Public

Create an object with a data input stream and a checksum input stream.

<init>

getChecksumIn

getDataIn

closeChecksumStream

closeStreams

dropCacheBehindReads

getDataInFd

getVolumeRef

readChecksumFully

readDataFully

skipChecksumFully

skipDataFully

ReplicaInputStreams

Updating database using SQL prepared statement

This class is used to encode a string using the format required by
application/x-www-form-urlencoded

java.net.URLEncoder

A class which can consume and produce dates in SQL Date format. Dates are
represented in SQL as yyyy

java.sql.Date

A task that can be scheduled for one-time or repeated execution by a Timer.

java.util.TimerTask

The Manifest class is used to obtain attribute information for a JarFile and its
entries.

java.util.jar.Manifest

Reflections one-stop-shop objectReflections scans your classpath, indexes the
metadata, allows you t

org.reflections.Reflections

The main user interface to logging. It is expected that logging takes place
through concrete impleme

org.slf4j.Logger

addToBackStack

putExtra

Compares this BigDecimal with the specified BigDecimal. Two BigDecimal objects
that are equal in val

compareTo

// Advise that this file descriptor will be accessed sequentially.

// Trigger readahead of beginning of file if configured.

// Smaller packet size to only hold checksum when doing transferTo

// Packet size includes both checksum and data

// If this thread was interrupted, then it did not send the full block.

// send an empty packet to mark the end of the block

/**
   * Sends a packet with up to maxChunks chunks of data.
   * 
   * @param pkt buffer used for writing packet data
   * @param maxChunks maximum number of chunks to send
   * @param out stream to send data to
   * @param transferTo use transferTo to send data
   * @param throttler used for throttling data transfer bandwidth
   */

// Number of chunks be sent in the packet

// The packet buffer is organized as follows:

// _ padding, since the header is variable-length

// Per above, the header doesn't start at the beginning of the

// write in progress that we need to use to get last checksum

// no need to flush since we know out is not a buffered stream

/*
         * writing to client timed out.  This happens if the client reads
         * part of a block and then decides not to read the rest (but leaves
         * the socket open).
         * 
         * Reporting of this case is done in DataXceiver#run
         */

/* Exception while writing to the client. Connection closure from
         * the other end is mostly the case and we do not care much about
         * it. But other things can go wrong, especially in transferTo(),
         * which we do not want to ignore.
         *
         * The message parsing below should not be considered as a good
         * coding example. NEVER do it to drive a program logic. NEVER.
         * It was done here because the NIO throws an IOException for EPIPE.
         */

/**
   * reads in the partial crc chunk and computes checksum
   * of pre-existing data in partial chunk.
   */

// find offset of the beginning of partial chunk.

// create an input stream from the block file

// and read in partial crc chunk into temporary buffer

// open meta file and read in crc value computer earlier

// compute crc of partial chunk from data read in the block file.

"Read in partial CRC chunk from disk for "

// paranoia! verify that the pre-computed crc matches what we

How to use getDataInmethodin org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaInputStreams

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How to use
getDataIn
method
in
org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaInputStreams