jojochuang commented on a change in pull request #1028: HDFS-14617 - Improve
fsimage load time by writing sub-sections to the fsimage index
URL: https://github.com/apache/hadoop/pull/1028#discussion_r311836374
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormatPBINode.java
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@@ -217,33 +273,151 @@ void loadINodeDirectorySection(InputStream in) throws
IOException {
INodeDirectory p = dir.getInode(e.getParent()).asDirectory();
for (long id : e.getChildrenList()) {
INode child = dir.getInode(id);
- addToParent(p, child);
+ if (addToParent(p, child)) {
+ if (child.isFile()) {
+ inodeList.add(child);
+ }
+ if (inodeList.size() >= 1000) {
+ addToCacheAndBlockMap(inodeList);
+ inodeList.clear();
+ }
+ }
+
}
+
for (int refId : e.getRefChildrenList()) {
INodeReference ref = refList.get(refId);
- addToParent(p, ref);
+ if (addToParent(p, ref)) {
+ if (ref.isFile()) {
+ inodeList.add(ref);
+ }
+ if (inodeList.size() >= 1000) {
+ addToCacheAndBlockMap(inodeList);
+ inodeList.clear();
+ }
+ }
}
}
+ addToCacheAndBlockMap(inodeList);
+ }
+
+ private void addToCacheAndBlockMap(ArrayList<INode> inodeList) {
+ try {
+ cacheNameMapLock.lock();
+ for (INode i : inodeList) {
+ dir.cacheName(i);
+ }
+ } finally {
+ cacheNameMapLock.unlock();
+ }
+
+ try {
+ blockMapLock.lock();
+ for (INode i : inodeList) {
+ updateBlocksMap(i.asFile(), fsn.getBlockManager());
+ }
+ } finally {
+ blockMapLock.unlock();
+ }
}
void loadINodeSection(InputStream in, StartupProgress prog,
Step currentStep) throws IOException {
- INodeSection s = INodeSection.parseDelimitedFrom(in);
- fsn.dir.resetLastInodeId(s.getLastInodeId());
- long numInodes = s.getNumInodes();
- LOG.info("Loading " + numInodes + " INodes.");
- prog.setTotal(Phase.LOADING_FSIMAGE, currentStep, numInodes);
+ loadINodeSectionHeader(in, prog, currentStep);
Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, currentStep);
- for (int i = 0; i < numInodes; ++i) {
+ int totalLoaded = loadINodesInSection(in, counter);
+ LOG.info("Successfully loaded {} inodes", totalLoaded);
+ }
+
+ private int loadINodesInSection(InputStream in, Counter counter)
+ throws IOException {
+ // As the input stream is a LimitInputStream, the reading will stop when
+ // EOF is encountered at the end of the stream.
+ int cntr = 0;
+ while (true) {
INodeSection.INode p = INodeSection.INode.parseDelimitedFrom(in);
+ if (p == null) {
+ break;
+ }
if (p.getId() == INodeId.ROOT_INODE_ID) {
- loadRootINode(p);
+ synchronized(this) {
Review comment:
as long as there's no lock contention, the overhead of locking is usually
very low.
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