org.apache.cassandra.io.sstable

Class SSTableRewriter

java.lang.Object

org.apache.cassandra.utils.concurrent.Transactional.AbstractTransactional

org.apache.cassandra.io.sstable.SSTableRewriter

All Implemented Interfaces:

java.lang.AutoCloseable, Transactional

public class SSTableRewriter
extends Transactional.AbstractTransactional
implements Transactional

Wraps one or more writers as output for rewriting one or more readers: every sstable_preemptive_open_interval_in_mb we look in the summary we're collecting for the latest writer for the penultimate key that we know to have been fully flushed to the index file, and then double check that the key is fully present in the flushed data file. Then we move the starts of each reader forwards to that point, replace them in the datatracker, and attach a runnable for on-close (i.e. when all references expire) that drops the page cache prior to that key position hard-links are created for each partially written sstable so that readers opened against them continue to work past the rename of the temporary file, which is deleted once all readers against the hard-link have been closed. If for any reason the writer is rolled over, we immediately rename and fully expose the completed file in the DataTracker. On abort we restore the original lower bounds to the existing readers and delete any temporary files we had in progress, but leave any hard-links in place for the readers we opened to cleanup when they're finished as we would had we finished successfully.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.utils.concurrent.Transactional.AbstractTransactional

Transactional.AbstractTransactional.State

Nested classes/interfaces inherited from interface org.apache.cassandra.utils.concurrent.Transactional

Transactional.AbstractTransactional

Constructor Summary

Constructors

Constructor and Description
SSTableRewriter(ColumnFamilyStore cfs, java.util.Set<SSTableReader> rewriting, long maxAge, boolean isOffline)

Method Summary

Modifier and Type	Method and Description
RowIndexEntry	append(AbstractCompactedRow row)
SSTableWriter	currentWriter()
protected java.lang.Throwable	doAbort(java.lang.Throwable accumulate)
protected java.lang.Throwable	doCleanup(java.lang.Throwable accumulate)
protected java.lang.Throwable	doCommit(java.lang.Throwable accumulate)
protected void	doPrepare() Do any preparatory work prior to commit.
java.util.List<SSTableReader>	finish() Finishes the new file(s) Creates final files, adds the new files to the dataTracker (via replaceReader).
java.util.List<SSTableReader>	finished()
static long	getOpenInterval()
static void	overrideOpenInterval(long size)
SSTableRewriter	setRepairedAt(long repairedAt)
void	switchWriter(SSTableWriter newWriter)
RowIndexEntry	tryAppend(AbstractCompactedRow row)

Methods inherited from class org.apache.cassandra.utils.concurrent.Transactional.AbstractTransactional

abort, abort, close, commit, commit, prepareToCommit, state

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.cassandra.utils.concurrent.Transactional

abort, commit, prepareToCommit

Methods inherited from interface java.lang.AutoCloseable

close

Constructor Detail

SSTableRewriter

public SSTableRewriter(ColumnFamilyStore cfs,
                       java.util.Set<SSTableReader> rewriting,
                       long maxAge,
                       boolean isOffline)

Method Detail

overrideOpenInterval

public static void overrideOpenInterval(long size)

getOpenInterval

public static long getOpenInterval()

currentWriter

public SSTableWriter currentWriter()

append

public RowIndexEntry append(AbstractCompactedRow row)

tryAppend

public RowIndexEntry tryAppend(AbstractCompactedRow row)

doAbort

protected java.lang.Throwable doAbort(java.lang.Throwable accumulate)

Specified by:

doAbort in class Transactional.AbstractTransactional

doCommit

protected java.lang.Throwable doCommit(java.lang.Throwable accumulate)

Specified by:

doCommit in class Transactional.AbstractTransactional

doCleanup

protected java.lang.Throwable doCleanup(java.lang.Throwable accumulate)

Specified by:

doCleanup in class Transactional.AbstractTransactional

switchWriter

public void switchWriter(SSTableWriter newWriter)

setRepairedAt

public SSTableRewriter setRepairedAt(long repairedAt)

Parameters:

repairedAt - the repair time, -1 if we should use the time we supplied when we created the SSTableWriter (and called rewriter.switchWriter(..)), actual time if we want to override the repair time.

finish

public java.util.List<SSTableReader> finish()

Finishes the new file(s) Creates final files, adds the new files to the dataTracker (via replaceReader). We add them to the tracker to be able to get rid of the tmpfiles It is up to the caller to do the compacted sstables replacement gymnastics (ie, call DataTracker#markCompactedSSTablesReplaced(..))

Overrides:

finish in class Transactional.AbstractTransactional

finished

public java.util.List<SSTableReader> finished()

doPrepare

protected void doPrepare()

Description copied from class: Transactional.AbstractTransactional

Do any preparatory work prior to commit. This method should throw any exceptions that can be encountered during the finalization of the behaviour.

Specified by:

doPrepare in class Transactional.AbstractTransactional