Use a threadsafe map in SearchAsyncActionTests #33700
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Today `SearchAsyncActionTests#testFanOutAndCollect` uses a simple `HashMap` for the `nodeToContextMap` variable, which is then accessed from multiple threads without, apparently, explicit synchronisation. This provides an explanation for the test failure identified in elastic#29242 in which `.toString()` returns `"[]"` just before `.isEmpty` returns `false`, without any concurrent modifications. This change converts `nodeToContextMap` to a `newConcurrentMap()` so that this cannot occur. It also fixes a race condition in the detection of double-calling the subsequent search phase. Closes elastic#29242.
DaveCTurner
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colings86
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@DaveCTurner thanks for this. LGTM
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DaveCTurner
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Today `SearchAsyncActionTests#testFanOutAndCollect` uses a simple `HashMap` for the `nodeToContextMap` variable, which is then accessed from multiple threads without, apparently, explicit synchronisation. This provides an explanation for the test failure identified in #29242 in which `.toString()` returns `"[]"` just before `.isEmpty` returns `false`, without any concurrent modifications. This change converts `nodeToContextMap` to a `newConcurrentMap()` so that this cannot occur. It also fixes a race condition in the detection of double-calling the subsequent search phase. Closes #29242.
danielmitterdorfer
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Today `SearchAsyncActionTests#testFanOutAndCollect` uses a simple `HashMap` for the `nodeToContextMap` variable, which is then accessed from multiple threads without, apparently, explicit synchronisation. This provides an explanation for the test failure identified in #29242 in which `.toString()` returns `"[]"` just before `.isEmpty` returns `false`, without any concurrent modifications. This change converts `nodeToContextMap` to a `newConcurrentMap()` so that this cannot occur. It also fixes a race condition in the detection of double-calling the subsequent search phase. This is a backport of #33700 to 5.6. Relates #33700 Relates #29242 Relates #34506
kcm
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Oct 30, 2018
Today `SearchAsyncActionTests#testFanOutAndCollect` uses a simple `HashMap` for the `nodeToContextMap` variable, which is then accessed from multiple threads without, apparently, explicit synchronisation. This provides an explanation for the test failure identified in #29242 in which `.toString()` returns `"[]"` just before `.isEmpty` returns `false`, without any concurrent modifications. This change converts `nodeToContextMap` to a `newConcurrentMap()` so that this cannot occur. It also fixes a race condition in the detection of double-calling the subsequent search phase. Closes #29242.
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Today
SearchAsyncActionTests#testFanOutAndCollectuses a simpleHashMapforthe
nodeToContextMapvariable, which is then accessed from multiple threadswithout, apparently, explicit synchronisation. This provides an explanation for
the test failure identified in #29242 in which
.toString()returns"[]"just before
.isEmptyreturnsfalse, without any concurrent modifications.This change converts
nodeToContextMapto anewConcurrentMap()so that thiscannot occur. It also fixes a race condition in the detection of double-calling
the subsequent search phase.
Closes #29242.