Public

<init>

Cleanup a partial block if this write is for a replication request (and not from
a client)

cleanupBlock

close files and release volume reference.

close

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

computePartialChunkCrc

While writing to mirrorOut, failure to write to mirror should not affect this
datanode unless it is 

handleMirrorOutError

receiveBlock

Receives and processes a packet. It can contain many chunks. returns the number
of data bytes that t

receivePacket

verifyChunks

Adjust the file pointer in the local meta file so that the last checksum will be
overwritten.

adjustCrcFilePosition

checksum2long

The caller claims the ownership of the replica handler.

claimReplicaHandler

copyLastChunkChecksum

Flush block data and metadata files to disk.

flushOrSync

getReplica

manageWriterOsCache

It can return false if - upstream did not send packet for a long time - a packet
was received but go

packetSentInTime

sendOOB

setLastSentTime

Check whether checksum needs to be verified. Skip verifying checksum iff this is
not the last one in

shouldVerifyChecksum

Translate CRC chunks from the client's checksum implementation to the disk
checksum implementation. 

translateChunks

OutputStreamWriter

Updating database using SQL prepared statement

java.security.Permission

SortedSet is a Set which iterates over its elements in a sorted order. The order
is determined eithe

java.util.SortedSet

A Handler object accepts a logging request and exports the desired messages to a
target, for example

java.util.logging.Handler

A sequence of elements supporting sequential and parallel aggregate operations.
The following exampl

java.util.stream.Stream

XPath provides access to the XPath evaluation environment and expressions.

Evaluation of XPath Expr

javax.xml.xpath.XPath

Operations on java.lang.String that arenull safe.

 * IsEmpty/IsBlank - checks if a String contains 

org.apache.commons.lang.StringUtils

compareTo

getContentResolver

scheduleAtFixedRate

/** 
   * Receives and processes a packet. It can contain many chunks.
   * returns size of the packet.
   */

"Data remaining in packet does not match "

/* skip verifying checksum iff this is not the last one in the 
       * pipeline and clientName is non-null. i.e. Checksum is verified
       * on all the datanodes when the data is being written by a 
       * datanode rather than a client. Whe client is writing the data, 
       * protocol includes acks and only the last datanode needs to verify 
       * checksum.
       */

// If this is a partial chunk, then verify that this is the only

// chunk in the packet. Calculate new crc for this chunk.

"A packet can have only one partial chunk."

/// flush entire packet before sending ack

"Thread interrupted when flushing bytes to disk. Might cause inconsistent sates"

"InterruptedIOException when flushing bytes to disk. Might cause inconsistent sates"

How to use setBlockPositionmethodin org.apache.hadoop.hdfs.server.datanode.BlockReceiver

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How to use
setBlockPosition
method
in
org.apache.hadoop.hdfs.server.datanode.BlockReceiver