/**
* recoverTransitionRead for a specific block pool
*
* @param datanode DataNode
* @param bpID Block pool Id
* @param nsInfo Namespace info of namenode corresponding to the block pool
* @param dataDirs Storage directories
* @param startOpt startup option
* @throws IOException on error
*/
void recoverTransitionRead(
DataNode datanode,
String bpID,
NamespaceInfo nsInfo,
Collection<File> dataDirs,
StartupOption startOpt)
throws IOException {
// First ensure datanode level format/snapshot/rollback is completed
recoverTransitionRead(datanode, nsInfo, dataDirs, startOpt);
// Create list of storage directories for the block pool
Collection<File> bpDataDirs = new ArrayList<File>();
for (Iterator<File> it = dataDirs.iterator(); it.hasNext(); ) {
File dnRoot = it.next();
File bpRoot = BlockPoolSliceStorage.getBpRoot(bpID, new File(dnRoot, STORAGE_DIR_CURRENT));
bpDataDirs.add(bpRoot);
}
// mkdir for the list of BlockPoolStorage
makeBlockPoolDataDir(bpDataDirs, null);
BlockPoolSliceStorage bpStorage =
new BlockPoolSliceStorage(
nsInfo.getNamespaceID(), bpID, nsInfo.getCTime(), nsInfo.getClusterID());
bpStorage.recoverTransitionRead(datanode, nsInfo, bpDataDirs, startOpt);
addBlockPoolStorage(bpID, bpStorage);
}
/**
* Upgrade -- Move current storage into a backup directory, and hardlink all its blocks into the
* new current directory.
*
* <p>Upgrade from pre-0.22 to 0.22 or later release e.g. 0.19/0.20/ => 0.22/0.23
*
* <ul>
* <li>If <SD>/previous exists then delete it
* <li>Rename <SD>/current to <SD>/previous.tmp
* <li>Create new <SD>/current/<bpid>/current directory
* <li>
* <ul>
* <li>Hard links for block files are created from <SD>/previous.tmp to
* <SD>/current/<bpid>/current
* <li>Saves new version file in <SD>/current/<bpid>/current directory
* </ul>
* <li>Rename <SD>/previous.tmp to <SD>/previous
* </ul>
*
* There should be only ONE namenode in the cluster for first time upgrade to 0.22
*
* @param sd storage directory
* @throws IOException on error
*/
void doUpgrade(StorageDirectory sd, NamespaceInfo nsInfo) throws IOException {
if (LayoutVersion.supports(Feature.FEDERATION, layoutVersion)) {
clusterID = nsInfo.getClusterID();
layoutVersion = nsInfo.getLayoutVersion();
writeProperties(sd);
return;
}
LOG.info(
"Upgrading storage directory "
+ sd.getRoot()
+ ".\n old LV = "
+ this.getLayoutVersion()
+ "; old CTime = "
+ this.getCTime()
+ ".\n new LV = "
+ nsInfo.getLayoutVersion()
+ "; new CTime = "
+ nsInfo.getCTime());
File curDir = sd.getCurrentDir();
File prevDir = sd.getPreviousDir();
File bbwDir = new File(sd.getRoot(), Storage.STORAGE_1_BBW);
assert curDir.exists() : "Data node current directory must exist.";
// Cleanup directory "detach"
cleanupDetachDir(new File(curDir, STORAGE_DIR_DETACHED));
// 1. delete <SD>/previous dir before upgrading
if (prevDir.exists()) deleteDir(prevDir);
// get previous.tmp directory, <SD>/previous.tmp
File tmpDir = sd.getPreviousTmp();
assert !tmpDir.exists() : "Data node previous.tmp directory must not exist.";
// 2. Rename <SD>/current to <SD>/previous.tmp
rename(curDir, tmpDir);
// 3. Format BP and hard link blocks from previous directory
File curBpDir = BlockPoolSliceStorage.getBpRoot(nsInfo.getBlockPoolID(), curDir);
BlockPoolSliceStorage bpStorage =
new BlockPoolSliceStorage(
nsInfo.getNamespaceID(),
nsInfo.getBlockPoolID(),
nsInfo.getCTime(),
nsInfo.getClusterID());
bpStorage.format(curDir, nsInfo);
linkAllBlocks(tmpDir, bbwDir, new File(curBpDir, STORAGE_DIR_CURRENT));
// 4. Write version file under <SD>/current
layoutVersion = HdfsConstants.LAYOUT_VERSION;
clusterID = nsInfo.getClusterID();
writeProperties(sd);
// 5. Rename <SD>/previous.tmp to <SD>/previous
rename(tmpDir, prevDir);
LOG.info("Upgrade of " + sd.getRoot() + " is complete");
addBlockPoolStorage(nsInfo.getBlockPoolID(), bpStorage);
}