PurgeTxnTest.java 文件源码

/**
 * Tests purge where the data directory contains old snapshots and data
 * logs, newest snapshots and data logs
 */
@Test
public void testSnapFilesLessThanToRetain() throws Exception {
    int nRecentCount = 4;
    int fileToPurgeCount = 2;
    AtomicInteger offset = new AtomicInteger(0);
    tmpDir = ClientBase.createTmpDir();
    File version2 = new File(tmpDir.toString(), "version-2");
    Assert.assertTrue("Failed to create version_2 dir:" + version2.toString(),
            version2.mkdir());
    List<File> snapsToPurge = new ArrayList<File>();
    List<File> logsToPurge = new ArrayList<File>();
    List<File> snaps = new ArrayList<File>();
    List<File> logs = new ArrayList<File>();
    createDataDirFiles(offset, fileToPurgeCount, false, version2, snapsToPurge,
            logsToPurge);
    createDataDirFiles(offset, nRecentCount, false, version2, snaps, logs);
    logs.add(logsToPurge.remove(0)); // log that precedes first retained snapshot is also retained

    /**
     * The newest log file preceding the oldest retained snapshot is not removed as it may
     * contain transactions newer than the oldest snapshot.
     */
    logsToPurge.remove(0);

    FileTxnSnapLog txnLog = new FileTxnSnapLog(tmpDir, tmpDir);
    PurgeTxnLog.purgeOlderSnapshots(txnLog, snaps.get(snaps.size() - 1));
    txnLog.close();
    verifyFilesAfterPurge(snapsToPurge, false);
    verifyFilesAfterPurge(logsToPurge, false);
    verifyFilesAfterPurge(snaps, true);
    verifyFilesAfterPurge(logs, true);
}