private synchronized IndexReader doOpenNoWriter(final boolean openReadOnly, IndexCommit commit)
throws CorruptIndexException, IOException {
if (commit == null) {
if (hasChanges) {
// We have changes, which means we are not readOnly:
assert readOnly == false;
// and we hold the write lock:
assert writeLock != null;
// so no other writer holds the write lock, which
// means no changes could have been done to the index:
assert isCurrent();
if (openReadOnly) {
return clone(openReadOnly);
} else {
return null;
}
} else if (isCurrent()) {
if (openReadOnly != readOnly) {
// Just fallback to clone
return clone(openReadOnly);
} else {
return null;
}
}
} else {
if (directory != commit.getDirectory()) {
throw new IOException("the specified commit does not match the specified Directory");
}
if (segmentInfos != null
&& commit.getSegmentsFileName().equals(segmentInfos.getCurrentSegmentFileName())) {
if (readOnly != openReadOnly) {
// Just fallback to clone
return clone(openReadOnly);
} else {
return null;
}
}
}
return (IndexReader)
new SegmentInfos.FindSegmentsFile(directory) {
@Override
protected Object doBody(String segmentFileName)
throws CorruptIndexException, IOException {
SegmentInfos infos = new SegmentInfos();
infos.read(directory, segmentFileName);
return doOpenIfChanged(infos, false, openReadOnly);
}
}.run(commit);
}
/** Run {@link #doBody} on the provided commit. */
public T run(IndexCommit commit) throws IOException {
if (commit != null) {
if (directory != commit.getDirectory())
throw new IOException("the specified commit does not match the specified Directory");
return doBody(commit.getSegmentsFileName());
}
long lastGen = -1;
long gen = -1;
IOException exc = null;
// Loop until we succeed in calling doBody() without
// hitting an IOException. An IOException most likely
// means an IW deleted our commit while opening
// the time it took us to load the now-old infos files
// (and segments files). It's also possible it's a
// true error (corrupt index). To distinguish these,
// on each retry we must see "forward progress" on
// which generation we are trying to load. If we
// don't, then the original error is real and we throw
// it.
for (; ; ) {
lastGen = gen;
String files[] = directory.listAll();
String files2[] = directory.listAll();
Arrays.sort(files);
Arrays.sort(files2);
if (!Arrays.equals(files, files2)) {
// listAll() is weakly consistent, this means we hit "concurrent modification exception"
continue;
}
gen = getLastCommitGeneration(files);
if (infoStream != null) {
message("directory listing gen=" + gen);
}
if (gen == -1) {
throw new IndexNotFoundException(
"no segments* file found in " + directory + ": files: " + Arrays.toString(files));
} else if (gen > lastGen) {
String segmentFileName =
IndexFileNames.fileNameFromGeneration(IndexFileNames.SEGMENTS, "", gen);
try {
T t = doBody(segmentFileName);
if (infoStream != null) {
message("success on " + segmentFileName);
}
return t;
} catch (IOException err) {
// Save the original root cause:
if (exc == null) {
exc = err;
}
if (infoStream != null) {
message(
"primary Exception on '"
+ segmentFileName
+ "': "
+ err
+ "'; will retry: gen = "
+ gen);
}
}
} else {
throw exc;
}
}
}
public Object run(IndexCommit commit) throws CorruptIndexException, IOException {
if (commit != null) {
if (directory != commit.getDirectory())
throw new IOException("the specified commit does not match the specified Directory");
return doBody(commit.getSegmentsFileName());
}
String segmentFileName = null;
long lastGen = -1;
long gen = 0;
int genLookaheadCount = 0;
IOException exc = null;
int retryCount = 0;
boolean useFirstMethod = true;
// Loop until we succeed in calling doBody() without
// hitting an IOException. An IOException most likely
// means a commit was in process and has finished, in
// the time it took us to load the now-old infos files
// (and segments files). It's also possible it's a
// true error (corrupt index). To distinguish these,
// on each retry we must see "forward progress" on
// which generation we are trying to load. If we
// don't, then the original error is real and we throw
// it.
// We have three methods for determining the current
// generation. We try the first two in parallel (when
// useFirstMethod is true), and fall back to the third
// when necessary.
while (true) {
if (useFirstMethod) {
// List the directory and use the highest
// segments_N file. This method works well as long
// as there is no stale caching on the directory
// contents (NOTE: NFS clients often have such stale
// caching):
String[] files = null;
long genA = -1;
files = directory.listAll();
if (files != null) {
genA = getCurrentSegmentGeneration(files);
}
if (infoStream != null) {
message("directory listing genA=" + genA);
}
// Also open segments.gen and read its
// contents. Then we take the larger of the two
// gens. This way, if either approach is hitting
// a stale cache (NFS) we have a better chance of
// getting the right generation.
long genB = -1;
for (int i = 0; i < defaultGenFileRetryCount; i++) {
IndexInput genInput = null;
try {
genInput = directory.openInput(IndexFileNames.SEGMENTS_GEN);
} catch (FileNotFoundException e) {
if (infoStream != null) {
message("segments.gen open: FileNotFoundException " + e);
}
break;
} catch (IOException e) {
if (infoStream != null) {
message("segments.gen open: IOException " + e);
}
}
if (genInput != null) {
try {
int version = genInput.readInt();
if (version == FORMAT_LOCKLESS) {
long gen0 = genInput.readLong();
long gen1 = genInput.readLong();
if (infoStream != null) {
message("fallback check: " + gen0 + "; " + gen1);
}
if (gen0 == gen1) {
// The file is consistent.
genB = gen0;
break;
}
}
} catch (IOException err2) {
// will retry
} finally {
genInput.close();
}
}
try {
Thread.sleep(defaultGenFileRetryPauseMsec);
} catch (InterruptedException ie) {
throw new ThreadInterruptedException(ie);
}
}
if (infoStream != null) {
message(IndexFileNames.SEGMENTS_GEN + " check: genB=" + genB);
}
// Pick the larger of the two gen's:
if (genA > genB) gen = genA;
else gen = genB;
if (gen == -1) {
// Neither approach found a generation
throw new IndexNotFoundException(
"no segments* file found in " + directory + ": files: " + Arrays.toString(files));
}
}
if (useFirstMethod && lastGen == gen && retryCount >= 2) {
// Give up on first method -- this is 3rd cycle on
// listing directory and checking gen file to
// attempt to locate the segments file.
useFirstMethod = false;
}
// Second method: since both directory cache and
// file contents cache seem to be stale, just
// advance the generation.
if (!useFirstMethod) {
if (genLookaheadCount < defaultGenLookaheadCount) {
gen++;
genLookaheadCount++;
if (infoStream != null) {
message("look ahead increment gen to " + gen);
}
} else {
// All attempts have failed -- throw first exc:
throw exc;
}
} else if (lastGen == gen) {
// This means we're about to try the same
// segments_N last tried.
retryCount++;
} else {
// Segment file has advanced since our last loop
// (we made "progress"), so reset retryCount:
retryCount = 0;
}
lastGen = gen;
segmentFileName = IndexFileNames.fileNameFromGeneration(IndexFileNames.SEGMENTS, "", gen);
try {
Object v = doBody(segmentFileName);
if (infoStream != null) {
message("success on " + segmentFileName);
}
return v;
} catch (IOException err) {
// Save the original root cause:
if (exc == null) {
exc = err;
}
if (infoStream != null) {
message(
"primary Exception on '"
+ segmentFileName
+ "': "
+ err
+ "'; will retry: retryCount="
+ retryCount
+ "; gen = "
+ gen);
}
if (gen > 1 && useFirstMethod && retryCount == 1) {
// This is our second time trying this same segments
// file (because retryCount is 1), and, there is
// possibly a segments_(N-1) (because gen > 1).
// So, check if the segments_(N-1) exists and
// try it if so:
String prevSegmentFileName =
IndexFileNames.fileNameFromGeneration(IndexFileNames.SEGMENTS, "", gen - 1);
final boolean prevExists;
prevExists = directory.fileExists(prevSegmentFileName);
if (prevExists) {
if (infoStream != null) {
message("fallback to prior segment file '" + prevSegmentFileName + "'");
}
try {
Object v = doBody(prevSegmentFileName);
if (infoStream != null) {
message("success on fallback " + prevSegmentFileName);
}
return v;
} catch (IOException err2) {
if (infoStream != null) {
message(
"secondary Exception on '"
+ prevSegmentFileName
+ "': "
+ err2
+ "'; will retry");
}
}
}
}
}
}
}
@Override
public Directory getDirectory() {
return cp.getDirectory();
}