Public

calculateShouldScan

<init>

Disallow the scanner from scanning the given block pool.

disableBlockPoolId

Allow the scanner to scan the given block pool.

enableBlockPoolId

expireOldScannedBytesRecords

Find a usable block iterator. We will consider available block iterators in
order. This property is 

findNextUsableBlockIter

getStatistics

interrupt

markSuspectBlock

If there are elements in the suspectBlocks list, removes and returns the first
one. Otherwise, retur

popNextSuspectBlock

positiveMsToHours

printStats

Run an iteration of the VolumeScanner loop.

runLoop

saveBlockIterator

scanBlock

setConf

setDaemon

setName

shutdown

start

VolumeScanner

Finding current android device location

This class implements a simple HTTP server. A HttpServer is bound to an IP
address and port number a

com.sun.net.httpserver.HttpServer

 Stack is a Last-In/First-Out(LIFO) data structure which represents a stack of
objects. It enables u

java.util.Stack

TreeSet is an implementation of SortedSet. All optional operations (adding and
removing) are support

java.util.TreeSet

javax.swing.JLabel

XPath provides access to the XPath evaluation environment and expressions.

Evaluation of XPath Expr

javax.xml.xpath.XPath

Class that models an arbitrary location in a Resource.Typically used to track
the location of proble

org.springframework.beans.factory.parsing.Location

setContentView

setRequestProperty

Return the contained value, if present, otherwise throw an exception to be
created by the provided s

orElseThrow

// Record the minute on which the scanner started.

// Take the lock to check if we should stop, and access the

// We are exiting because of an InterruptedException,

// probably sent by VolumeScanner#shutdown.

"{} exiting because of InterruptedException."

// Save the current position of all block iterators and close them.

// When the VolumeScanner exits, release the reference we were holding

// on the volume.  This will allow the volume to be removed later.

/**
   * Run an iteration of the VolumeScanner loop.
   *
   * @param suspectBlock   A suspect block which we should scan, or null to
   *                       scan the next regularly scheduled block.
   *
   * @return     The number of milliseconds to delay before running the loop
   *               again, or 0 to re-run the loop immediately.
   */

// If neededBytesPerSec is too low, then wait few seconds for some old

"{}: no block pools are ready to scan yet.  Waiting "

// There was an error listing the next block in the volume.  This is a

// On the next loop iteration, curBlockIter#eof will be set to true, and

// we will pick a different block iterator.

"{}: saving block iterator {} after {} ms."

How to use saveBlockIteratormethodin org.apache.hadoop.hdfs.server.datanode.VolumeScanner

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How to use
saveBlockIterator
method
in
org.apache.hadoop.hdfs.server.datanode.VolumeScanner