org.apache.cassandra.io.sstable

Class SSTableRewriter

java.lang.Object

org.apache.cassandra.io.sstable.SSTableRewriter

public class SSTableRewriter
extends java.lang.Object

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.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	abort()
RowIndexEntry	append(AbstractCompactedRow row)
SSTableWriter	currentWriter()
java.util.List<SSTableReader>	finish()
java.util.List<SSTableReader>	finish(long repairedAt) Finishes the new file(s) Creates final files, adds the new files to the dataTracker (via replaceReader).
void	switchWriter(SSTableWriter newWriter)
RowIndexEntry	tryAppend(AbstractCompactedRow row)

Methods inherited from class java.lang.Object

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

Constructor Detail

SSTableRewriter

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

SSTableRewriter

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

SSTableRewriter

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

Method Detail

currentWriter

public SSTableWriter currentWriter()

append

public RowIndexEntry append(AbstractCompactedRow row)

tryAppend

public RowIndexEntry tryAppend(AbstractCompactedRow row)

abort

public void abort()

switchWriter

public void switchWriter(SSTableWriter newWriter)

finish

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

finish

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

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(..))

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.