private boolean versionDelete(DeleteUpdateCommand cmd) throws IOException {
BytesRef idBytes = cmd.getIndexedId();
if (vinfo == null || idBytes == null) {
super.processDelete(cmd);
return false;
}
// This is only the hash for the bucket, and must be based only on the uniqueKey (i.e. do not
// use a pluggable hash here)
int bucketHash = Hash.murmurhash3_x86_32(idBytes.bytes, idBytes.offset, idBytes.length, 0);
// at this point, there is an update we need to try and apply.
// we may or may not be the leader.
// Find the version
long versionOnUpdate = cmd.getVersion();
if (versionOnUpdate == 0) {
String versionOnUpdateS = req.getParams().get(VERSION_FIELD);
versionOnUpdate = versionOnUpdateS == null ? 0 : Long.parseLong(versionOnUpdateS);
}
long signedVersionOnUpdate = versionOnUpdate;
versionOnUpdate = Math.abs(versionOnUpdate); // normalize to positive version
boolean isReplay = (cmd.getFlags() & UpdateCommand.REPLAY) != 0;
boolean leaderLogic = isLeader && !isReplay;
if (!leaderLogic && versionOnUpdate == 0) {
throw new SolrException(ErrorCode.BAD_REQUEST, "missing _version_ on update from leader");
}
VersionBucket bucket = vinfo.bucket(bucketHash);
vinfo.lockForUpdate();
try {
synchronized (bucket) {
if (versionsStored) {
long bucketVersion = bucket.highest;
if (leaderLogic) {
if (signedVersionOnUpdate != 0) {
Long lastVersion = vinfo.lookupVersion(cmd.getIndexedId());
long foundVersion = lastVersion == null ? -1 : lastVersion;
if ((signedVersionOnUpdate == foundVersion)
|| (signedVersionOnUpdate < 0 && foundVersion < 0)
|| (signedVersionOnUpdate == 1 && foundVersion > 0)) {
// we're ok if versions match, or if both are negative (all missing docs are equal),
// or if cmd
// specified it must exist (versionOnUpdate==1) and it does.
} else {
throw new SolrException(
ErrorCode.CONFLICT,
"version conflict for "
+ cmd.getId()
+ " expected="
+ signedVersionOnUpdate
+ " actual="
+ foundVersion);
}
}
long version = vinfo.getNewClock();
cmd.setVersion(-version);
bucket.updateHighest(version);
} else {
cmd.setVersion(-versionOnUpdate);
if (ulog.getState() != UpdateLog.State.ACTIVE
&& (cmd.getFlags() & UpdateCommand.REPLAY) == 0) {
// we're not in an active state, and this update isn't from a replay, so buffer it.
cmd.setFlags(cmd.getFlags() | UpdateCommand.BUFFERING);
ulog.delete(cmd);
return true;
}
// if we aren't the leader, then we need to check that updates were not re-ordered
if (bucketVersion != 0 && bucketVersion < versionOnUpdate) {
// we're OK... this update has a version higher than anything we've seen
// in this bucket so far, so we know that no reordering has yet occured.
bucket.updateHighest(versionOnUpdate);
} else {
// there have been updates higher than the current update. we need to check
// the specific version for this id.
Long lastVersion = vinfo.lookupVersion(cmd.getIndexedId());
if (lastVersion != null && Math.abs(lastVersion) >= versionOnUpdate) {
// This update is a repeat, or was reordered. We need to drop this update.
return true;
}
}
}
}
doLocalDelete(cmd);
return false;
} // end synchronized (bucket)
} finally {
vinfo.unlockForUpdate();
}
}
private int hash(DeleteUpdateCommand cmd) {
return Hash.murmurhash3_x86_32(cmd.getId(), 0, cmd.getId().length(), 0);
}