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LUCENE-9662: Update concurrent index checking usage instructions and default thread count to CPU cores (#281)

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zacharymorn 2021-09-09 20:20:42 -07:00 committed by GitHub
parent 42242b1745
commit 7f8607b59e
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1 changed files with 5 additions and 3 deletions
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8
lucene/core/src/java/org/apache/lucene/index/CheckIndex.java
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@ -489,8 +489,7 @@ public final class CheckIndex implements Closeable {
threadCount = tc; threadCount = tc;
} }
// capped threadCount at 4 for default private int threadCount = Runtime.getRuntime().availableProcessors();
private int threadCount = Math.min(Runtime.getRuntime().availableProcessors(), 4);
/** /**
* Set infoStream where messages should go. If null, no messages are printed. If verbose is true * Set infoStream where messages should go. If null, no messages are printed. If verbose is true
@ -3984,7 +3983,7 @@ public final class CheckIndex implements Closeable {
if (opts.indexPath == null) { if (opts.indexPath == null) {
throw new IllegalArgumentException( throw new IllegalArgumentException(
"\nERROR: index path not specified" "\nERROR: index path not specified"
+ "\nUsage: java org.apache.lucene.index.CheckIndex pathToIndex [-exorcise] [-slow] [-segment X] [-segment Y] [-dir-impl X]\n" + "\nUsage: java org.apache.lucene.index.CheckIndex pathToIndex [-exorcise] [-slow] [-segment X] [-segment Y] [-threadCount X] [-dir-impl X]\n"
+ "\n" + "\n"
+ " -exorcise: actually write a new segments_N file, removing any problematic segments\n" + " -exorcise: actually write a new segments_N file, removing any problematic segments\n"
+ " -fast: just verify file checksums, omitting logical integrity checks\n" + " -fast: just verify file checksums, omitting logical integrity checks\n"
@ -3994,6 +3993,9 @@ public final class CheckIndex implements Closeable {
+ " -segment X: only check the specified segments. This can be specified multiple\n" + " -segment X: only check the specified segments. This can be specified multiple\n"
+ " times, to check more than one segment, eg '-segment _2 -segment _a'.\n" + " times, to check more than one segment, eg '-segment _2 -segment _a'.\n"
+ " You can't use this with the -exorcise option\n" + " You can't use this with the -exorcise option\n"
+ " -threadCount X: number of threads used to check index concurrently.\n"
+ " When not specified, this will default to the number of CPU cores.\n"
+ " When '-threadCount 1' is used, index checking will be performed sequentially.\n"
+ " -dir-impl X: use a specific " + " -dir-impl X: use a specific "
+ FSDirectory.class.getSimpleName() + FSDirectory.class.getSimpleName()
+ " implementation. " + " implementation. "