOStatistics IO Statistics. | 
| IOStatisticsAggregator Interface exported by classes which support
 aggregation of  IOStatistics. | 
| IOStatisticsSetters Setter for IOStatistics entries. | 
| IOStatisticsSnapshot Snapshot of statistics from a different source. | 
| MeanStatistic A mean statistic represented as the sum and the sample count;
 the mean is calculated on demand. | 
| Class and Description | 
|---|
| IOStatistics IO Statistics. | 
| Class and Description | 
|---|
| IOStatisticsSnapshot Snapshot of statistics from a different source. | 
| Class and Description | 
|---|
| IOStatistics IO Statistics. | 
| Class and Description | 
|---|
| IOStatistics IO Statistics. | 
| IOStatisticsSnapshot Snapshot of statistics from a different source. | 
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